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Neha Khotele; N. N.Thejo Kalyani; Ramchandra Pode; S.J. Dhoble. Appraisal of Structural, Thermal, and Optical Properties of Novel Bluish-Violet Light-Emitting Cyclometallated Iridium (III) (Cl-H-DPQ)2Ir(acac) Complex for OLED Devices. ECS Journal of Solid State Science and Technology 2021, 1 .
AMA StyleNeha Khotele, N. N.Thejo Kalyani, Ramchandra Pode, S.J. Dhoble. Appraisal of Structural, Thermal, and Optical Properties of Novel Bluish-Violet Light-Emitting Cyclometallated Iridium (III) (Cl-H-DPQ)2Ir(acac) Complex for OLED Devices. ECS Journal of Solid State Science and Technology. 2021; ():1.
Chicago/Turabian StyleNeha Khotele; N. N.Thejo Kalyani; Ramchandra Pode; S.J. Dhoble. 2021. "Appraisal of Structural, Thermal, and Optical Properties of Novel Bluish-Violet Light-Emitting Cyclometallated Iridium (III) (Cl-H-DPQ)2Ir(acac) Complex for OLED Devices." ECS Journal of Solid State Science and Technology , no. : 1.
This paper presents an efficient and stable green inverted organic light emitting diode (IOLED) using multifunctional and strong nucleophilic quality electron transport material (1,3-bis(2-phenyl-1,10-phenanthrolin-4-yl)benzene (m-bPPhenB)) with silver (Ag) as an n-dopant. By the energy level alignment study using in-situ ultraviolet photoelectron spectroscopy measurement, negligible electron injection barrier between indium tin oxide (ITO) and Ag-doped m-bPPhenB (Φe ≈ 0.03 eV) is observed and the electrons can be easily tunneled from ITO into Ag-doped m-bPPhenB layer. Also, Ag dopant forms coordination bonds with phenanthroline based unit, which improves electron injection from ITO. Fabricated IOLED devices using an Ag-doped m-bPPhenB have an extremely low driving voltage of 3.6 V and external quantum efficiency of 29.0%. Such good performances of IOLED are attributed to negligible electron injection barrier at the interface between ITO and Ag-doped m-bPPhenB. The Ag-doped IOLED device also shows a good air stability owing to the stable Ag n-dopant. The doping of Ag into special electron transport layer in the IOLED structure could be applicable to various displays and lighting applications.
Hye In Yang; Seung Hye Jeong; Sang Min Cho; Raju Lampande; Kyu-Myung Lee; Jong-Am Hong; Ji-Woong Choi; Beom-Su Kim; Yongsup Park; Ramchandra Pode; Jang Hyuk Kwon. Efficient cathode contacts through Ag-doping in multifunctional strong nucleophilic electron transport layer for high performance inverted OLEDs. Organic Electronics 2020, 89, 106031 .
AMA StyleHye In Yang, Seung Hye Jeong, Sang Min Cho, Raju Lampande, Kyu-Myung Lee, Jong-Am Hong, Ji-Woong Choi, Beom-Su Kim, Yongsup Park, Ramchandra Pode, Jang Hyuk Kwon. Efficient cathode contacts through Ag-doping in multifunctional strong nucleophilic electron transport layer for high performance inverted OLEDs. Organic Electronics. 2020; 89 ():106031.
Chicago/Turabian StyleHye In Yang; Seung Hye Jeong; Sang Min Cho; Raju Lampande; Kyu-Myung Lee; Jong-Am Hong; Ji-Woong Choi; Beom-Su Kim; Yongsup Park; Ramchandra Pode; Jang Hyuk Kwon. 2020. "Efficient cathode contacts through Ag-doping in multifunctional strong nucleophilic electron transport layer for high performance inverted OLEDs." Organic Electronics 89, no. : 106031.
