New Bipolar Host Materials for Realizing Blue Phosphorescent Organic Light-Emitting Diodes with High Efficiency at 1000 cd/m(2)
- Authors
- Cho, Min Ju; Kim, Sun Jae; Yoon, Seung Hee; Shin, Jicheol; Hong, Tae Ryang; Kim, Hyung Jong; Son, Young Hoon; Kang, Ju Sik; Um, Hyun Ah; Lee, Tae Wan; Bin, Jong-Kwan; Lee, Bang Sook; Yang, Joong Hwan; Chae, Gee Sung; Kwon, Jang Hyuk; Choi, Dong Hoon
- Issue Date
- 26-11월-2014
- Publisher
- AMER CHEMICAL SOC
- Keywords
- organic light emitting diode; phosphorescence; bipolar host; carboline; quantum efficiency
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.6, no.22, pp.19808 - 19815
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 6
- Number
- 22
- Start Page
- 19808
- End Page
- 19815
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/96734
- DOI
- 10.1021/am505049h
- ISSN
- 1944-8244
- Abstract
- New host molecules such as 9-(6-(9H-carbazol-9-yl)pyridin-3-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (pPCB2CZ) and 9-(6-(9H-carbazol-9-yl)pyridin-2-yl)-6-(9H-carbazol-9-yl)-9H-pyrido[2,3-b]indole (mPCB2CZ) were designed and synthesized for blue phosphorescent organic light-emitting diodes (PhOLEDs). The glass transition temperatures of two host molecules were measured higher than 120 degrees C, and the identical triplet energies were determined to be 2.92 eV for both molecules. The bis(3,5-difluoro-2-(2-pyridyl)phenyl-(2-carboxypyridyl)iridium(III) (FIrpic)-doped mPCB2CZ-based PhOLED exhibited practically useful driving voltage of 4.8 V in a simple organic three layer device configuration which has a smaller number of interfaces in conventional multilayer PhOLEDs. Also, the high quantum efficiency of 23.7% is reported at the practically useful brightness value of 1000 cd/m(2).
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