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Prof. Marco Anni
Dipartimento di Matematica e Fisica "Ennio De Giorgi", Università del Salento

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0 Confocal Microscopy
0 Laser
0 Time resolved spectroscopy
0 amplified spontaneous emission
0 perovskite laser

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Short Biography

Marco Anni is Associate Professor of Experimental Physics at the University of Salento, Lecce (Italy). He graduated with a degree in Physics in 1998 and he obtained the title of Philosophy Doctor in Physics in 2001, both from the University of Lecce. From 2006, he has headed the Photonic Laboratory of the Dipartimento di Matematica e Fisica "Ennio De Giorgi". The research activity of the laboratory is focused on the investigation of the optical properties of innovative materials for applications in lasers, sensors and solar cells. He has authored more than 120 publications in international journals, two books and has co-authored four patents.

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Journal article
Published: 01 June 2021 in Nanomaterials
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Lead halide perovskites are emerging as extremely interesting active materials for a wide variety of optoelectronic and photonic devices. A deep understanding of their photophysics is thus fundamental in order to properly understand the origins of the materials active properties and to provide strategies for improving them. In this work, we exploit the local morphological variations in a drop-cast thin CsPbBr3 nanocrystal film to show that the aggregation of NCs has strong effects on the peak wavelengths of PL spectra, the linewidth, and the intensity of dependence on temperature. An analysis based on models that are frequently used in the literature led to completely different conclusions about the intrinsic NC emission properties extracted from spectra measured in points with different contribution of the PL from the aggregates. Our results demonstrate that extreme care has to be used in order to correctly correlate the spectral PL features with the intrinsic emission properties of lead halide perovskite NC films.

ACS Style

Marco Anni; Arianna Cretí; Maria De Giorgi; Mauro Lomascolo. Local Morphology Effects on the Photoluminescence Properties of Thin CsPbBr3 Nanocrystal Films. Nanomaterials 2021, 11, 1470 .

AMA Style

Marco Anni, Arianna Cretí, Maria De Giorgi, Mauro Lomascolo. Local Morphology Effects on the Photoluminescence Properties of Thin CsPbBr3 Nanocrystal Films. Nanomaterials. 2021; 11 (6):1470.

Chicago/Turabian Style

Marco Anni; Arianna Cretí; Maria De Giorgi; Mauro Lomascolo. 2021. "Local Morphology Effects on the Photoluminescence Properties of Thin CsPbBr3 Nanocrystal Films." Nanomaterials 11, no. 6: 1470.

Paper
Published: 19 April 2021 in Nanoscale
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Energy level scheme of multilayered quasi-2D BA3MA3Pb5Br16 films as a function of temperature.

ACS Style

Maria Luisa De Giorgi; Arianna Cretì; Maria-Grazia La-Placa; Pablo P. Boix; Henk J. Bolink; Mauro Lomascolo; Marco Anni. Amplified spontaneous emission in thin films of quasi-2D BA3MA3Pb5Br16 lead halide perovskites. Nanoscale 2021, 13, 8893 -8900.

AMA Style

Maria Luisa De Giorgi, Arianna Cretì, Maria-Grazia La-Placa, Pablo P. Boix, Henk J. Bolink, Mauro Lomascolo, Marco Anni. Amplified spontaneous emission in thin films of quasi-2D BA3MA3Pb5Br16 lead halide perovskites. Nanoscale. 2021; 13 (19):8893-8900.

Chicago/Turabian Style

Maria Luisa De Giorgi; Arianna Cretì; Maria-Grazia La-Placa; Pablo P. Boix; Henk J. Bolink; Mauro Lomascolo; Marco Anni. 2021. "Amplified spontaneous emission in thin films of quasi-2D BA3MA3Pb5Br16 lead halide perovskites." Nanoscale 13, no. 19: 8893-8900.

Editorial
Published: 12 February 2021 in Nanomaterials
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The continuous need to improve the performance of photonic, electronic and optoelectronic devices has stimulated research toward the development of innovative semiconducting materials which display better properties with respect to standard bulk semiconductors

ACS Style

Marco Anni. Special Issue “II-VI Semiconductor Nanocrystals and Hybrid Polymer–Nanocrystal Systems”. Nanomaterials 2021, 11, 467 .

