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Proceedings Paper

Candle light-style OLED: a plausibly human-friendly safe night light
Author(s): Jwo-Huei Jou; Po-Wei Chen; Chun-Yu Hsieh ; Ching-Chiun Wang; Chien-Chih Chen; F-C. Tung; Szu-Hao Chen; Yi-Shan Wang
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Paper Abstract

Candles emit sensationally-warm light with a very-low color-temperature, comparatively most suitable for use at night. In response to the need for such a human-friendly night light, we demonstrate the employment of a high number of candle light complementary organic emitters to generate mimic candle light based on organic light emitting diode (OLED). One resultant candle light-style OLED shows a very-high color rendering index, with an efficacy at least 300 times that of candles or twice that of an incandescent bulb. The device can be fabricated, for example, by using four candle light complementary emitters, namely: red, yellow, green, and sky-blue phosphorescent dyes, vacuum-deposited into two emission layers, separated by a nano-layer of carrier modulation material to maximize both the desirable very-high color rendering index and energy efficiency, while keeping the blue emission very low and red emission high to obtain the desirable low color temperature. With different layer structures, the OLEDs can also show color tunable between that of candle light and dusk-hue. Importantly, a romantic sensation giving and supposedly physiologically-friendly candle light-style emission can hence be driven by electricity in lieu of the hydrocarbon-burning and greenhouse gas releasing candles that were invented 5,000 years ago.

Paper Details

Date Published: 27 September 2013
PDF: 11 pages
Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88291B (27 September 2013); doi: 10.1117/12.2021591
Show Author Affiliations
Jwo-Huei Jou, National Tsing Hua Univ. (Taiwan)
Po-Wei Chen, National Tsing Hua Univ. (Taiwan)
Chun-Yu Hsieh , National Tsing Hua Univ. (Taiwan)
Ching-Chiun Wang, Industrial Technology Research Institute (Taiwan)
Chien-Chih Chen, Industrial Technology Research Institute (Taiwan)
F-C. Tung, Industrial Technology Research Institute (Taiwan)
Szu-Hao Chen, Industrial Technology Research Institute (Taiwan)
Yi-Shan Wang, Industrial Technology Research Institute (Taiwan)

Published in SPIE Proceedings Vol. 8829:
Organic Light Emitting Materials and Devices XVII
Franky So; Chihaya Adachi, Editor(s)

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