Blue phosphorescent organic light-emitting device with double emitting layer
- 1 June 2009
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 94 (22), 223301
- https://doi.org/10.1063/1.3147866
Abstract
In this paper, we demonstrated a blue phosphorescent organic light-emitting device(OLED) with a higher current-efficiency and a lower driving-voltage using conventional iridium(III)bis[4,6-(di-fluorophenyl)-pyridinato- N , C 2 ′ ] picolinate (FIrpic) doped in the double emitting layer (DEML), which consists of a hole- and an electron-transporting material, N , N ′ -dicarbazolyl-3,5-benzene (mCP) and 2 , 2 ′ -bis[5-phenyl-2-(1,3,4)oxadazolyl]biphenyl (OXD), respectively. Compared to OLEDs with only single mCP- and OXD-EML, current-efficiency of the optimized DEML-OLED increases by 30.82% and 141.37%, combining with a voltage reduction of 0.34 and 0.59 V at 50 mA / cm 2 , which comes from the better charge balance in DEML.Keywords
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