Electricity consumption for lighting is over 15% world's total electricity, thereby contributing to the 5% of worldwide greenhouse gas emissions. By 2030, a 50% rise in lighting demand of the existing consumption is projected due to an increase in the global population. To address the concern of rising lighting electricity consumption, the key strategy is to develop and provide energy efficient lighting products to consumers. In this respect, the Solid-State Lighting (SSL) has the potential to offer power efficiencies that are superior to those of conventional lighting sources. Recently, white organic light emitting devices (OLEDs) have emerged as the leading technology for the new display and lighting market which has attracted substantial attention of manufacturers, product designers, and end users. OLED devices have already entered into high end lighting markets such as designer, automotive, aerospace, high-end architectural lighting, and other applications. Moreover, innovative flexible OLED devices are thought to be candidates for the next-generation SSL systems, wearable electronics, mobile devices, microdisplays, etc. as they are lighter, thinner and more durable compared to glass (rigid) based devices. In the present review, distinctive features of OLEDs SSL lighting, technical requirements of lighting for applications, OLED basic, and classification of OLED devices, including quantum dot (QD) OLEDs (QLED) as well as the need of development of OLEDs standards are discussed. Various constituents of flexible OLED lighting, OLED lighting panels by some manufacturers, hurdles in OLED lighting technologies, performance of OLEDs in harsh conditions, challenges in flexible OLEDs, OLED lighting technology comparison, OLED lighting roadmap, and future directions including cost reduction analysis, flexible OLED incorporated into automotive, IoT (Internet of Things) connected lighting system, OLED market projections, etc. are also presented. It is suggested that the white OLEDs, and flexible OLEDs in particular, lighting products have potential to revolutionize the future of lighting systems, industries, and the market.
Ramchandra Pode. Organic light emitting diode devices: An energy efficient solid state lighting for applications. Renewable and Sustainable Energy Reviews 2020, 133, 110043 .
AMA StyleRamchandra Pode. Organic light emitting diode devices: An energy efficient solid state lighting for applications. Renewable and Sustainable Energy Reviews. 2020; 133 ():110043.
Chicago/Turabian StyleRamchandra Pode. 2020. "Organic light emitting diode devices: An energy efficient solid state lighting for applications." Renewable and Sustainable Energy Reviews 133, no. : 110043.
Here, we report a highly reliable and transparent cathode (TC) for transparent organic light emitting diode (TOLED) applications. The cathode layer is fabricated by co-deposition of silver (Ag) and aluminum (Al) metals using thermal evaporation. The atomic percentages of Al and Ag are fixed at 96 at% and 4 at%, respectively. TC shows transmittance at 520 nm ([email protected]) of 83.5% and sheet resistance as low as 7.0 Ω/□. Almost no specific agglomeration of Ag:Al (4%, 14 nm) is noticed by the thermal annealing of fabricated cathode at 85 °C, 240 h. The fabricated TOLED with this Ag:Al (4%, 14 nm) cathode shows an excellent electron injection property with a [email protected] of 83.5%, and achieved current efficiencies of 36 and 18 cd/A from bottom and top sides emissions, respectively. It is argued that the Al-doped Ag film could become an effective, feasible alternative to the existing transparent conducting electrode for TOLED applications.
Min-Geun Song; Kwan-Soo Kim; Hye In Yang; Seong Keun Kim; Jae-Hyun Kim; Chang-Wook Han; Hyun-Chul Choi; Ramchandra Pode; Jang Hyuk Kwon. Highly reliable and transparent Al doped Ag cathode fabricated using thermal evaporation for transparent OLED applications. Organic Electronics 2019, 76, 105418 .
AMA StyleMin-Geun Song, Kwan-Soo Kim, Hye In Yang, Seong Keun Kim, Jae-Hyun Kim, Chang-Wook Han, Hyun-Chul Choi, Ramchandra Pode, Jang Hyuk Kwon. Highly reliable and transparent Al doped Ag cathode fabricated using thermal evaporation for transparent OLED applications. Organic Electronics. 2019; 76 ():105418.
