High efficiency and color saturated blue electroluminescence by using 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl as the thinner host and hole-transporter

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• 作者：Mingtao Li ; Wenlian Li ; Wenming Su ; Faxin Zang ; Bei Chu ; Qi Xin ; Defeng Bi ; Bin Li ; Tianzhi Yu
• 关键词：Blue OLED ; NPB host ; Carrier recombination
• 刊名：Solid-State Electronics
• 出版年：2008
• 出版时间：January 2008
• 年：2008
• 卷：52
• 期：1
• 页码：121-125
• 全文大小：438 K

文摘

A traditional hole-transporting (HT) material, 4,4′-bis[N-(1-naphthyl)-N-phenylamino]biphenyl (NPB) was used as the host to fabricate a blue organic light-emitting diode (OLED) in which the blue dopant emitter is 2,5,8,11-tetra-t-butyl-perylene (TBP) and the another NPB layer adjusted to thinner host was also used as the HT-layer. The blue electroluminescent (EL) was proved to be originated from the narrower doped layer and the adjacent NPB HT-layer. Compared with the previous blue EL devices based on TBP dopant, the performances of the blue OLED were improved by using a thinner NPB host layer. The blue OLED shows higher efficiency and better blue color saturation, such as the device behaving a maximum efficiency of 4.6 cd/A, CIE color coordinates of x = 0.136 and y = 0.173 at a bias of 5 V, and a peak luminance of 11,500 cd/m² at a bias of 20 V. The operation mechanism of the blue device was also discussed.