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Proceedings Paper

Improving the efficiency of OLEDs by utilizing metallophthalocyanines
Author(s): Wallace C. H. Choy; Y. J. Liang; K. N. Hui; H. H. Fong
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Paper Abstract

In this paper, the effects of hole injection layer (HIL) on the performance of typically used tris-(8-hydroxyquinoline) aluminum (Alq3) based OLEDs have been investigated. Three different HIL materials were used: copper phthalocyanine (CuPc), magnesium phthalocyanine (MgPc) and zinc phthalocyanine (ZnPc). The Metallophthalocyanines (MPcs) will be used to construct single hole injection layer (HIL) and double HIL (d-HIL). In the OLEDs, Alq3 acts as the emitting layer and electron transport layer. Although d-HIL structures show higher efficiency than that of the reference device, the highest current efficiency ~ 4.02 cd/A corresponds to the 15 nm ZnPc HIL device. Compared to an current efficiency of ~3.29 cd/A and a power efficiency of ~0.99 lm/W (at 100 cd/m2 luminance) of the reference device, an 15 nm ZnPc HIL device has ~22% higher current efficiency and ~67% higher power efficiency. The reasons for the improvements will be discussed.

Paper Details

Date Published: 9 October 2005
PDF: 9 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59371Y (9 October 2005); doi: 10.1117/12.617641
Show Author Affiliations
Wallace C. H. Choy, The Univ. of Hong Kong (Hong Kong China)
Y. J. Liang, The Univ. of Hong Kong (Hong Kong China)
K. N. Hui, The Univ. of Hong Kong (Hong Kong China)
H. H. Fong, The Univ. of Hong Kong (Hong Kong China)
Cornell Univ. (United States)


Published in SPIE Proceedings Vol. 5937:
Organic Light-Emitting Materials and Devices IX
Zakya H. Kafafi; Paul A. Lane, Editor(s)

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