Single-Layer Blue Electrophosphorescent Organic Light-Emitting Diodes Based on Small-Molecule Mixed Hosts: Comparison between the Solution and Vacuum Fabrication Processes

Single-layer and efficient blue phosphorescence organic light-emitting diodes (PHOLEDs) utilizing a small molecule host, bis[3,5-di(9 H -carbazol-9-yl)phenyl]diphenylsilane (SimCP2), as the host material were investigated. All active components including SimCP2, 1,3-bis[(4- tert -butylphenyl)-1,3,4-...

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Published in:Japanese Journal of Applied Physics 2013-01, Vol.52 (1), p.012101-012101-6
Main Authors: Liu, Shun-Wei, Chang, Yung-Ting, Lee, Chih-Chien, Yuan, Chih-Hsien, Liu, Li-An, Chen, Yu-San, Lin, Chun-Feng, Wu, Chih-I, Chen, Chin-Ti
Format: Article
Language:English
Subjects:
Current efficiency
Devices
Organic light-emitting diodes
Phosphorescence
Power efficiency
Quantum efficiency
Wet processing
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Summary:Single-layer and efficient blue phosphorescence organic light-emitting diodes (PHOLEDs) utilizing a small molecule host, bis[3,5-di(9 H -carbazol-9-yl)phenyl]diphenylsilane (SimCP2), as the host material were investigated. All active components including SimCP2, 1,3-bis[(4- tert -butylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD-7), and iridium(III) bis[(4,6-di-fluorophenyl)-pyridinato- N , C $^{2}$] picolinate (FIrpic) were mixed in an organic solution for wet processing in the fabrication of single-layer PHOLEDs. The device's performance significantly exceeds other small-molecule-host, single-layer, blue PHOLEDs fabricated by the solution process. With minimum efficiency roll-off, a maximum current efficiency of 13.6 cd/A, power efficiency of 8 lm/W, external quantum efficiency of 4.71%, and Commission Internationale de L'Eclairage (CIE x,y ) coordinates of $(0.15,0.36)$ at 600 cd/m 2 have been achieved. In addition, the device performance of the solution-processed single-layer PHOLED is much greater than that of its vacuum-deposited counterparts.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAP.52.012101