13 September 2012 OLED-based physiologically-friendly very low-color temperature illumination for night
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Abstract
Numerous medical research studies reveal intense white or blue light to drastically suppress at night the secretion of melatonin (MLT), a protective oncostatic hormone. Lighting devices with lower color-temperature (CT) possess lesser MLT suppression effect based on the same luminance, explaining why physicians have long been calling for the development of lighting sources with low CT or free from blue emission for use at night to safeguard human health. We will demonstrate in the presentation the fabrication of OLED devices with very-low CT, especially those with CT much lower than that of incandescent bulbs (2500K) or even candles (2000K). Without any light extraction method, OLEDs with an around 1800K CT are easily obtainable with an efficacy of 30 lm/W at 1,000 nits. To also ensure high color-rendering to provide visual comfort, low CT OLEDs composing long wavelength dominant 5-spectrum emission have been fabricated. While keeping the color-rendering index as high as 85 and CT as low as 2100K, the resulting efficacy can also be much greater than that of incandescent bulbs (15 lm/W), proving these low CT OLED devices to be also capable of being energy-saving and high quality. The color-temperature can be further decreased to 1700K or lower upon removing the undesired short wavelength emission but on the cost of losing some color rendering index. It is hoped that the devised energy-saving, high quality low CT OLED could properly echo the call for a physiologically-friendly illumination for night, and more attention could be drawn to the development of MLT suppression-less non-white light.
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Jwo-Huei Jou, Shih-Ming Shen, Ming-Chun Tang, Pin-Chu Chen, Szu-Hao Chen, Yi-Shan Wang, Chien-Chih Chen, Ching-Chun Wang, Chun-Yu Hsieh, Chin-Chiao Lin, Chien-Tien Chen, "OLED-based physiologically-friendly very low-color temperature illumination for night", Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 847619 (13 September 2012); doi: 10.1117/12.927778; https://doi.org/10.1117/12.927778
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