Abstract

Transparent white organic light-emitting devices with a $\mathrm{Li}\mathrm{F}∕\mathrm{Yb}:\mathrm{Ag}$ cathode are reported. The device with a structure of indium-tin oxide/ $4,4^{\prime },4^{″}$ -tris(3-methylphenyl-phenylamino)-tripheny-lamine $\left(40\mathrm{nm}\right)∕N,N^{\prime }$-bis-(1-naphthyl)- $N,N^{\prime }$ -diphenyl- $1,1^{\prime }$-biph-enyl-$4,4^{\prime }$-diamine (NPB: $7\mathrm{nm}$)/rubrene $\left(0.1\mathrm{nm}\right)∕\mathrm{NPB}\left(3\mathrm{nm}\right)∕2,2^{\prime },2^{″}$-(1,3,5-phenylene) tris(1-phenyl- $1H$- benzimidazole $\left(30\mathrm{nm}\right)$/tris (8-hydroxyquinoline) aluminum $\left(20\mathrm{nm}\right)∕\mathrm{Li}\mathrm{F}$ $\left(0.5\mathrm{nm}\right)∕\mathrm{Yb}:\mathrm{Ag}$ ($15\mathrm{nm}$, volume ratio 1:1) shows few differences in luminance and color purity from both sides. For instant, at a driving voltage of $10\mathrm{V}$, the luminance and CIE coordinates of $1173∕1488\mathrm{cd}∕{\mathrm{m}}^2$ and $(0.3482,0.3596)∕(0.3508,0.3352)$ are obtained from top/bottom sides. CIE coordinates of the device from both sides are voltage independent, and the maximum total electroluminescence efficiencies of the device are $4.6\mathrm{cd}∕\mathrm{A}$.

© 2009 Optical Society of America

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