AMA Style

Marco Anni. Special Issue “II-VI Semiconductor Nanocrystals and Hybrid Polymer–Nanocrystal Systems”. Nanomaterials. 2021; 11 (2):467.

Chicago/Turabian Style

Marco Anni. 2021. "Special Issue “II-VI Semiconductor Nanocrystals and Hybrid Polymer–Nanocrystal Systems”." Nanomaterials 11, no. 2: 467.

Review
Published: 29 January 2021 in Molecules
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Lead halide perovskites are currently widely investigated as active materials in photonic and optoelectronic devices. While the lack of long term stability actually limits their application to commercial devices, several experiments demonstrated that beyond the irreversible variation of the material properties due to degradation, several possibilities exist to reversibly modulate the perovskite characteristics by acting on the environmental conditions. These results clear the way to possible applications of lead halide perovskites to resistive and optical sensors. In this review we will describe the current state of the art of the comprehension of the environmental effects on the optical and electronic properties of lead halide perovskites, and of the exploitation of these results for the development of perovskite-based sensors.

ACS Style

Maria De Giorgi; Stefania Milanese; Argyro Klini; Marco Anni. Environment-Induced Reversible Modulation of Optical and Electronic Properties of Lead Halide Perovskites and Possible Applications to Sensor Development: A Review. Molecules 2021, 26, 705 .

AMA Style

Maria De Giorgi, Stefania Milanese, Argyro Klini, Marco Anni. Environment-Induced Reversible Modulation of Optical and Electronic Properties of Lead Halide Perovskites and Possible Applications to Sensor Development: A Review. Molecules. 2021; 26 (3):705.

Chicago/Turabian Style

Maria De Giorgi; Stefania Milanese; Argyro Klini; Marco Anni. 2021. "Environment-Induced Reversible Modulation of Optical and Electronic Properties of Lead Halide Perovskites and Possible Applications to Sensor Development: A Review." Molecules 26, no. 3: 705.

Journal article
Published: 30 June 2020 in Molecules
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Amplified Spontaneous Emission (ASE) threshold represents a crucial parameter often used to establish if a material is a good candidate for applications to lasers. Even if the ASE properties of conjugated polymers have been widely investigated, the specific literature is characterized by several methods to determine the ASE threshold, making comparison among the obtained values impossible. We quantitatively compare 9 different methods employed in literature to determine the ASE threshold, in order to find out the best candidate to determine the most accurate estimate of it. The experiment has been performed on thin films of an homopolymer, a copolymer and a host:guest polymer blend, namely poly(9,9-dioctylfluorene) (PFO), poly(9,9-dioctylfluorene-cobenzothiadiazole) (F8BT) and F8BT:poly(3- hexylthiophene) (F8BT:rrP3HT), applying the Variable Pump Intensity (VPI) and the Variable Stripe Length (VSL) methods. We demonstrate that, among all the spectral features affected by the presence of ASE, the most sensitive is the spectral linewidth and that the best way to estimate the ASE threshold is to determine the excitation density at the beginning of the line narrowing. We also show that the methods most frequently used in literature always overestimate the threshold up to more than one order of magnitude.

ACS Style

Stefania Milanese; Maria Luisa De Giorgi; Marco Anni. Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides. Molecules 2020, 25, 2992 .

AMA Style

Stefania Milanese, Maria Luisa De Giorgi, Marco Anni. Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides. Molecules. 2020; 25 (13):2992.

Chicago/Turabian Style

Stefania Milanese; Maria Luisa De Giorgi; Marco Anni. 2020. "Determination of the Best Empiric Method to Quantify the Amplified Spontaneous Emission Threshold in Polymeric Active Waveguides." Molecules 25, no. 13: 2992.

