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Erschienen in: Optical and Quantum Electronics 2/2015

01.02.2015

Effect of hole mobilities through the emissive layer on space charge limited currents of phosphorescent organic light-emitting diodes

verfasst von: Yang Luo, Yu Duan, Ping Chen, Yi Zhao

Erschienen in: Optical and Quantum Electronics | Ausgabe 2/2015

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Abstract

In this letter, we used space charge limited current measurements to evaluate the hole mobilities of candidate host materials with or without doped phosphorescent guests through a study of “hole only” devices. We found different impacts to hole mobility in each material when the dopant concentration changes. We postulated that the guest/host energy level matching in the light emissive layer plays an important role in the performance of organic light emitting devices. A number of white organic light emitting devices were designed to prove the supposition. Using guest/host energy level matching a device was fabricated which demonstrated higher efficiency, lower efficiency roll-off and lower driving voltage compared to a non-level-matched device.

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Metadaten
Titel
Effect of hole mobilities through the emissive layer on space charge limited currents of phosphorescent organic light-emitting diodes
verfasst von
Yang Luo
Yu Duan
Ping Chen
Yi Zhao
Publikationsdatum
01.02.2015
Verlag
Springer US
Erschienen in
Optical and Quantum Electronics / Ausgabe 2/2015
Print ISSN: 0306-8919
Elektronische ISSN: 1572-817X
DOI
https://doi.org/10.1007/s11082-014-9919-x

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