Chicago/Turabian StyleMin-Geun Song; Kwan-Soo Kim; Hye In Yang; Seong Keun Kim; Jae-Hyun Kim; Chang-Wook Han; Hyun-Chul Choi; Ramchandra Pode; Jang Hyuk Kwon. 2019. "Highly reliable and transparent Al doped Ag cathode fabricated using thermal evaporation for transparent OLED applications." Organic Electronics 76, no. : 105418.
In OLED displays, pixel shrinkage due to the operating/storage temperature and aging of the devices is causing serious concern. Here, we report an influence of thermally treated Mg:Ag-based thin-film cathode on the OLED pixel shrinkage. The SEM results show significantly pronounced Ag islands formation in only Ag (16 nm) film, annealed at 100 °C for 24 h. On the other hand, a very clean and continuous film is noticed in the Mg:Ag (5:1, 16 nm) cathode before and after the thermal treatments. To address the shrinkage concern, Mg:Ag (10:1, 16 nm), Mg:Ag (1:10, 16 nm), LiF (1 nm)/Mg:Ag (1:10, 16 nm), and Mg:LiF (1:1, 2 nm)/Mg:Ag (1:10, 16 nm) cathodes are fabricated and stored at 85 °C for 240 h. In the Mg:Ag (10:1, 16nm) film, the optical microscope and SEM images reveal the smooth and continuous film. In contrast, the Mg:Ag (1:10, 16 nm) thin film shows islands formation. The surface morphology is significantly improved in the LiF (1 nm)/Mg:Ag (1:10, 16 nm) cathode. Furthermore, a very clean and continuous film is observed when the Mg:Ag (1:10, 16 nm) cathode is deposited on the Mg:LiF (1:1, 2 nm) film. The phosphorescent red TEOLED fabricated using the Mg:LiF (1:1, 2 nm)/Mg:Ag (1:10, 16 nm) cathode shows improved operational performances.
Sun-Kap Kwon; Ji-Ho Baek; Hyun-Chul Choi; In-Byoung Kang; Seong Keun Kim; Ramchandra Pode; Jang Hyuk Kwon. OLED Pixel Shrinkage Dependence with Cathode Influenced by Thermal Effect. IEEE Electron Device Letters 2018, 39, 1 -1.
AMA StyleSun-Kap Kwon, Ji-Ho Baek, Hyun-Chul Choi, In-Byoung Kang, Seong Keun Kim, Ramchandra Pode, Jang Hyuk Kwon. OLED Pixel Shrinkage Dependence with Cathode Influenced by Thermal Effect. IEEE Electron Device Letters. 2018; 39 (10):1-1.
Chicago/Turabian StyleSun-Kap Kwon; Ji-Ho Baek; Hyun-Chul Choi; In-Byoung Kang; Seong Keun Kim; Ramchandra Pode; Jang Hyuk Kwon. 2018. "OLED Pixel Shrinkage Dependence with Cathode Influenced by Thermal Effect." IEEE Electron Device Letters 39, no. 10: 1-1.
Transparent organic light emitting diodes (TOLED) have widespread applications in the next-generation display devices particularly in the large size transparent window and interactive displays. Herein, we report high performance and stable attractive smart window displays using facile process. Advanced smart window display is realized by integrating the high performance light blocking screen and highly transparent white OLED panel. The full smart window display reveals a maximum transmittance as high as 64.2% at the wavelength of 600 nm and extremely good along with tunable ambient contrast ratio (171.94:1) compared to that of normal TOLED (4.54:1). Furthermore, the performance decisive light blocking screen has demonstrated an excellent optical and electrical characteristics such as i) high transmittance (85.56% at 562nm) at light-penetrating state, ii) superior absorbance (2.30 at 562nm) in light interrupting mode, iii) high optical contrast (85.50 at 562 nm), iv) high optical stability for more than 25,000 cycle of driving, v) fast switching time of 1.9 sec, and vi) low driving voltage of 1.7 V. The experimental results of smart window display are also validated using optical simulation. The proposed smart window display technology allows us to adjust the intensity of daylight entering the system quickly and conveniently.
