Increased performance of an organic light-emitting diode by employing a zinc phthalocyanine based composite hole transport layer

doi:10.1088/1674-1056/22/12/127304

Abstract We demonstrate that the electroluminescent performances of organic light-emitting diodes are significantly improved by employing a zinc phthalocyanine (ZnPc)-based composite hole transport layer (c-HTL). The optimum ris-(8-hydroxyquinoline)aluminum (Alq₃)-based organic light-emitting diode with a c-HTL exhibits a lower turn-on voltage of 2.8 V, a higher maximum current efficiency of 3.40 cd/A and a higher maximum power efficiency of 1.91 lm/W, which are superior to those of the conventional device (turn-on voltage of 3.8 V, maximum current efficiency of 2.60 cd/A, and maximum power efficiency of 1.21 lm/W). We systematically studied the effects of different kinds of N’-diphenyl-N,N’-bis(1-naphthyl)(1,1’-biphenyl)-4,4’diamine (NPB):ZnPc c-HTL. Meanwhile, we also investigate their mechanisms different from that in the case of using ZnPc as buffer layer. The specific analysis is based on the absorption spectra of the hole transporting material and current density–voltage characteristics of the corresponding hole-only devices.

Keywords: organic light emitting diodes composite hole transport layer zinc phthalocyanine

Received: 21 March 2013
Revised: 15 May 2013
Accepted manuscript online:

PACS:	73.40.Qv	(Metal-insulator-semiconductor structures (including semiconductor-to-insulator))
	73.61.-r	(Electrical properties of specific thin films)
	73.90.+f	(Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures)

Fund: Project supported by the National Key Basic Research and Development Program of China (Grant No. 2010CB327701) and the National Natural Science Foundation of China (Grant No. 61275033).

Corresponding Authors: Zhao Yi
E-mail: yizhao@jlu.edu.cn

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Guo Run-Da (郭闰达), Yue Shou-Zhen (岳守振), Wang Peng (王鹏), Chen Yu (陈宇), Zhao Yi (赵毅), Liu Shi-Yong (刘式墉) Increased performance of an organic light-emitting diode by employing a zinc phthalocyanine based composite hole transport layer 2013 Chin. Phys. B 22 127304

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Increased performance of an organic light-emitting diode by employing a zinc phthalocyanine based composite hole transport layer

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