Excimer-based red/near-infrared organic light-emitting diodes with very high quantum efficiency

被引：87

作者：

Cocchi, M. ^{[1
]}

Kalinowski, J. ^{[2
]}

Virgili, D. ^{[1
]}

Williams, J. A. G. ^{[3
]}

机构：

[1] CNR, ISOF CNR, Inst Organ Synth & Photoreactiv, I-40129 Bologna, Italy

[2] Gdansk Univ Technol, Dept Mol Phys, PL-80952 Gdansk, Poland

[3] Univ Durham, Dept Chem, Durham DH1 3LE, England

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 11期

关键词：

D O I：

10.1063/1.2898159

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Various light output measures of red/near-infrared (NIR) excimer-based organic light-emitting diodes (LEDs) are reported for different cathodes (Al, Al/LiF, Ca, and Ca/PbO(2)). By using a selected phosphor (PtL(2)Cl) from a series of terdentate cyclometallated efficient phosphorescent Pt(II) complexes, PtL(n)Cl, as the neat film emitting layer and a Ca/Pb(IV)O(2) cathode, the authors achieve unusually high forward viewing external quantum efficiencies of up to 14.5% photons/electron and a power conversion efficiency of up to 6% at a high emission forward output of 25 mW/cm(2). These are the highest efficiencies reported for a NIR organic LED. Electron tunneling through thin insulating layers of LiF and Pb(IV)O(2) and the difference in band bending at the organic electron transporting layer and the cathode between the samples are used to explain this performance achievement. (C) 2008 American Institute of Physics.

引用

页数：3

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