Research article
Published: 24 April 2020 in The Journal of Physical Chemistry C
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Hybrid halide perovskites have achieved excellent efficiencies and remarkable performances, not just in photovoltaic cells, but also in light-emitting devices, like Light Emitting Diodes, Light Emitting Transistors, and Lasers. The lack of long-term stability is the main limit for the perovskite device commercial applications. While several works investigated the origin of the perovskite degradation for solar cell applications, the operational stability of perovskites under the optical pumping regime to have optical gain and lasing is largely unexplored. In this work, we investigate the origin of the photodegradation of the Amplified Spontaneous Emission (ASE) in MAPbBr3 thin films under nanosecond-UV laser irradiation as a function of the pump excitation density in different environments (air and vacuum). The correlation between the observed ASE operational stability and the irradiation-induced variations of the local morphology and the emission properties allowed us to demonstrate that the main process leading to ASE quenching is related to the film melting induced by localized heating. This also induces a bromine loss. Our results are relevant for the development of suitable strategies to improve the ASE and lasing operational stability of lead halide perovskite films.

ACS Style

Maria Luisa De Giorgi; Titti Lippolis; Nur Fadilah Jamaludin; Cesare Soci; Annalisa Bruno; Marco Anni. Origin of Amplified Spontaneous Emission Degradation in MAPbBr3 Thin Films under Nanosecond-UV Laser Irradiation. The Journal of Physical Chemistry C 2020, 124, 10696 -10704.

AMA Style

Maria Luisa De Giorgi, Titti Lippolis, Nur Fadilah Jamaludin, Cesare Soci, Annalisa Bruno, Marco Anni. Origin of Amplified Spontaneous Emission Degradation in MAPbBr3 Thin Films under Nanosecond-UV Laser Irradiation. The Journal of Physical Chemistry C. 2020; 124 (19):10696-10704.

Chicago/Turabian Style

Maria Luisa De Giorgi; Titti Lippolis; Nur Fadilah Jamaludin; Cesare Soci; Annalisa Bruno; Marco Anni. 2020. "Origin of Amplified Spontaneous Emission Degradation in MAPbBr3 Thin Films under Nanosecond-UV Laser Irradiation." The Journal of Physical Chemistry C 124, no. 19: 10696-10704.

Journal article
Published: 21 March 2020 in Applied Sciences
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In this work, we present a detailed optical investigation of the effects of the environment on the photoluminescence (PL) spectra and the relaxation dynamics of pristine and aged CsPbBr3 nanocrystal (NC) thin films. We demonstrate that, contrary to previous results on similar NCs, the PL intensity of pristine NCs is higher when the sample is in wet air than in vacuum, due to the passivation of defects reducing the free exciton trapping and the bound excitons non-radiative relaxation. The aged NCs show a PL intensity increase in wet air nine times stronger than the pristine ones, due to an interplay between static and dynamic effects, increasing the number of emitting NCs and reducing the non-radiative recombination rate of free excitons. These results improve the understanding of the possible interactions between perovskite NCs and the environment, which could be relevant for the development of optical gas sensors exploiting perovskite NCs.

ACS Style

Marco Anni; Arianna Cretì; Yuhai Zhang; Maria Luisa De Giorgi; Mauro Lomascolo. Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films. Applied Sciences 2020, 10, 2148 .

AMA Style

Marco Anni, Arianna Cretì, Yuhai Zhang, Maria Luisa De Giorgi, Mauro Lomascolo. Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films. Applied Sciences. 2020; 10 (6):2148.

Chicago/Turabian Style

Marco Anni; Arianna Cretì; Yuhai Zhang; Maria Luisa De Giorgi; Mauro Lomascolo. 2020. "Investigation of the Role of the Environment on the Photoluminescence and the Exciton Relaxation of CsPbBr3 Nanocrystals Thin Films." Applied Sciences 10, no. 6: 2148.

Journal article
Published: 24 December 2019 in Molecules
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The development of high performance optically pumped organic lasers operating in the deep blue still remains a big challenge. In this paper, we have investigated the photophysics and the optical gain characteristics of a novel fluorene oligomer functionalized by four triphenylamine (TPA) groups. By ultrafast spectroscopy we found a large gain spectral region from 420 to 500 nm with a maximum gain cross-section of 1.5 × 10-16 cm2 which makes this molecule a good candidate for photonic applications. Amplified Spontaneous Emission measurements (ASE) under 150 fs and 3 ns pump pulses have revealed a narrow emission at 450 nm with a threshold of 5.5 μJcm-2 and 21 μJcm-2 respectively. Our results evidence that this new fluorene molecule is an interesting material for photonic applications, indeed the inclusion of TPA as a lateral substituent leads to a high gain and consequently to a low threshold blue organic ASE.

