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Jou, J. - H., Hsieh, C. - Y., Tseng, J. - R., Peng, S. - H., Jou, Y. - C., Hong, J. H., et al. (2013). Candle Light-Style Organic Light-Emitting Diodes. Adv. Funct. Mater., 23(21), 2750–2757.
Abstract: In response to the call for a physiologically-friendly light at night that shows low color temperature, a candle light-style organic light emitting diode (OLED) is developed with a color temperature as low as 1900 K, a color rendering index (CRI) as high as 93, and an efficacy at least two times that of incandescent bulbs. In addition, the device has a 80% resemblance in luminance spectrum to that of a candle. Most importantly, the sensationally warm candle light-style emission is driven by electricity in lieu of the energy-wasting and greenhouse gas emitting hydrocarbon-burning candles invented 5000 years ago. This candle light-style OLED may serve as a safe measure for illumination at night. Moreover, it has a high color rendering index with a decent efficiency.