Study on the performance of organic light-emitting diode with N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine doped in polystyrene as hole transporting layer

Jing Deng; Guangzhong Xie; Junsheng Yu; Fan Suo; Weizhi Li; Yadong Jiang

doi:10.1117/12.783538

14 November 2007 Study on the performance of organic light-emitting diode with N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine doped in polystyrene as hole transporting layer

Jing Deng, Guangzhong Xie, Junsheng Yu, Fan Suo, Weizhi Li, Yadong Jiang

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Proceedings Volume 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies; 67223P (2007) https://doi.org/10.1117/12.783538
Event: 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 2007, Chengdu, China

Abstract

Organic light-emitting diodes (OLEDs) with a structure of indium-tin-oxide(ITO)/N,N'-bis(3-methyl¬phenyl)-N,N'-diphenylbenzidine(TPD):polystyrene(PS)/tris(8-hydroxyquinoline)-aluminum(Alq3)/Mg:Ag were fabricated. Among them PS:TPD thin film acts as a hole transporting layer (HTL) and was prepared via dimethylbenzene solution dissolved with a mixture of PS:TPD by spin-coating method. The influence of TPD doped ratio in the mixture on the performance of device was investigated. Experimental results show that luminescent brightness of devices increase with the enhancement of TPD doped ratio, while electroluminescent spectra are not affected. In addition, lifetime of the device when the ratio of TPD to PS is 7:3 was 4 times higher than that of pure-TPD device. This phenomenon was postulated that PS enhanced the uniformity of TPD film, which was characterized by the result of atomic force microscope (AFM) analysis, and thus overcame the shortcoming of low stability of small-molecular film.

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Jing Deng, Guangzhong Xie, Junsheng Yu, Fan Suo, Weizhi Li, and Yadong Jiang "Study on the performance of organic light-emitting diode with N,N'-bis(3-methylphenyl)-N,N'-diphenylbenzidine doped in polystyrene as hole transporting layer", Proc. SPIE 6722, 3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, 67223P (14 November 2007); https://doi.org/10.1117/12.783538

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KEYWORDS

Telescopic pixel displays

Picosecond phenomena

Organic light emitting diodes

Electroluminescence

Measurement devices

Molecules

Thin films

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