ACS Style

Tersilla Virgili; Marco Anni; Maria Luisa De Giorgi; Rocio Borrego Varillas; Benedetta M. Squeo; Mariacecilia Pasini. Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film. Molecules 2019, 25, 79 .

AMA Style

Tersilla Virgili, Marco Anni, Maria Luisa De Giorgi, Rocio Borrego Varillas, Benedetta M. Squeo, Mariacecilia Pasini. Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film. Molecules. 2019; 25 (1):79.

Chicago/Turabian Style

Tersilla Virgili; Marco Anni; Maria Luisa De Giorgi; Rocio Borrego Varillas; Benedetta M. Squeo; Mariacecilia Pasini. 2019. "Deep Blue Light Amplification from a Novel Triphenylamine Functionalized Fluorene Thin Film." Molecules 25, no. 1: 79.

Journal article
Published: 29 November 2019 in Scientific Reports
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The use of lead halide perovskites in optoelectronic and photonic devices is mainly limited by insufficient long-term stability of these materials. This issue is receiving growing attention, mainly owing to the operational stability improvement of lead halide perosvkites solar cells. On the contrary, fewer efforts are devoted to the stability improvement of light amplification and lasing. In this report we demonstrate that a simple hydrophobic functionalization of the substrates with hexamethyldisilazane (HMDS) allows to strongly improve the Amplified Spontaneous Emission (ASE) properties of drop cast CsPbBr3 nanocrystal (NC) thin films. In particular we observe an ASE threshold decrease down to 45% of the value without treatment, an optical gain increase of up to 1.5 times and an ASE operational stability increase of up to 14 times. These results are ascribed to a closer NC packing in the films on HMDS treated substrate, allowing an improved energy transfer towards the larger NCs within the NC ensemble, and to the reduction of the film interaction with moisture. Our results propose hydrophobic functionalization of the substrates as an easy approach to lower the ASE and lasing thresholds, while simultaneously increasing the active material stability.

ACS Style

Maria Luisa De Giorgi; Franziska Krieg; Maksym V. Kovalenko; Marco Anni. Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate. Scientific Reports 2019, 9, 1 -10.

AMA Style

Maria Luisa De Giorgi, Franziska Krieg, Maksym V. Kovalenko, Marco Anni. Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate. Scientific Reports. 2019; 9 (1):1-10.

Chicago/Turabian Style

Maria Luisa De Giorgi; Franziska Krieg; Maksym V. Kovalenko; Marco Anni. 2019. "Amplified Spontaneous Emission Threshold Reduction and Operational Stability Improvement in CsPbBr3 Nanocrystals Films by Hydrophobic Functionalization of the Substrate." Scientific Reports 9, no. 1: 1-10.

Research article
Published: 26 November 2019 in ACS Nano
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Semiconductor nanoplatelets (NPLs) have emerged as a very promising class of colloidal nanocrystals for light-emitting devices owing to their quantum-well-like electronic and optical characteristics. However, their lower photoluminescence quantum yield (PLQY) and limited stability have hampered the realization of their outstanding luminescent properties in device applications. Here, to address these deficiencies, we present a two-step synthetic approach that enables the synthesis of core/shell NPLs with precisely controlled shell composition for engineering their excitonic properties. The proposed CdSe colloidal quantum wells possess a graded shell, which is composed of a CdS buffer layer and a CdxZn1-xS gradient layer, and exhibit bright emission (PLQY 75-89%) in the red spectral region (634-648 nm) with a narrow emission linewidth (21 nm). These enhanced optical properties allowed us to attain low thresholds for amplified spontaneous emission (down to ~40 µJ/cm2) under nanosecond laser excitation. We also studied the electroluminescent performance of these NPLs by fabricating solution-processed light emitting devices (LEDs). In comparison to NPL-LEDs with CdSe/CdS core/shell NPLs, which exhibit an external quantum efficiency (EQE) value of only 1.80%, a significantly improved EQE value of 9.92% was obtained using graded-shell NPLs, the highest value for colloidal NPL-based-LEDs. In addition, the low efficiency roll-off characteristics of NPL-LEDs enabled a high brightness of up to ~46000 cd/m2 with an electroluminescence peak centered at 650 nm. These findings demonstrate the paramount role that heterostructure engineering occupies in enhancing the optoelectronic characteristics of semiconductor NPLs towards practically relevant levels.