Gyeong Woo Kim; Raju Lampande; Dong Cheol Choe; Ik Jang Ko; Jin Hwan Park; Ramchandra Pode; Jang Hyuk Kwon. Next generation smart window display using transparent organic display and light blocking screen. Optics Express 2018, 26, 8493 -8502.
AMA StyleGyeong Woo Kim, Raju Lampande, Dong Cheol Choe, Ik Jang Ko, Jin Hwan Park, Ramchandra Pode, Jang Hyuk Kwon. Next generation smart window display using transparent organic display and light blocking screen. Optics Express. 2018; 26 (7):8493-8502.
Chicago/Turabian StyleGyeong Woo Kim; Raju Lampande; Dong Cheol Choe; Ik Jang Ko; Jin Hwan Park; Ramchandra Pode; Jang Hyuk Kwon. 2018. "Next generation smart window display using transparent organic display and light blocking screen." Optics Express 26, no. 7: 8493-8502.
Mi Jin Park; Seong Keun Kim; Ramchandra Pode; Jang Hyuk Kwon. Low absorption semi-transparent cathode for micro-cavity top-emitting organic light emitting diodes. Organic Electronics 2018, 52, 153 -158.
AMA StyleMi Jin Park, Seong Keun Kim, Ramchandra Pode, Jang Hyuk Kwon. Low absorption semi-transparent cathode for micro-cavity top-emitting organic light emitting diodes. Organic Electronics. 2018; 52 ():153-158.
Chicago/Turabian StyleMi Jin Park; Seong Keun Kim; Ramchandra Pode; Jang Hyuk Kwon. 2018. "Low absorption semi-transparent cathode for micro-cavity top-emitting organic light emitting diodes." Organic Electronics 52, no. : 153-158.
About 70% population of Myanmar lives in rural areas where average electrification rate is mere 16%. Out of total 64,917 villages, about 57,557 villages are in remote areas, far away from the national grid. Myanmar is blessed with an abundance of energy potential and extensive renewable resources, including large amount of agricultural biomass waste. The rice husk is one of the major sources of biomass. The paddy rice production had been estimated at 28.9 million tons for 2014, producing 5.78 million tons of rice husks. Over 1000 rice mills across Myanmar are being powered by rice husk small scale biomass gasifiers. After 2001, few rice husk biomass power plant were installed by rural cooperatives/committees for rural electrification. The present investigation focuses to explore the self-sustaining energy service model to provide grid quality power to rural populations without the need of subsidies. The power system model focusing on both power requirements for the productive use and the neighboring villages/rural households at affordable tariff could become the most appropriate solution for the sustainable rural electrification. It is argued that the rice husk biomass power system installed and operated by rice millers is not only the sustainable and affordable option to rural electrification but also the financially viable business model to provide the grid quality power to rural population without grant or subsidy. Furthermore, the modern energy policy objectives-energy security, affordability, and sustainability are also met with the biomass rice husk power plant.
Ramchandra Pode; Gayatri Pode; Boucar Diouf. Solution to sustainable rural electrification in Myanmar. Renewable and Sustainable Energy Reviews 2016, 59, 107 -118.
AMA StyleRamchandra Pode, Gayatri Pode, Boucar Diouf. Solution to sustainable rural electrification in Myanmar. Renewable and Sustainable Energy Reviews. 2016; 59 ():107-118.
Chicago/Turabian StyleRamchandra Pode; Gayatri Pode; Boucar Diouf. 2016. "Solution to sustainable rural electrification in Myanmar." Renewable and Sustainable Energy Reviews 59, no. : 107-118.
