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Proceedings Paper

Highly efficient low color temperature organic LED using blend carrier modulation layer
Author(s): Yao-Ching Hsieh; Szu-Hao Chen; Shih-Ming Shen; Ching-Chiun Wang; Chien-Chih Chen; Jwo-Huei Jou
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Paper Abstract

Color temperature (CT) of light has great effect on human physiology and psychology, and low CT light, minimizing melatonin suppression and decreasing the risk of breast, colorectal, and prostate cancer. We demonstrates the incorporation of a blend carrier modulation interlayer (CML) between emissive layers to improve the device performance of low CT organic light emitting diodes, which exhibits an external quantum efficiency of 22.7% and 36 lm W-1 (54 cd A-1) with 1880 K at 100 cd m-2, or 20.8% and 29 lm W-1 (50 cd A-1) with 1940 K at 1000 cd m-2. The result shows a CT much lower than that of incandescent bulbs, which is 2500 K with 15 lmW-1 efficiency, and even as low as that of candles, which is 2000 K with 0.1 lmW-1. The high efficiency of the proposed device may be attributed to its CML, which helps effectively distribute the entering carriers into the available recombination zones.

Paper Details

Date Published: 15 October 2012
PDF: 5 pages
Proc. SPIE 8419, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy, 84192C (15 October 2012); doi: 10.1117/12.974643
Show Author Affiliations
Yao-Ching Hsieh, National Tsinghua Univ. (Taiwan)
Szu-Hao Chen, Industrial Technology Research Institute (Taiwan)
Shih-Ming Shen, National Tsinghua Univ. (Taiwan)
Ching-Chiun Wang, Industrial Technology Research Institute (Taiwan)
Chien-Chih Chen, Industrial Technology Research Institute (Taiwan)
Jwo-Huei Jou, National Tsinghua Univ. (Taiwan)


Published in SPIE Proceedings Vol. 8419:
6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Sensing, Imaging, and Solar Energy
Yadong Jiang; Junsheng Yu; Zhifeng Wang, Editor(s)

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