ACS Style

Yusuf Kelestemur; Yevhen Shynkarenko; Marco Anni; Sergii Yakunin; Maria Luisa De Giorgi; Maksym V. Kovalenko. Colloidal CdSe Quantum Wells with Graded Shell Composition for Low-Threshold Amplified Spontaneous Emission and Highly Efficient Electroluminescence. ACS Nano 2019, 13, 13899 -13909.

AMA Style

Yusuf Kelestemur, Yevhen Shynkarenko, Marco Anni, Sergii Yakunin, Maria Luisa De Giorgi, Maksym V. Kovalenko. Colloidal CdSe Quantum Wells with Graded Shell Composition for Low-Threshold Amplified Spontaneous Emission and Highly Efficient Electroluminescence. ACS Nano. 2019; 13 (12):13899-13909.

Chicago/Turabian Style

Yusuf Kelestemur; Yevhen Shynkarenko; Marco Anni; Sergii Yakunin; Maria Luisa De Giorgi; Maksym V. Kovalenko. 2019. "Colloidal CdSe Quantum Wells with Graded Shell Composition for Low-Threshold Amplified Spontaneous Emission and Highly Efficient Electroluminescence." ACS Nano 13, no. 12: 13899-13909.

Review
Published: 29 October 2019 in Applied Sciences
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Lead halide perovskites are currently receiving increasing attention due to their potential to combine easy active layers fabrication, tunable electronic and optical properties with promising performance of optoelectronic and photonic device prototypes. In this paper, we review the main development steps and the current state of the art of the research on lead halide perovskites amplified spontaneous emission and on optically pumped lasers exploiting them as active materials.

ACS Style

Maria Luisa De Giorgi; Marco Anni. Amplified Spontaneous Emission and Lasing in Lead Halide Perovskites: State of the Art and Perspectives. Applied Sciences 2019, 9, 4591 .

AMA Style

Maria Luisa De Giorgi, Marco Anni. Amplified Spontaneous Emission and Lasing in Lead Halide Perovskites: State of the Art and Perspectives. Applied Sciences. 2019; 9 (21):4591.

Chicago/Turabian Style

Maria Luisa De Giorgi; Marco Anni. 2019. "Amplified Spontaneous Emission and Lasing in Lead Halide Perovskites: State of the Art and Perspectives." Applied Sciences 9, no. 21: 4591.

Review
Published: 19 July 2019 in Nanomaterials
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Hybrid thin films that combine organic conjugated molecules and semiconductors nanocrystals (NCs) have been deeply investigated in the previous years, due to their capability to provide an extremely broad tuning of their electronic and optical properties. In this paper we review the main aspects of the basic physics of the organic–inorganic interaction and the actual state of the art of lasers and light emitting diodes based on hybrid active materials.

ACS Style

Marco Anni. Polymer-II-VI Nanocrystals Blends: Basic Physics and Device Applications to Lasers and LEDs. Nanomaterials 2019, 9, 1036 .

AMA Style

Marco Anni. Polymer-II-VI Nanocrystals Blends: Basic Physics and Device Applications to Lasers and LEDs. Nanomaterials. 2019; 9 (7):1036.

Chicago/Turabian Style

Marco Anni. 2019. "Polymer-II-VI Nanocrystals Blends: Basic Physics and Device Applications to Lasers and LEDs." Nanomaterials 9, no. 7: 1036.

