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Small molecular phosphorescent organic light-emitting diodes using a spin-coated hole blocking layer
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/content/aip/journal/apl/100/8/10.1063/1.3688300
2012-02-23
2014-11-28

Abstract

Small molecular green phosphorescent organic light-emitting diodes(OLEDs) have been studied using a solution processed polyethyleneoxide (PEO) hole blocking layer (HBL) and a Cs2CO3/Al cathode. PEO is soluable in alcoholic solvents and allows the fabrication of multilayerOLEDs by successive spin-coating. The current efficiency of the optimized OLED with the PEO HBL increases from 18.8 cd/A to 32.1 cd/A, and the turn-on voltage reduces from 4.8 V to 3.4 V, compared with the device without the PEO HBL. Photovoltaic measurements indicate that the injection barrier for electron is reduced by inserting the PEO layer. X-ray photoelectron spectroscopy measurements further reveal that improvement in device performance is due to the partial penetration of Cs into the PEO layer.

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Scitation: Small molecular phosphorescent organic light-emitting diodes using a spin-coated hole blocking layer
http://aip.metastore.ingenta.com/content/aip/journal/apl/100/8/10.1063/1.3688300
10.1063/1.3688300
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