Controlling the carrier recombination zone for improved color stability in a two-dopant fluorophore/phosphor white organic light-emitting diode

Unnat S. Bhansali, Huiping Jia, M. A.Quevedo Lopez, Bruce E. Gnade, Wei Hsuan Chen, Mohammad A. Omary

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Abstract

A white organic light-emitting diode (WOLED) is produced upon systematic introduction of deep-blue fluorescence from 4, 4′ -bis(9-ethyl-3- carbazovinylene)- 1, 1′ -biphenyl to broad-band yellow phosphorescence from bis[3,5-bis(2-pyridyl)-1,2,4-triazolato]platinum(II) in the common host 4, 4′ -bis(carbazol-9-yl)biphenyl. The carrier recombination zone is first identified upon investigating alternative device structures, then optimized by varying the thickness of the electron-transport layer. The WOLED exhibits striking stability of color and efficiency, as manifest by parameters at high brightness of 1000 cd/ m2 sustaining 94%-122% their values at 50 cd/ m 2.

Original languageEnglish
Article number203501
JournalApplied Physics Letters
Volume94
Issue number20
DOIs
StatePublished - 2009
Externally publishedYes

Bibliographical note

Funding Information:
This work is supported by the U.S. Department of Energy under Contract No. DE-FC26-06NT42859.

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