Research article
Published: 08 February 2019 in ACS Applied Materials & Interfaces
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This paper investigates the correlation between the random lasing properties of organic waveguides made by poly-(9-9dioctylfluorene) (PFO) thin films and the morphology of wrinkle corrugated substrates. The capability to individually control the wrinkles wavelength, shape and height allows us to separately investigate their role on the samples emission properties. We demonstrate that the main parameter determining the presence of coherent random lasing is the substrate roughness and that, contrary to what could be qualitatively expected, as the roughness increases coherent random lasing is progressively reduced. Coherent random lasing is observed only for a substrate roughness below 33 nm, while higher roughness leads to Amplified Spontaneous Emission (up to 70 nm) or to absence of light amplification in the film (above 70 nm). We demonstrate that this result is due to a progressive reduction of the light amplification efficiency in the PFO film, evidencing that coherent random lasing can be obtained only with a right interplay between light amplification and scattering. Besides clarifying the basic aspects of random lasing in organic waveguides our work opens the way to the realization of organic random lasing with predictable emission properties, thanks to the high control level of the scattering properties of the wrinkle corrugated surfaces.

ACS Style

Marco Anni; Dongjoon Rhee; Won-Kyu Lee. Random Lasing Engineering in Poly-(9-9dioctylfluorene) Active Waveguides Deposited on Wrinkles Corrugated Surfaces. ACS Applied Materials & Interfaces 2019, 11, 9385 -9393.

AMA Style

Marco Anni, Dongjoon Rhee, Won-Kyu Lee. Random Lasing Engineering in Poly-(9-9dioctylfluorene) Active Waveguides Deposited on Wrinkles Corrugated Surfaces. ACS Applied Materials & Interfaces. 2019; 11 (9):9385-9393.

Chicago/Turabian Style

Marco Anni; Dongjoon Rhee; Won-Kyu Lee. 2019. "Random Lasing Engineering in Poly-(9-9dioctylfluorene) Active Waveguides Deposited on Wrinkles Corrugated Surfaces." ACS Applied Materials & Interfaces 11, no. 9: 9385-9393.

Journal article
Published: 01 January 2019 in Synthetic Metals
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ACS Style

Andrea Perulli; Sandro Lattante; Anna Persano; Adriano Cola; Marco Anni. On the homogeneity of the external quantum efficiency in a free OPV roll-to-roll flexible solar module. Synthetic Metals 2019, 247, 248 -254.

AMA Style

Andrea Perulli, Sandro Lattante, Anna Persano, Adriano Cola, Marco Anni. On the homogeneity of the external quantum efficiency in a free OPV roll-to-roll flexible solar module. Synthetic Metals. 2019; 247 ():248-254.

Chicago/Turabian Style

Andrea Perulli; Sandro Lattante; Anna Persano; Adriano Cola; Marco Anni. 2019. "On the homogeneity of the external quantum efficiency in a free OPV roll-to-roll flexible solar module." Synthetic Metals 247, no. : 248-254.

Journal article
Published: 23 April 2018 in Applied Physics Letters
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ACS Style

A. Perulli; Antonio Balena; M. Fernandez; G. Nedelcu; A. Cretí; M. V. Kovalenko; M. Lomascolo; M. Anni. Full-color tuning in binary polymer:perovskite nanocrystals organic-inorganic hybrid blends. Applied Physics Letters 2018, 112, 171904 .

AMA Style

A. Perulli, Antonio Balena, M. Fernandez, G. Nedelcu, A. Cretí, M. V. Kovalenko, M. Lomascolo, M. Anni. Full-color tuning in binary polymer:perovskite nanocrystals organic-inorganic hybrid blends. Applied Physics Letters. 2018; 112 (17):171904.

Chicago/Turabian Style

A. Perulli; Antonio Balena; M. Fernandez; G. Nedelcu; A. Cretí; M. V. Kovalenko; M. Lomascolo; M. Anni. 2018. "Full-color tuning in binary polymer:perovskite nanocrystals organic-inorganic hybrid blends." Applied Physics Letters 112, no. 17: 171904.

