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Highly efficient yellow organic light emitting diode based on a layer-cross faded emission layer allowing easy color tuning
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Figures

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FIG. 1.

Yellow OLED layer structure with a mixed-host EL in (a) and a cross-faded EL in (b). The solid material curves symbolize the fraction of each material in the EL. The arrow at point A indicates a shift in the red to green doped area. The arrow at point B indicates an exemplary slope adjustment of the TMM004 fraction curve from the solid to dashed blue line.

Image of FIG. 2.

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FIG. 2.

Energy level diagram of HOMO and LUMO of two-color yellow OLED.

Image of FIG. 3.

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FIG. 3.

Spectra of cross-faded OLED presented in Table I. Inset: CIE plot of OLED color coordinates presented in Table I.

Tables

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Table I.

Comparison of cross-faded (LCF) and mixed-host (MH) EL yellow OLED.

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/content/aip/journal/apl/95/21/10.1063/1.3266849
2009-11-25
2014-04-24

Abstract

An easy way to adjust the color of yellow organic light emitting diodes(OLED) is realized by basing the emission layer on a cross-fading zone of two unipolar-conducting host materialsdoping parts of it either with a red or green phosphorescent emitter at varying thickness ratios. At color coordinates of 0.47/0.50, a current efficacy of 42.2 cd/A (16.2% external quantum efficiency) and a power efficacy of 32.9 lm/W are measured without light extraction enhancement. Mixed-host emission layer OLED without cross-fading are processed for comparison. Exciton distributions are studied. The concept is suggested to be useful for white OLED.

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Scitation: Highly efficient yellow organic light emitting diode based on a layer-cross faded emission layer allowing easy color tuning
http://aip.metastore.ingenta.com/content/aip/journal/apl/95/21/10.1063/1.3266849
10.1063/1.3266849
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