Mi Jin Park; Young Hoon Son; Gyeong Heon Kim; Raju Lampande; Hyeong Woo Bae; Ramchandra Pode; Yoon Kyoo Lee; Won Jun Song; Jang Hyuk Kwon. Device performances of third order micro-cavity green top-emitting organic light emitting diodes. Organic Electronics 2015, 26, 458 -463.
AMA StyleMi Jin Park, Young Hoon Son, Gyeong Heon Kim, Raju Lampande, Hyeong Woo Bae, Ramchandra Pode, Yoon Kyoo Lee, Won Jun Song, Jang Hyuk Kwon. Device performances of third order micro-cavity green top-emitting organic light emitting diodes. Organic Electronics. 2015; 26 ():458-463.
Chicago/Turabian StyleMi Jin Park; Young Hoon Son; Gyeong Heon Kim; Raju Lampande; Hyeong Woo Bae; Ramchandra Pode; Yoon Kyoo Lee; Won Jun Song; Jang Hyuk Kwon. 2015. "Device performances of third order micro-cavity green top-emitting organic light emitting diodes." Organic Electronics 26, no. : 458-463.
Boucar Diouf; Ramchandra Pode; Rita Osei. Recycling mobile phone batteries for lighting. Renewable Energy 2015, 78, 509 -515.
AMA StyleBoucar Diouf, Ramchandra Pode, Rita Osei. Recycling mobile phone batteries for lighting. Renewable Energy. 2015; 78 ():509-515.
Chicago/Turabian StyleBoucar Diouf; Ramchandra Pode; Rita Osei. 2015. "Recycling mobile phone batteries for lighting." Renewable Energy 78, no. : 509-515.
Boucar Diouf; Ramchandra Pode. Potential of lithium-ion batteries in renewable energy. Renewable Energy 2015, 76, 375 -380.
AMA StyleBoucar Diouf, Ramchandra Pode. Potential of lithium-ion batteries in renewable energy. Renewable Energy. 2015; 76 ():375-380.
Chicago/Turabian StyleBoucar Diouf; Ramchandra Pode. 2015. "Potential of lithium-ion batteries in renewable energy." Renewable Energy 76, no. : 375-380.
Ramchandra Pode; Boucar Diouf; Gayatri Pode. Sustainable rural electrification using rice husk biomass energy: A case study of Cambodia. Renewable and Sustainable Energy Reviews 2015, 44, 530 -542.
AMA StyleRamchandra Pode, Boucar Diouf, Gayatri Pode. Sustainable rural electrification using rice husk biomass energy: A case study of Cambodia. Renewable and Sustainable Energy Reviews. 2015; 44 ():530-542.
Chicago/Turabian StyleRamchandra Pode; Boucar Diouf; Gayatri Pode. 2015. "Sustainable rural electrification using rice husk biomass energy: A case study of Cambodia." Renewable and Sustainable Energy Reviews 44, no. : 530-542.
This paper investigate the effectiveness of non-conjugated polymer polyvinylpyrrolidone (PVP) at the interface of an n-type metal oxide buffer layer and the photoactive layer in inverted bulk heterojunction solar cells. A 15% enhancement in power conversion efficiency (PCE) is realized after the incorporation of a thin PVP layer between zinc oxide (ZnO) and polythieno[3,4-b]-thiophene-co-benzodithiophene (PTB7):[6,6]-phenyl C71-butyric acid methyl ester (PC70BM) based photoactive layer in inverted polymer solar cells. The fabricated devices with the PVP layer show enhanced PCE as high as 7.30% under simulated AM 1.5 G (100 mW cm−2) illumination. The ZnO/PVP improves the electron extraction property of the ITO electrode, effectively blocks holes from the highest occupied molecular orbital of the donor, suppresses charge recombination at the interface of ZnO and the photoactive layer, and decreases the interfacial contact resistance.
