Role of the interfacial layer in the efficiency and lifetime of polymeric light emitting devices

被引：0

作者：

Chin, Byung Doo ^{[1
]}

Kang, Nam Su ^{[1
]}

Yu, Jae-Woong ^{[1
]}

Mu Jo, Seong ^{[1
]}

Lee, Jun Yeob ^{[2
]}

机构：

[1] Optoelectronic Materials Research Center, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul 130-650, Korea, Republic of

[2] Department of Polymer Engineering, Dankook University, Hannam-Dong, Yongsan-Ku, Seoul, 140-714, Korea, Republic of

来源：

Journal of Applied Physics | 2007年 / 102卷 / 02期

关键词：

The effects of the interfacial layers on the properties of fluorescent polymeric light emitting devices were investigated. The interfacial layer material; poly(9; 9′; -dioctylfluorene-; co; -; bis; N; N′; -(4-ethoxycarbonylphenyl)-; -phenyl-benzidine; (BFEC); has uniform surface roughness and high hole mobility upon thermal treatment up to 250 °C. Both for commercially available fluorescent red and green polymeric light emitters; the insertion of a BFEC interfacial layer resulted in a more than 30% increase of efficiency and a three times longer half-lifetime; whereas the blue fluorescent material showed no enhancement of power efficiency and lifetime. We attribute the improved device performance afforded by the interfacial layer to the bilayered devices having a more charge-balanced structure. The facilitated hole injection and electron/exciton blocking of the interfacial layer induced an infinitesimal shift of the recombination region; which was characterized by the electroluminescent spectra of the devices and the photoluminescent spectra of the bilayers. © 2007 American Institute of Physics;

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摘要：

Journal article (JA)

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