4.6 Article

High-efficiency red, green and blue phosphorescent homojunction organic light-emitting diodes based on bipolar host materials

期刊

ORGANIC ELECTRONICS
卷 12, 期 5, 页码 843-850

出版社

ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2011.01.021

关键词

Organic light-emitting diodes; Phosphorescent; p-i-n Homojunction; Bipolar host material

资金

  1. Grants-in-Aid for Scientific Research [23750204] Funding Source: KAKEN

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In this paper, we demonstrate red, green and blue (RGB) phosphorescent p-i-n homojunction devices by using a series of bipolar host materials, including 2,6-bis(3-(carbazol-9-yl)phenyl) pyridine (26DCzPPy), 3,5-bis(3-(carbazol-9-yl) phenyl) pyridine (35DCzPPy) and 4,6-bis(3-(carbazol-9-yl) phenyl) pyrimidine (46DCzPPm). Homojunction devices comprise a MoO(3)-doped host as a hole transport layer, and a Cs(2)CO(3)-doped host as an electron transport layer. Emission layer consists of a host doped with iridium(III) bis(4,6-(di-fluorophenyl)pyridinato-N,C(2)') picolinate (FIrpic) for blue, fac-tris(2-phenylpyridine) iridium (Ir(ppy)(3)) for green, and tris(1-phenylisoquinolinolato-C(2),N)iridium(III) (Ir(piq)(3)) for red devices. External quantum efficiencies of 12.9% for the 35DCzPPy-based blue, 9.5% for the 46DCzPPm-based green, and 8.5% for the 46DCzPPm-based red devices were achieved at 100 cd m(-2). By systematically investigating carrier balance in these homojunction devices, well-balanced charge carrier injection and transport in emission layers are found to be critical factors for constructing efficient homojunction devices. (C) 2011 Published by Elsevier B.V.

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