Drastic drop of external quantum efficiency at liquid nitrogen temperature in a bilayer blue phosphorescent organic light-emitting device
- Authors
- Ha, Mi-Young; Park, Da-Young; Lee, Min-Jae; Choi, Seung-Jung; Jung, Jae-Hoon; Moon, Dae-Gyu
- Issue Date
- Jul-2016
- Publisher
- Elsevier BV
- Keywords
- OLED; Phosphorescence; Blue; Bilayer; Liquid nitrogen temperature
- Citation
- Synthetic Metals, v.217, pp 244 - 247
- Pages
- 4
- Journal Title
- Synthetic Metals
- Volume
- 217
- Start Page
- 244
- End Page
- 247
- URI
- https://scholarworks.bwise.kr/sch/handle/2021.sw.sch/8986
- DOI
- 10.1016/j.synthmet.2016.04.010
- ISSN
- 0379-6779
- Abstract
- We have investigated substantial drop of external quantum efficiency (EQE) at liquid nitrogen temperature in a bilayer blue phosphorescent organic light emitting device with a structure of ITO/TAPC: FirpiciTAZ/LiF/A1, where TAPC, Firpic, and TAZ represent 1,1-bis[(di-4-tolylamino)phenyl]cyclohexane, iridium(111)bis1(4,6-difluorophenyl)-pyridinato-N,C2Ipicolinate, and 3-(biphenyl-4-yl)-4-phenyl-5-(4tert-butyl-phenyl)-1,2,4-triazole, respectively. The device exhibits a high EQE of 17.2% at room temperature although it has a simple bilayer structure. However, the quantum efficiency drops drastically to 0.8% at liquid nitrogen temperature. We studied this drastic drop of EQE in viewpoints of carrier conduction, carrier recombination, photoluminescence quantum efficiency, and energy transfer. (C) 2016 Elsevier B.V. All rights reserved.
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Collections - College of Engineering > Department of Display Materials Engineering > 1. Journal Articles
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