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Proceedings Paper

The mechanism and effective connecting structure for tandem OLEDs
Author(s): Chieh-Wei Chen; Elbert Hsing-En Wu; Chih-Wei Chu; Chung-Chih Wu; Yang Yang
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Paper Abstract

The concept of tandem organic light-emitting devices (OLEDs) provides a pathway for developing highly stable and efficient OLEDs. The connecting structure that bridges adjacent light-emitting units, substantially affects the device performance of tandem OLEDs. In this letter, we introduce an effective connecting structure in which an ultrathin middle metal layer is sandwiched between efficient electron- and hole-injection layers for the tandem OLEDs, which in essence, avoids the use of reactive metals during fabrication. Two-unit tandem OLEDs with such connecting structure exhibit less than double the driving voltage, yet more than double the efficiency, more saturated emission color, and longer operational lifetime compared to those of single-unit devices. A model based on a hypothesis of energy level pinning effect has been proposed as the mechanism of the connecting structure in the tandem devices. This model is also consistent with the results obtained from the photovoltaic effect measurements in tandem OLEDs.

Paper Details

Date Published: 9 October 2005
PDF: 8 pages
Proc. SPIE 5937, Organic Light-Emitting Materials and Devices IX, 593727 (9 October 2005); doi: 10.1117/12.626288
Show Author Affiliations
Chieh-Wei Chen, Univ. of California, Los Angeles (United States)
National Taiwan Univ. (Taiwan)
Elbert Hsing-En Wu, Univ. of California, Los Angeles (United States)
Chih-Wei Chu, Univ. of California, Los Angeles (United States)
Chung-Chih Wu, National Taiwan Univ. (Taiwan)
Yang Yang, Univ. of California, Los Angeles (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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