Distinguishing triplet energy transfer and trap-assisted recombination in multi-color organic light-emitting diode with an ultrathin phosphorescent emissive layer

Qin Xue, G. Xie, Shouyin Liu, P. Chen, Yi Zhao, Shiyong Liu

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Abstract

An ultrathin layer of deep-red phosphorescent emitter tris(1-phenylisoquinoline) iridium (III) (Ir(piq)3) is inserted within different positions of the electron blocking layer fac-tris (1-phenylpyrazolato-N,C2')-iridium(III) (Ir(ppz)3) to distinguish the contribution of the emission from the triplet exciton energy transfer/diffusion from the adjacent blue phosphorescent emitter and the trap-assisted recombination from the narrow band-gap emitter itself. The charge trapping effect of the narrow band-gap deep-red emitter which forms a quantum-well-like structure also plays a role in shaping the electroluminescent characteristics of multi-color organic light-emitting diodes. By accurately controlling the position of the ultrathin sensing layer, it is considerably easy to balance the white emission which is quite challenging for full-color devices with multiple emission zones. There is nearly no energy transfer detectable if 7 nm thick Ir(ppz)3 is inserted between the blue phosphorescent emitter and the ultrathin red emitter.

Original languageEnglish
Article number114504
Number of pages6
JournalJournal of Applied Physics
Volume115
Issue number11
DOIs
Publication statusPublished - 19 Mar 2014

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