Low-power-consumption and long-lifetime OLED with a high Tg n-type organic transport material

Meng-Hsiu Wu; Jiun-Haw Lee; Man-Kit Leung; Chi-Chih Liao; Yih Chang

doi:10.1117/12.559561

10 November 2004 Low-power-consumption and long-lifetime OLED with a high Tg n-type organic transport material

Meng-Hsiu Wu, Jiun-Haw Lee, Man-Kit Leung, Chi-Chih Liao, Yih Chang

Proceedings Volume 5519, Organic Light-Emitting Materials and Devices VIII; (2004) https://doi.org/10.1117/12.559561
Event: Optical Science and Technology, the SPIE 49th Annual Meeting, 2004, Denver, Colorado, United States

Abstract

In this paper, we demonstrated an organic light emitting device (OLED) of low driving voltage, high current efficiency and long lifetime by using an n-type organic material as the electron transport layer (ETL). Such a layer is composed of a large alkali metal, i.e. Cesium (Cs), doped into the organic material. Cs atom is heavy and hard to diffuse into the emitting layer (EML) material that decreases the metal quenching and increase the operation lifetime. 2,9-dimethyl-4,7-diphenyl 1,10- phenanthrolin (BCP) and 2,5-diaryl-1,3,4-oxadiazoles (OXD) were used as the host organic material. OXD is thermally stable and exhibits a high glass transition temperature (Tg) of 147°C that can further increase the operation lifetime. The resistivity of those doped materials is about 3x10⁵ Ω-cm that is two orders of magnitude lower than the resistivity of the pure organic materials. Compared with the conventional LiF/Al device, about two-volt reduction in driving voltage was observed. Current efficiency is also increased due to better carrier balance. Operation lifetimes of metal dopant devices are longer than that of the conventional device especially by using OXD as the host of the ETL.

Citation Download Citation

Meng-Hsiu Wu, Jiun-Haw Lee, Man-Kit Leung, Chi-Chih Liao, and Yih Chang "Low-power-consumption and long-lifetime OLED with a high Tg n-type organic transport material", Proc. SPIE 5519, Organic Light-Emitting Materials and Devices VIII, (10 November 2004); https://doi.org/10.1117/12.559561

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