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High efficiency blue phosphorescent organic light emitting diodes using a simple device structure
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FIG. 1.

Chemical structure of SPPO1 and device structures of blue PHOLEDs including energy level diagram of the blue PHOLED.

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FIG. 2.

Current density–voltage-luminance characteristics of blue PHOLEDs with different electron transport layers.

Image of FIG. 3.

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FIG. 3.

Quantum efficiency and power efficiency of blue PHOLEDs with different electron transport layers. (a) Quantum efficiency luminance and (b) power efficiency luminance.

Image of FIG. 4.

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FIG. 4.

Current efficiency of blue PHOLEDs with different electron transport layers.

Image of FIG. 5.

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FIG. 5.

Electroluminescence spectra of blue PHOLEDs with different electron transport layers.

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/content/aip/journal/apl/94/1/10.1063/1.3046288
2009-01-05
2014-04-21

Abstract

High efficiency blue phosphorescent organic light emitting diodes have been developed by using a simple device structure. A derivative of spirobifluorene based phosphine oxide was used both as a host and an electron transport layer with an exciton blocking function. A maximum quantum efficiency of 19.2% and a current efficiency of were obtained by using a simple device structure without a hole blocking layer.

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Scitation: High efficiency blue phosphorescent organic light emitting diodes using a simple device structure
http://aip.metastore.ingenta.com/content/aip/journal/apl/94/1/10.1063/1.3046288
10.1063/1.3046288
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