Candle light-style OLED: a plausibly human-friendly safe night light

Jwo-Huei Jou; Po-Wei Chen; Chun-Yu Hsieh; Ching-Chiun Wang; Chien-Chih Chen; F-C. Tung; Szu-Hao Chen; Yi-Shan Wang

doi:10.1117/12.2021591

27 September 2013 Candle light-style OLED: a plausibly human-friendly safe night light

Jwo-Huei Jou, Po-Wei Chen, Chun-Yu Hsieh , Ching-Chiun Wang, Chien-Chih Chen, F-C. Tung, Szu-Hao Chen, Yi-Shan Wang

Proceedings Volume 8829, Organic Light Emitting Materials and Devices XVII; 88291B (2013) https://doi.org/10.1117/12.2021591
Event: SPIE Organic Photonics + Electronics, 2013, San Diego, California, United States

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.

Citation Download Citation

Jwo-Huei Jou, Po-Wei Chen, Chun-Yu Hsieh , Ching-Chiun Wang, Chien-Chih Chen, F-C. Tung, Szu-Hao Chen, and Yi-Shan Wang "Candle light-style OLED: a plausibly human-friendly safe night light", Proc. SPIE 8829, Organic Light Emitting Materials and Devices XVII, 88291B (27 September 2013); https://doi.org/10.1117/12.2021591

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