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Proceedings Paper

Recovery behavior of mixed layer organic light-emitting devices
Author(s): Shun-Wei Liu; Juen-Kai Wang; Chih-Chien Lee; Chin-Ti Chen; Yih Chang
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Paper Abstract

In this report, we have investigated electroluminsecence (EL) characteristics and field-induced recovery of organic light-emitting devices (OLEDs) with a mixed emitting layer (EML). The mixed EML which is composed of a mixture of a hole transport layer (HTL), N,N'-diphenyl-N,N'-bis(1,1'-biphenyl)-4,4'-diamine (NPB), and an electron transport layer (ETL), bis(10-hydroxybenzo[h]quinolinato) beryllium (Bebq2), was fabricated by co-evaporation. Evident recovery of luminance-voltage characteristic was observed in the mixed device. It is explained by a dipole rearrangement model. The lifetime of this mixed layer OLED can reach 348 min. with initial luminance of 11,000 cd/m2 which is two times better that of the comparable heterojunction device.

Paper Details

Date Published: 8 October 2005
PDF: 8 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 59371B (8 October 2005); doi: 10.1117/12.609813
Show Author Affiliations
Shun-Wei Liu, Institute of Chemistry, Academia Sinica (Taiwan)
Juen-Kai Wang, National Taiwan Univ. (Taiwan)
Institute of Atomic and Molecular Sciences, Academia Sinica (Taiwan)
Chih-Chien Lee, National Taiwan Univ. of Science and Technology (Taiwan)
Chin-Ti Chen, Institute of Chemistry, Academia Sinica (Taiwan)
Yih Chang, RiTdisplay Corp. (Taiwan)

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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