Research article
Published: 20 February 2018 in The Journal of Physical Chemistry C
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Cesius lead halide perovskite colloidal nanocrystals are among the most promising perovskite systems for light emitting devices applications, due to their high fluorescence quantum yield and high optical gain at room temperature. In this Letter, we report on the first investigation of the temperature dependence of the Amplified Spontaneous Emission (ASE) properties of thin films of $\rm CsPbBr_3$ nanocrystals. We demonstrate that ASE is strongly temperature dependent, with a complex variation in temperature of the ASE intensity, threshold, and peak wavelength. The joint investigation of the photoluminescence (PL) spectra below and above the ASE threshold allows us to conclude that the temperature increase results in the formation of disordered sub-domains emitting in the low energy tail of the PL spectra, leading to the existence of three emission regimes with transitions at about 90 K and about 170 K, with individually different temperature dependences.

ACS Style

Antonio Balena; Andrea Perulli; Manuel Fernandez; Maria Luisa De Giorgi; Georgian Nedelcu; Maksym V. Kovalenko; Marco Anni. Temperature Dependence of the Amplified Spontaneous Emission from CsPbBr3 Nanocrystal Thin Films. The Journal of Physical Chemistry C 2018, 122, 5813 -5819.

AMA Style

Antonio Balena, Andrea Perulli, Manuel Fernandez, Maria Luisa De Giorgi, Georgian Nedelcu, Maksym V. Kovalenko, Marco Anni. Temperature Dependence of the Amplified Spontaneous Emission from CsPbBr3 Nanocrystal Thin Films. The Journal of Physical Chemistry C. 2018; 122 (10):5813-5819.

Chicago/Turabian Style

Antonio Balena; Andrea Perulli; Manuel Fernandez; Maria Luisa De Giorgi; Georgian Nedelcu; Maksym V. Kovalenko; Marco Anni. 2018. "Temperature Dependence of the Amplified Spontaneous Emission from CsPbBr3 Nanocrystal Thin Films." The Journal of Physical Chemistry C 122, no. 10: 5813-5819.

Journal article
Published: 01 October 2017 in Optical Materials
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ACS Style

Sandro Lattante; Maria Luisa De Giorgi; Mariacecilia Pasini; Marco Anni. Low threshold Amplified Spontaneous Emission properties in deep blue of poly[(9,9-dioctylfluorene-2,7-dyil)-alt-p-phenylene] thin films. Optical Materials 2017, 72, 765 -768.

AMA Style

Sandro Lattante, Maria Luisa De Giorgi, Mariacecilia Pasini, Marco Anni. Low threshold Amplified Spontaneous Emission properties in deep blue of poly[(9,9-dioctylfluorene-2,7-dyil)-alt-p-phenylene] thin films. Optical Materials. 2017; 72 ():765-768.

Chicago/Turabian Style

Sandro Lattante; Maria Luisa De Giorgi; Mariacecilia Pasini; Marco Anni. 2017. "Low threshold Amplified Spontaneous Emission properties in deep blue of poly[(9,9-dioctylfluorene-2,7-dyil)-alt-p-phenylene] thin films." Optical Materials 72, no. : 765-768.

Research article
Published: 29 June 2017 in The Journal of Physical Chemistry C
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Metal halide perovskites are currently emerging as highly promising optoelectronic materials. It has been recently demonstrated that fully inorganic solution processed CsPbBr3 perovskite thin films show good electroluminescence properties combined with high thermal stability. In this work, we investigate in details the amplified spontaneous emission (ASE) properties of CsPbBr3 perovskite thin films, as a function of the temperature and the trap density, modified by changing the CsBr–PbBr2 precursor concentration. ASE is observed in samples from both CsBr-rich solution (low trap density) and equimolar solution (higher trap density), up to about 150 K, with a minimum threshold of 26 and 29 μJ cm–2 at 10 K, respectively. However, the different distribution of defect states, mainly above the first exciton level in the former and below it in the latter, strongly improved optical gain at 10 K and changed the ASE temperature dependence of CsBr-rich films.

