期刊
ORGANIC ELECTRONICS
卷 10, 期 4, 页码 686-691出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2009.03.002
关键词
Deep-blue phosphorescent organic light-emitting devices (PHOLEDs); Electron transport materials; Alkaline doping; p-i-n; Dual-emissive-layer (D-EML)
资金
- US Department of Energy Solid State Lighting Program [DE-FC26-06NT42855]
- Samsung SDI. Co., Ltd
We investigate the performance of FIr6-based deep-blue phosphorescent organic light-emitting devices (PHOLEDs) with three different electron transport materials, bathocuproine (BCP), 4,7-diphenyl-1,10-phenanthroline (BPhen), and tris[3-(3-pyridyl)mesityl]borane (3TPYMB), and study the effect of doping alkaline metals (Li and Cs) into these charge transport materials. External quantum efficiency (eta(EQE)) of (20 +/- 1)% and peak power efficiency (eta(p)) of (36 +/- 2) Im/W were achieved maintaining Commission Internationale de L'Eclairage (CIE) coordinates of (x = 0.16, y = 0.28) in p-i-n dual-emissive-layer (D-EML) deep-blue PHOLEDs with 3TPYMB as the electron transport material and 3TPYMB:Cs as the electron injection layer. The high efficiencies are attributed to the high triplet energy of 3TPYMB as well as the increased conductivity of 3TPYMB:Cs. (C) 2009 Elsevier B.V. All rights reserved.
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