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Issue 26, 2011
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Highly efficient blue organic light-emitting diode with an oligomeric host having high triplet-energy and high electron mobility

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Abstract

We report a high-efficiency blue organic light-emitting diode (OLED) with a solution-processed emissive layer composed of an oligomeric host of poly[3-(carbazol-9-ylmethyl)-3-methyloxetane] (PCMO) that possesses high triplet-energy and high electron mobility. The device exhibited a current efficiency of 40.4 cd A−1 with an external quantum efficiency (EQE) of 21.6% and power efficiency of 28.2 lm W−1 at 230 cd m−2 or 24.7 cd A−1, 10.3%, and 15.5 lm W−1 at 1 000 cd m−2. The high efficiency may be attributed to the host possessing a high electron mobility and lower electron injection barrier, resulting in a more balanced carrier-injection. Moreover, the high electron-mobility favors the transport of electrons, resulting in a more balanced carrier-injection in the emissive layer. The device efficiency has been further enhanced to 42.6 cd A−1 (22.9%, 29.7 lm W−1) at 124 cd m−2 or 28.8 cd A−1 (15.4%, 17.8 lm W−1) at 1 000 cd m−2 by pre-heating the emissive solution at an elevated temperature before spin-coating.

Graphical abstract: Highly efficient blue organic light-emitting diode with an oligomeric host having high triplet-energy and high electron mobility

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Article information


Submitted
10 Feb 2011
Accepted
09 May 2011
First published
02 Jun 2011

J. Mater. Chem., 2011,21, 9546-9552
Article type
Paper

Highly efficient blue organic light-emitting diode with an oligomeric host having high triplet-energy and high electron mobility

J. Jou, W. Wang, S. Shen, S. Kumar, I. Lai, J. Shyue, S. Lengvinaite, R. Zostautiene, J. V. Grazulevicius, S. Grigalevicius, S. Chen and C. Wu, J. Mater. Chem., 2011, 21, 9546
DOI: 10.1039/C1JM10609K

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