ACS Style

M. Luisa De Giorgi; Andrea Perulli; Natalia Yantara; Pablo P. Boix; Marco Anni. Amplified Spontaneous Emission Properties of Solution Processed CsPbBr3 Perovskite Thin Films. The Journal of Physical Chemistry C 2017, 121, 14772 -14778.

AMA Style

M. Luisa De Giorgi, Andrea Perulli, Natalia Yantara, Pablo P. Boix, Marco Anni. Amplified Spontaneous Emission Properties of Solution Processed CsPbBr3 Perovskite Thin Films. The Journal of Physical Chemistry C. 2017; 121 (27):14772-14778.

Chicago/Turabian Style

M. Luisa De Giorgi; Andrea Perulli; Natalia Yantara; Pablo P. Boix; Marco Anni. 2017. "Amplified Spontaneous Emission Properties of Solution Processed CsPbBr3 Perovskite Thin Films." The Journal of Physical Chemistry C 121, no. 27: 14772-14778.

Journal article
Published: 01 March 2016 in Thin Solid Films
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In this work, yttrium (Y) thin films have been deposited on Si (100) substrates by the pulsed laser deposition technique. Ex-situ morphological, structural and optical characterisations of such films have been performed by scanning electron microscopy, X-ray diffractometry, atomic force microscopy and ellipsometry. Polycrystalline films with a thickness of 1.2 μm, homogenous with a root mean square roughness of about 2 nm, were obtained by optimised laser irradiation conditions. Despite the relatively high thickness, the films resulted very adherent to the substrates. The high quality of such thin films is important to the synthesis of metallic photocathodes based on Y thin film, which could be used as electron sources of high photoemission performance in radio-frequency guns.

ACS Style

A. Lorusso; Marco Anni; A.P. Caricato; F. Gontad; A. Perulli; Antonietta Taurino; A. Perrone; Enrica Chiadroni. Deposition of Y thin films by nanosecond UV pulsed laser ablation for photocathode application. Thin Solid Films 2016, 603, 441 -445.

AMA Style

A. Lorusso, Marco Anni, A.P. Caricato, F. Gontad, A. Perulli, Antonietta Taurino, A. Perrone, Enrica Chiadroni. Deposition of Y thin films by nanosecond UV pulsed laser ablation for photocathode application. Thin Solid Films. 2016; 603 ():441-445.

Chicago/Turabian Style

A. Lorusso; Marco Anni; A.P. Caricato; F. Gontad; A. Perulli; Antonietta Taurino; A. Perrone; Enrica Chiadroni. 2016. "Deposition of Y thin films by nanosecond UV pulsed laser ablation for photocathode application." Thin Solid Films 603, no. : 441-445.

Journal article
Published: 01 February 2016 in Organic Electronics
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We investigate the Amplified Spontaneous Emission (ASE) properties of a prototypical host-guest polymer polymer blend, namely poly(9,9-dioctylfluorene) (PF8) and poly(9,9-dioctylfluorene-co-benzothiadiazole) (F8BT) blend, with different concentration ratio. We show that the initial F8BT content increase causes an increase of the F8BT ASE threshold, even leading to ASE suppression for F8BT contents between 25% and 75%. ASE is then recovered upon further increase of the F8BT relative content. We demonstrate that the ASE properties of the PF8:F8BT are dominated by morphology effects, like submicrometric phase segregation, determining the net gain of the active waveguides.

ACS Style

Sandro Lattante; Arianna Cretí; Mauro Lomascolo; Marco Anni. On the correlation between morphology and Amplified Spontaneous Emission properties of a polymer: Polymer blend. Organic Electronics 2016, 29, 44 -49.

AMA Style

Sandro Lattante, Arianna Cretí, Mauro Lomascolo, Marco Anni. On the correlation between morphology and Amplified Spontaneous Emission properties of a polymer: Polymer blend. Organic Electronics. 2016; 29 ():44-49.

Chicago/Turabian Style

Sandro Lattante; Arianna Cretí; Mauro Lomascolo; Marco Anni. 2016. "On the correlation between morphology and Amplified Spontaneous Emission properties of a polymer: Polymer blend." Organic Electronics 29, no. : 44-49.