Prof. Dr. Przemyslaw Data

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17Years (2010-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

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18 July 2016 in Advanced Science

Journal Article

The Role of Local Triplet Excited States and D‐A Relative Orientation in Thermally Activated Delayed Fluorescence: Photophysics and Devices

Fernando B. Dias

Jose Santos

David R. Graves

Przemyslaw Data

Roberto Shigueru Nobuyasu Jr

Andrew P. Monkman

Here, a comprehensive photophysical investigation of a the emitter molecule DPTZ‐DBTO2, showing thermally activated delayed fluorescence (TADF), with near‐orthogonal electron donor (D) and acceptor (A) units is reported. It is shown that DPTZ‐DBTO2 has minimal singlet–triplet energy splitting due to its near‐rigid molecular geometry. However, the electronic coupling between the local triplet (³LE) and the charge transfer states, singlet and triplet, (¹CT, ³CT), and the effect of dynamic rocking of the D–A units about the orthogonal geometry are crucial for efficient TADF to be achieved. In solvents with low polarity, the guest emissive singlet ¹CT state couples directly to the near‐degenerate ³LE, efficiently harvesting the triplet states by a spin orbit coupling charge transfer mechanism (SOCT). However, in solvents with higher polarity the emissive CT state in DPTZ‐DBTO2 shifts below (the static) ³LE, leading to decreased TADF efficiencies. The relatively large energy difference between the ¹CT and ³LE states and the extremely low efficiency of the ¹CT to ³CT hyperfine coupling is responsible for the reduction in TADF efficiency. Both the electronic coupling between ¹CT and ³LE, and the (dynamic) orientation of the D–A units are thus critical elements that dictate reverse intersystem crossing processes and thus high efficiency in TADF.

11 January 2017 in Chemical Science

Journal Article

Thermally activated delayed fluorescent phenothiazine–dibenzo[a,j]phenazine–phenothiazine triads exhibiting tricolor-changing mechanochromic luminescence

Masato Okazaki

Heather Higginbotham

Novel U-shaped donor–acceptor–donor (D–A–D) π-conjugated multi-functional molecules comprising dibenzo[a,j]phenazine (DBPHZ) as an acceptor and phenothiazines (PTZ) as donors have been developed. Most importantly, the D–A–D compounds exhibit not only distinct tricolor-changeable mechanochromic luminescence (MCL) properties but also efficient thermally activated delayed fluorescence (TADF). Quantum chemical calculations, X-ray diffraction analysis, and systematic studies on the photophysical properties indicated that the “two-conformation-switchable” PTZ units play a highly important role in achieving multi-color-changing MCL. Time-resolved photophysical measurements revealed that the developed D–A–D compounds also exhibit efficient orange-TADF. Furthermore, organic light-emitting diode (OLED) devices fabricated with the new TADF emitters have achieved high external quantum efficiencies (EQEs) up to 16.8%, which significantly exceeds the theoretical maximum (∼5%) of conventional fluorescent emitters.

6 April 2016 in Angewandte Chemie International Edition

Journal Article

Dibenzo[a,j]phenazine‐Cored Donor–Acceptor–Donor Compounds as Green‐to‐Red/NIR Thermally Activated Delayed Fluorescence Organic Light Emitters

Masato Okazaki

Satoshi Minakata

8 August 2014 in Advanced Functional Materials

Journal Article

Highly Efficient TADF OLEDs: How the Emitter–Host Interaction Controls Both the Excited State Species and Electrical Properties of the Devices to Achieve Near 100% Triplet Harvesting and High Efficiency

Vygintas Jankus

Przemyslaw Data

David Graves

Callum McGuinness

Jose Santos

Andrew P. Monkman

13 April 2017 in Nature Communications

Journal Article

Regio- and conformational isomerization critical to design of efficient thermally-activated delayed fluorescence emitters

Marc K. Etherington

Flavio Franchello

Jamie Gibson

Thomas Northey

Jose Santos

Andrew P. Monkman

+10

Regio- and conformational isomerization are fundamental in chemistry, with profound effects upon physical properties, however their role in excited state properties is less developed. Here two regioisomers of bis(10H-phenothiazin-10-yl)dibenzo[b,d]thiophene-S,S-dioxide, a donor–acceptor–donor (D–A–D) thermally-activated delayed fluorescence (TADF) emitter, are studied. 2,8-bis(10H-phenothiazin-10-yl)dibenzo[b,d]thiophene-S,S-dioxide exhibits only one quasi-equatorial conformer on both donor sites, with charge-transfer (CT) emission close to the local triplet state leading to efficient TADF via spin-vibronic coupling. However, 3,7-bis(10H-phenothiazin-10-yl)dibenzo[b,d]thiophene-S,S-dioxide displays both a quasi-equatorial CT state and a higher-energy quasi-axial CT state. No TADF is observed in the quasi-axial CT emission. These two CT states link directly to the two folded conformers of phenothiazine. The presence of the low-lying local triplet state of the axial conformer also means that this quasi-axial CT is an effective loss pathway both photophysically and in devices. Importantly, donors or acceptors with more than one conformer have negative repercussions for TADF in organic light-emitting diodes.

12 January 2016 in Advanced Optical Materials

Journal Article

Rational Design of TADF Polymers Using a Donor–Acceptor Monomer with Enhanced TADF Efficiency Induced by the Energy Alignment of Charge Transfer and Local Triplet Excited States

Roberto Shigueru Nobuyasu Jr

Zhongjie Ren

Gareth C. Griffiths

Andrei S. Batsanov

Przemyslaw Data

Fernando B. Dias

About Me

Przemyslaw Data is currently Professor of Chemistry at the Silesian University of Technology (Poland). He finished his Ph.D. with honors in Chemistry (2013) at the Silesian University of Technology in Poland and received the Polish Prime Ministry Award for Outstanding Doctoral Dissertation. After completing his Ph.D., Prof. Data received a 2-year postdoctoral fellowship to work at Durham University on using exciplexes as thermally activated delayed fluorescence (TADF) emitters in organic light-emitting diodes (OLEDs); he also received an H2020 Marie Sklodowska-Curie Individual Fellowship to extend his work at Durham University on CT-based TADF materials for the next two years. After the fellowship, he was appointed as an experienced researcher at Durham University; jointly with the Silesian University of Technology, he followed the work on topics related to organic electronics. Prof. Przemyslaw Data is a member of the International Society of Electrochemistry and the Royal Society of Chemistry. Furthermore, Prof. Data is a winner of many Polish awards and international awards such as the MIT Innovator Under 35 (2017 Polish Edition) award and MSCA Individual Fellowship. In addition, he is a coordinator of many Polish- (National Science Centre, Ministry of Science and Higher Education, Foundation for Polish Science) and European- (FP7, H2020) funded grants such as the MSCA Innovative Training Network (EXCILIGHT), TWINN (ORZEL), MSCA RISE (OCTA), and ERA-Chair (ExCEED).

Prof. Dr. Przemyslaw Data

Prof. Dr. Przemyslaw Data

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