2007•Journal of Optoelectronics·laserRequires access

Blue Organic Light Emitting Diodes with Graded Junction

Zhilin Zhang

Abstract

A blue organic light emitting diode(OLED) with a graded junction(GJ) at hole transporting layer(HTL) and emitted layer(EML) interface was constructed.Compared with the conventional heterojunction(HJ) OLED,GJ OLED exhibited significantly improved stability,and the half lifetime achieved 6998 h at initial luminance 100 cd/m2,which is more than 6 times longer than that of HJ OLED.And a Gaq thin layer is inserted in the TBADN/Alq interface,the step barrier from Alq Gaq to TBADN for electron injection is though formed.The GJ devices with Gaq layer show 20% higher efficiency than that of conventional and 7 times longer lifetime than that of HJ one.

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Key concepts: OLED, Optoelectronics, Materials science, Diode, Luminance, Layer (electronics), Heterojunction, Light-emitting diode