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Proceedings Paper

Very low color-temperature organic light-emitting diodes for lighting at night
Author(s): Jwo-Huei Jou; Ming-Chun Tang; Pin-Chu Chen; Szu-Hao Chen; Shih-Ming Shen; Chien-Chih Chen; Ching-Chiun Wang; Chien-Tien Chen
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Paper Abstract

Light sources with low color temperature (CT) are essential for their markedly less suppression effect on the secretion of melatonin, and high power efficiency is crucial for energy-saving. To provide visual comfort, the light source should also have a reasonably high color rendering index (CRI). In this report, we demonstrate the design and fabrication of low CT and high efficiency organic light-emitting diodes. The best resultant device exhibits a CT of 1,880 K, much lower than that of incandescent bulbs (2,000-2,500 K) and even as low as that of candles, (1,800-2,000 K), a beyond theoretical limit external quantum efficiency 22.7 %, and 36.0 lm/W at 100 cd/m 2. The high efficiency of the proposed device may be attributed to its interlayer, which helps effectively distribute the entering carriers into the available recombination zones.

Paper Details

Date Published: 17 December 2011
PDF: 9 pages
Proc. SPIE 8312, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy III, 83120D (17 December 2011); doi: 10.1117/12.902714
Show Author Affiliations
Jwo-Huei Jou, National Tsing Hua Univ. (Taiwan)
Ming-Chun Tang, National Tsing Hua Univ. (Taiwan)
Pin-Chu Chen, National Tsing Hua Univ. (Taiwan)
Szu-Hao Chen, National Tsing Hua Univ. (Taiwan)
Shih-Ming Shen, National Tsing Hua Univ. (Taiwan)
Chien-Chih Chen, Industrial Technology Research Institute (Taiwan)
Ching-Chiun Wang, Industrial Technology Research Institute (Taiwan)
Chien-Tien Chen, National Tsing Hua Univ. (Taiwan)

Published in SPIE Proceedings Vol. 8312:
Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy III
Min Gu, Editor(s)

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