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Proceedings Paper

Simulation of exciton effects in OLEDs based on the master equation
Author(s): Weifeng Zhou; Christoph Zimmermann; Christoph Jungemann
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Paper Abstract

Electroluminescence in organic light-emitting diodes is simulated by the master equations for free carriers and excitons. The IV characteristics of both unipolar and bipolar devices can be well reproduced. The luminous efficacies of the phosphorescent OLEDs, which are doped with Ir(ppy)3 in the emission layer, depend on both the triplet generation zone and the triplet transfer capability. Triplet diffusion into the hole-transport layer is primarily attributed to the decline in efficiencies of OLEDs with low emitter concentrations. Higher luminous efficacies can be obtained by graded doping profiles with the merits of broad triplet distribution within and confined to the emission layer. Moreover, triplet-polaron quenching plays a more significant role in the triplet loss than triplet-triplet annihilation does according to our simulations.

Paper Details

Date Published: 25 August 2017
PDF: 9 pages
Proc. SPIE 10362, Organic Light Emitting Materials and Devices XXI, 103621T (25 August 2017); doi: 10.1117/12.2269972
Show Author Affiliations
Weifeng Zhou, RWTH Aachen Univ. (Germany)
Christoph Zimmermann, RWTH Aachen Univ. (Germany)
Christoph Jungemann, RWTH Aachen Univ. (Germany)

Published in SPIE Proceedings Vol. 10362:
Organic Light Emitting Materials and Devices XXI
Franky So; Chihaya Adachi; Jang-Joo Kim, Editor(s)

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