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Proceedings Paper

High-efficiency blue organic light-emitting devices based on phosphorescent dopant material
Author(s): Jiang Zhong; Yadong Jiang; Lei Zhang; Junsheng Yu
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Paper Abstract

A novel kind of multilayer blue electrophosphorescent organic light-emitting diode (PHOLED) is developed via vacuum thermal deposition method. Host and dopant materials are co-deposited to fabricate as an emissive layer (EML) in one vacuum chamber. The (tpbi)2Ir(acac) as dopant material is synthesized based on noble metal element iridium. The film thickness of each layer is in situ controlled with a quartz crystal microbalance. The typical device structure is ITO/CuPc (30nm)/NPB (40nm)/TPBi(30nm):(tpbi)2Ir(acac) (X wt%)/Alq3 (20nm)/LiF (1nm)/Al (100nm), where X wt% stands for the doping concentration ranging from 1 to 4 wt%. Optoelectronic characteristics including current, bias voltage, brightness, efficiency and spectrum of the devices is characterized. The results showed that the current of the device under low applied voltage is consistent with the Richaardon-Schotty emission, and has linear relationship under different voltages. When X wt% is 3 wt%, a maximum luminance efficiency of the PHOLED of 5.37lm/W with a luminance of 317cd/m2 at 7.0V is obtained. When the driving voltage is 15 V, the brightness of the device reached to 7,827 cd/m2, corresponding to the CIE coordinates of x=0.142, y=0.217.

Paper Details

Date Published: 21 May 2009
PDF: 6 pages
Proc. SPIE 7282, 4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 728233 (21 May 2009); doi: 10.1117/12.831016
Show Author Affiliations
Jiang Zhong, Univ. of Electronic Science and Technology of China (China)
Yadong Jiang, Univ. of Electronic Science and Technology of China (China)
Lei Zhang, Univ. of Electronic Science and Technology of China (China)
Junsheng Yu, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 7282:
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies
Li Yang; John M. Schoen; Yoshiharu Namba; Shengyi Li, Editor(s)

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