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High-efficiency and color-stable white organic light-emitting devices based on sky blue electrofluorescence and orange electrophosphorescence
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Figures

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FIG. 1.

The configuration (and the energy diagram of the devices) and the molecular structures of the relevant compounds used in WOLEDs. The energy levels were taken from Refs. 11, 13, 14, 19, and 20. The inset shows the absorption and PL spectra of and BUBD-1, respectively.

Image of FIG. 2.

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FIG. 2.

EL spectra of device D at varying current densities. The inset shows the corresponding CIE coordinates in the chromaticity diagram.

Image of FIG. 3.

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FIG. 3.

Dependence of the luminance efficiency on the current density and inserted is current density–voltage–luminance curves for devices D–F.

Image of FIG. 4.

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FIG. 4.

A proposed simplified energy transfer mechanism for the B fluorescent/orange phosphorescent WOLEDs.

Tables

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Table I.

EL performance of F/P-mediated WOLEDs A–F.

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/content/aip/journal/apl/92/8/10.1063/1.2883935
2008-02-25
2014-04-16

Abstract

Highly efficient and color-stable two-wavelength white organic light-emitting devices (WOLEDs) combining an orange phosphor and a sky blue fluorescent dye BUBD-1 are fabricated where the host singlet is resonant with the fluorophore singlet state and the host triplet is resonant with the phosphor triplet level. A thin layer of 1,3,5-tris[-(phenyl)benzimidazole]benzene between the phosphorescent and the fluorescent regions confines both singlet and triplet excitons efficiently and suppress Dexter transfer of the phosphorexcitons to the nonradiative triplet state of BUBD-1. The best device reaches peak efficiencies of and which are superior to common two-color all-fluorescent or all-phosphor WOLEDs.

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Scitation: High-efficiency and color-stable white organic light-emitting devices based on sky blue electrofluorescence and orange electrophosphorescence
http://aip.metastore.ingenta.com/content/aip/journal/apl/92/8/10.1063/1.2883935
10.1063/1.2883935
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