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 candlelight complementary organic emitters to generate and mimic candlelight based on organic light emitting diode (OLED). One resultant candlelight style OLED shows a very-high color rendering index (CRI), with an efficacy at least 300 times that of a candle or at least two times that of an incandescent bulb. The device can be fabricated, for example, by using four candlelight complementary emitters: red, yellow, green, and sky-blue phosphorescent dyes. These dyes, in the present system, can be vacuum deposited into two emission layers that are separated by a nanolayer of carrier modulation material that is used to maximize very high CRI and energy efficiency. A nano carrier modulation layer also played a significant role in maintaining the low blue emission and high-red emission, the low color temperature of device was obtained. Importantly, a romantic sensation giving and supposedly physiologically friendly candlelight style emission can hence be driven by electricity in lieu of hydrocarbon burning and greenhouse gas-releasing candles that were invented 5000 years ago.
Highlights
Latest studies on light sources mainly focus on the development of energy-saving and environmentally friendly illumination devices.[1]
We demonstrate a candlelight style organic lightemitting diode (OLED) device with a yellowish orange emission with Commission International de l’Eclairage (CIE) 1931 coordinates tunable around (0.52, 0.43) with a Color temperature (CT) of 2000 K, closely matching the (0.52, 0.42) and 1914 K of a white candle studied
A yellowish orange emission was observed as the glass was shone by the candlelight style OLED, closely resembling that shone by the white candle
Summary
Latest studies on light sources mainly focus on the development of energy-saving and environmentally friendly illumination devices.[1] Amongst, light-emitting diode (LED) and organic lightemitting diode (OLED) solid-state lighting[2,3,4,5,6] technologies have already achieved power efficiency (PE) near to that of fluorescent tubes. Color temperature (CT) of light plays an important role in human physiology and psychology.[7,8,9,10,11,12,13,14] Numerous studies have shown that high CT-lighting source and intensive white light or light with strongblue emission drastically suppresses the secretion of melatonin (MLT), an oncostatic hormone. The color temperature ranges from 1847 to 2626 K, with a 1914 K at the brightest spot
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