Saturated and efficient blue phosphorescent organic light emitting devices with Lambertian angular emission

The authors employ a microcavity to optimize the color of a phosphorescent organic light emitting device (OLED) based on the-sky blue phosphor FIrpic. The output of the OLED is filtered by scattering media to correct the angular emission intensity profile and eliminate the angular dependence of the...

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Bibliographic Details
Published in:Applied physics letters 2007-05, Vol.90 (21), p.211109-211109-3
Main Authors: Mulder, C. L., Celebi, K., Milaninia, K. M., Baldo, M. A.
Format: Article
Language:English
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Summary:The authors employ a microcavity to optimize the color of a phosphorescent organic light emitting device (OLED) based on the-sky blue phosphor FIrpic. The output of the OLED is filtered by scattering media to correct the angular emission intensity profile and eliminate the angular dependence of the color. With a holographic diffuser as the scattering medium, the microcavity OLED achieves an external quantum efficiency of ( 5.5 ± 0.6 ) % , as compared to ( 3.8 ± 0.4 ) % for a conventional structure. The color coordinates of the microcavity OLED with holographic diffuser are ( x , y ) = ( 0.116 ± 0.004 , 0.136 ± 0.010 ) with minimal angular color shift and a nearly ideal Lambertian angular emission profile.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.2742577