Raju Lampande; Gyeong Woo Kim; Ramchandra Pode; Jang Hyuk Kwon. Effectiveness of a polyvinylpyrrolidone interlayer on a zinc oxide film for interfacial modification in inverted polymer solar cells. RSC Advances 2014, 4, 49855 -49860.
AMA StyleRaju Lampande, Gyeong Woo Kim, Ramchandra Pode, Jang Hyuk Kwon. Effectiveness of a polyvinylpyrrolidone interlayer on a zinc oxide film for interfacial modification in inverted polymer solar cells. RSC Advances. 2014; 4 (91):49855-49860.
Chicago/Turabian StyleRaju Lampande; Gyeong Woo Kim; Ramchandra Pode; Jang Hyuk Kwon. 2014. "Effectiveness of a polyvinylpyrrolidone interlayer on a zinc oxide film for interfacial modification in inverted polymer solar cells." RSC Advances 4, no. 91: 49855-49860.
Low level of rural electrification rate is attributed to the high cost of grid expansion combined with the insufficiency of energy resources and lower demand for the energy. Furthermore, populations in rural areas in developing countries are characterized by their low incomes and savings. About 4 billion people live at the base of the pyramid (BoP), having an income of US$1–4/day/person at the local purchasing power parities. Usually, villagers use home lighting for 4–6 h per day and spend about US$5–10 a month on kerosene fuel in most parts of the world. Therefore, the motivation of the present investigation is to provide the modern lighting to rural populations and to replace the currently inefficient and unhealthy kerosene fuel illumination without any addition to the existing expenditure on kerosene fuel based lighting. We have developed a typical 12 V DC LED (light emitting diode) photovoltaic system and installed in CouréMbatar in Senegal and adopted fee-for services energy delivery model. The concept of LED solar lighting with no additional burden to the current cost of lighting is widely accepted by the villagers and may provide the guidelines for a targeted solution for the rural electrification.
Boucar Diouf; Ramchandra Pode. Development of solar home systems for home lighting for the base of the pyramid population. Sustainable Energy Technologies and Assessments 2013, 3, 27 -32.
AMA StyleBoucar Diouf, Ramchandra Pode. Development of solar home systems for home lighting for the base of the pyramid population. Sustainable Energy Technologies and Assessments. 2013; 3 ():27-32.
Chicago/Turabian StyleBoucar Diouf; Ramchandra Pode. 2013. "Development of solar home systems for home lighting for the base of the pyramid population." Sustainable Energy Technologies and Assessments 3, no. : 27-32.
Sub-Saharan Africa has the lowest access to electricity in the World. In Senegal, less than 25% of the rural population benefit of electricity service. Solar energy offers an important potential to Senegal with over 3000 h of sunlight a year. This is a real opportunity to generalize the access to electricity. But, the efforts to bridge the gap must be diversified and completed. We approach the problem of rural electrification with a different point of view. Grid expansion and centralized solutions may be adequate for villages with a population organized in high-density of habitations. Small size villages or those with highly dispersed population may need different propositions because of cost. These regions will not be the priority of electrification programs. Furthermore, this rural population is characterized by its low income and saving. Such a conjuncture suggests the opportunity of a service based fees model for access to electricity. On the basis of a fees-for-service model, individual standalone photovoltaic systems may be a more appropriate solution to cover the priority needs of lighting and mobile phones battery charge for telecommunication. We present a pilot project in a village of Senegal to support the model and demonstrate its feasibility.
Boucar Diouf; Ramchandra Pode; Rita Osei. Initiative for 100% rural electrification in developing countries: Case study of Senegal. Energy Policy 2013, 59, 926 -930.
AMA StyleBoucar Diouf, Ramchandra Pode, Rita Osei. Initiative for 100% rural electrification in developing countries: Case study of Senegal. Energy Policy. 2013; 59 ():926-930.
