Issue 39, 2010

Highly efficient orange-red organic light-emitting diode using double emissive layers with stepwise energy-level architecture

Abstract

This study demonstrates a highly efficient orange-red organic light-emitting diode with a double emissive layer architecture that exhibits a record-breaking power efficiency of 47 lm W−1 at 100 cd m−2, or 32 lm W−1 at 1 000 cd m−2. Two factors may contribute to the high efficiency. First, the device architecture has a stepwise energy-level, leading to a significantly reduced energy-barrier for both hole and electron to transport, revealed by the relatively low driving voltage. Second, employing a hole-transporting host and an electron-transporting host leads to a nearly perfect balanced injection of hole and electron to the emissive zones, indicated by the obtained external quantum efficiency that reaches the 20% theoretical limit.

Graphical abstract: Highly efficient orange-red organic light-emitting diode using double emissive layers with stepwise energy-level architecture

Article information

Article type
Communication
Submitted
03 Jul 2010
Accepted
11 Aug 2010
First published
31 Aug 2010

J. Mater. Chem., 2010,20, 8464-8466

Highly efficient orange-red organic light-emitting diode using double emissive layers with stepwise energy-level architecture

J. Jou, P. Wu, C. Lin, M. Wu, Y. Chou, H. Wang and S. Shen, J. Mater. Chem., 2010, 20, 8464 DOI: 10.1039/C0JM02102D

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