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High contrast ratio organic light-emitting devices based on CuPC as electron transport material

Authors :
Lee, Jiun-Haw
Liao, Chi-Chih
Hu, Pier-Jy
Chang, Yih
Source :
Synthetic Metals. Aug2004, Vol. 144 Issue 3, p279-283. 5p.
Publication Year :
2004

Abstract

In this paper, a high-contrast-ratio organic light-emitting device (OLED) of high brightness is demonstrated. In this device, reflection from the cathode is reduced by inserting a copper-phthalocyanine (CuPC) layer between the emitting layer (EML) and the cathode called the Black Cathodeā„¢ technique. The absorption and the destructive interference effect caused by this layer lead to the decrease of the ambient light. With the same injection current density at 6 mA/cm2, the contrast ratio of this device increases from 1.9 to 2.5 under 1000 lx illumination, when compared with a conventional device. Although the thickness of this device increases by 54.5%, its driving voltage is nearly the same as that of a conventional device. This result implies the high electron mobility in the inserted CuPC layer. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
03796779
Volume :
144
Issue :
3
Database :
Academic Search Index
Journal :
Synthetic Metals
Publication Type :
Academic Journal
Accession number :
13470414
Full Text :
https://doi.org/10.1016/j.synthmet.2004.04.007