Chicago/Turabian StyleBoucar Diouf; Ramchandra Pode; Rita Osei. 2013. "Initiative for 100% rural electrification in developing countries: Case study of Senegal." Energy Policy 59, no. : 926-930.
Chandramouli Kulshreshtha; Gyeong Woo Kim; Ramchandra Pode; Jang Hyuk Kwon. A Comparative Study of the V OC in CuPc and SubPc Organic Solar Cells. Molecular Crystals and Liquid Crystals 2013, 585, 128 -137.
AMA StyleChandramouli Kulshreshtha, Gyeong Woo Kim, Ramchandra Pode, Jang Hyuk Kwon. A Comparative Study of the V OC in CuPc and SubPc Organic Solar Cells. Molecular Crystals and Liquid Crystals. 2013; 585 (1):128-137.
Chicago/Turabian StyleChandramouli Kulshreshtha; Gyeong Woo Kim; Ramchandra Pode; Jang Hyuk Kwon. 2013. "A Comparative Study of the V OC in CuPc and SubPc Organic Solar Cells." Molecular Crystals and Liquid Crystals 585, no. 1: 128-137.
This paper demonstrates a comparative study of transition metal oxide materials, tungsten trioxide (WO3) and molybdenum trioxide (MoO3), as an effective hole extraction and transport layer in inverted polymer bulk heterojunction solar cells. Their device performances as an anode buffer layer are investigated based on thieno[3,4-b]thiophene/benzodithiophene (PTB7) and [6,6]-phenyl C70-butyric acid methyl ester(PC70BM) photoactive layers. The fabricated device with WO3 compared with MoO3 shows improved power conversion efficiency as high as 6.67% under a simulated AM1.5G illumination of 100 mW cm−2. The excellent performance of WO3 in inverted bulk heterojunction solar cells is attributed to an efficient hole extraction, excellent electron blocking capability, smooth morphology as well as better ohmic contact between the active layer and the metal electrode.
Raju Lampande; Gyeong Woo Kim; Julien Boizot; Young Jae Kim; Ramchandra Pode; Jang Hyuk Kwon. A highly efficient transition metal oxide layer for hole extraction and transport in inverted polymer bulk heterojunction solar cells. Journal of Materials Chemistry A 2013, 1, 6895 .
AMA StyleRaju Lampande, Gyeong Woo Kim, Julien Boizot, Young Jae Kim, Ramchandra Pode, Jang Hyuk Kwon. A highly efficient transition metal oxide layer for hole extraction and transport in inverted polymer bulk heterojunction solar cells. Journal of Materials Chemistry A. 2013; 1 (23):6895.
Chicago/Turabian StyleRaju Lampande; Gyeong Woo Kim; Julien Boizot; Young Jae Kim; Ramchandra Pode; Jang Hyuk Kwon. 2013. "A highly efficient transition metal oxide layer for hole extraction and transport in inverted polymer bulk heterojunction solar cells." Journal of Materials Chemistry A 1, no. 23: 6895.
The development of new display devices for the interactive communication between computers and people has accelerated over the past decade and considerable progress has recently been made in the area of organic displays. Organic light-emitting devices (OLEDs) are the most suitable candidate to satisfy the demands of next generation displays among the technological options available so far, owing to simple device configuration, high power efficiency and efficient driving schemes, together with solid state encapsulation and excellent user experience. Efficient OLED structures, processes for OLED fabrication, various driving schemes for OLED displays, the current status of fluorescent and phosphorescent OLEDs, top emitting active matrix OLED (AMOLED), passive matrix driving schemes, white OLEDs for high resolution display applications, and thin film transistor (TFT) backplane technology for active matrix OLEDs are discussed here. Finally, the future scope and directions of the high-performance OLED display in mobile display technology and large area TVs are presented.
Jang Hyuk Kwon; Ramchandra Pode; Hye Dong Kim; Ho Kyoon Chung. High-Performance Organic Light-Emitting Diode Displays. Integrated Circuits and Systems 2012, 57 -81.
