Improving the efficiency of OLEDs by utilizing metallophthalocyanines

Wallace C. H. Choy; Y. J. Liang; K. N. Hui; H. H. Fong

doi:10.1117/12.617641

9 October 2005 Improving the efficiency of OLEDs by utilizing metallophthalocyanines

Wallace C. H. Choy, Y. J. Liang, K. N. Hui, H. H. Fong

Proceedings Volume 5937, Organic Light-Emitting Materials and Devices IX; 59371Y (2005) https://doi.org/10.1117/12.617641
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Wallace C. H. Choy, Y. J. Liang, K. N. Hui, and H. H. Fong "Improving the efficiency of OLEDs by utilizing metallophthalocyanines", Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59371Y (9 October 2005); https://doi.org/10.1117/12.617641

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