Efficient red phosphorescent organic light emitting diodes based on solution processed all-inorganic cesium lead halide perovskite as hole transporting layer |
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| Institution: | 1. Photo-electronic Hybrids Research Center, Korea Institute of Science and Technology (KIST), Seoul 02792, Republic of Korea;2. Division of Energy and Environment, KIST School, University of Science and Technology (UST), Daejeon 34113, Republic of Korea;3. Department of Chemical Engineering, Hanyang University, Seoul 04763, Republic of Korea;1. Department of Chemistry/Display Research Center, Catholic University of Korea, 43 Jibongro, Wonmigu, Bucheon 420-743, South Korea;2. Research Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan 681-802, South Korea;1. Wuhan National Laboratory for Optoelectronics (WNLO), Huazhong University of Science and Technology, Wuhan 430074, People''s Republic of China;2. School of Materials Science of Technology, Wuhan, 430205, People''s Republic of China;1. Lviv Polytechnic National University, S. Bandera 12, 79013 Lviv, Ukraine;2. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, United States;3. Bohdan Khmelnytsky National University, Shevchenko 81, 18031 Cherkassy, Ukraine;4. Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, 10691 Stockholm, Sweden;5. Rzeszow University of Technology, Wincentego Pola 2, Rzeszow 35-959, Poland;6. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland;7. Department of Polymer Chemistry and Technology, Kaunas University of Technology, Radvilenu Plentas 19, LT-50254 Kaunas, Lithuania;8. Ivan Franko Lviv National University, M. Dragomanova 50, 79005 Lviv Ukraine;9. Institute of Materials Science, Kaunas University of Technology, K. Bar?ausko St. 59, LT51423 Kaunas, Lithuania;10. Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Svobodny Pr. 79, 660041 Krasnoyarsk, Russia |
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| Abstract: | An efficient red phosphorescent organic light emitting diode (PhOLED) has been realized by utilizing a composite hole transporting layer comprised of all-inorganic cesium lead halide perovskite CsPbBr3 via spin-coating and 1,3-bis(9-carbazolyl) benzene (mCP) by vacuum depositing, in which CsPbBr3 film is used as a hole transporting layer and mCP plays a dominant role in electron and exciton blocking. And this PhOLED shows a saturated red emission coordinated at CIE (0.65, 0.33) driven at 7.5 V, a maximum brightness of 20,750 cd/m2, and a maximum current efficiency of 10.64 cd/A, which is as 1.87 times as that 5.68 cd/A of the reference PhOLEDs based on traditional small organic molecular hole transporting material N,N′-bis(naphthalen-1-yl)-N,N′-bis(phenyl)-benzi (NPB). The electroluminescent (EL) spectra and the energy level alignment of different PhOLEDs are investigated. The enhanced EL performances are ascribed to improved hole injecting and transporting behaviors, and better electron and exciton confinements by introducing the composite hole transporting layer CsPbBr3/mCP. |
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| Keywords: | All-inorganic cesium lead halide perovskite Exciton blocking layer Hole transporting layer |
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