AMA StyleJang Hyuk Kwon, Ramchandra Pode, Hye Dong Kim, Ho Kyoon Chung. High-Performance Organic Light-Emitting Diode Displays. Integrated Circuits and Systems. 2012; ():57-81.
Chicago/Turabian StyleJang Hyuk Kwon; Ramchandra Pode; Hye Dong Kim; Ho Kyoon Chung. 2012. "High-Performance Organic Light-Emitting Diode Displays." Integrated Circuits and Systems , no. : 57-81.
We report that the S-shaped kink of current density-voltage (J-V) characteristics, which reduce fill factor of organic photovoltaic cells, can be removed by substrate heating during donor layer deposition process. Subphthalocyanine (SubPc) donor film in combination with buckminsterfullerene (C60) acceptor film has been studied in a planar bilayer donor/acceptor heterojunction by J-V characterization under AM 1.5 simulated illuminations with various thicknesses of SubPc donor film. The substrate heating process enhances hole mobility of SubPc film, resulting 8.7% of efficiency enhancement with markedly improvement of S-shaped kink in J-V curves.
Young Hoon Son; Gyeong Woo Kim; Woo Sik Jeon; Ramchandra Pode; Jang Hyuk Kwon. Thermal Annealing Effect of Subphthalocyanine (SubPc) Donor Material in Organic Solar Cells. Molecular Crystals and Liquid Crystals 2012, 565, 8 -13.
AMA StyleYoung Hoon Son, Gyeong Woo Kim, Woo Sik Jeon, Ramchandra Pode, Jang Hyuk Kwon. Thermal Annealing Effect of Subphthalocyanine (SubPc) Donor Material in Organic Solar Cells. Molecular Crystals and Liquid Crystals. 2012; 565 (1):8-13.
Chicago/Turabian StyleYoung Hoon Son; Gyeong Woo Kim; Woo Sik Jeon; Ramchandra Pode; Jang Hyuk Kwon. 2012. "Thermal Annealing Effect of Subphthalocyanine (SubPc) Donor Material in Organic Solar Cells." Molecular Crystals and Liquid Crystals 565, no. 1: 8-13.
Key factors to control the efficiency in iridium doped red and green phosphorescent light emitting diodes (PhOLEDs) are discussed in this review: exciton confinement, charge trapping, dopant concentration and dopant molecular structure. They are not independent from each other but we attempt to present each of them in a situation where its specific effects are predominant. A good efficiency in PhOLEDs requires the triplet energy of host molecules to be sufficiently high to confine the triplet excitons within the emitting layer (EML). Furthermore, triplet excitons must be retained within the EML and should not drift into the nonradiative levels of the electron or hole transport layer (resp., ETL or HTL); this is achieved by carefully choosing the EML’s adjacent layers. We prove how reducing charge trapping results in higher efficiency in PhOLEDs. We show that there is an ideal concentration for a maximum efficiency of PhOLEDs. Finally, we present the effects of molecular structure on the efficiency of PhOLEDs using red iridium complex dopant with different modifications on the ligand to tune its highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) energies.
Boucar Diouf; Woo Sik Jeon; Ramchandra Pode; Jang Hyuk Kwon. Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes. Advances in Materials Science and Engineering 2012, 2012, 1 -14.
AMA StyleBoucar Diouf, Woo Sik Jeon, Ramchandra Pode, Jang Hyuk Kwon. Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes. Advances in Materials Science and Engineering. 2012; 2012 ():1-14.
Chicago/Turabian StyleBoucar Diouf; Woo Sik Jeon; Ramchandra Pode; Jang Hyuk Kwon. 2012. "Efficiency Control in Iridium Complex-Based Phosphorescent Light-Emitting Diodes." Advances in Materials Science and Engineering 2012, no. : 1-14.