Very low color-temperature organic light-emitting diodes for lighting at night

Jwo-Huei Jou; Ming-Chun Tang; Pin-Chu Chen; Szu-Hao Chen; Shih-Ming Shen; Chien-Chih Chen; Ching-Chiun Wang; Chien-Tien Chen

doi:10.1117/12.902714

17 December 2011 Very low color-temperature organic light-emitting diodes for lighting at night

Jwo-Huei Jou, Ming-Chun Tang, Pin-Chu Chen, Szu-Hao Chen, Shih-Ming Shen, Chien-Chih Chen, Ching-Chiun Wang, Chien-Tien Chen

Author Affiliations +

Proceedings Volume 8312, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy III; 83120D (2011) https://doi.org/10.1117/12.902714
Event: SPIE/OSA/IEEE Asia Communications and Photonics, 2011, Shanghai, China

Abstract

Light sources with low color temperature (CT) are essential for their markedly less suppression effect on the secretion of melatonin, and high power efficiency is crucial for energy-saving. To provide visual comfort, the light source should also have a reasonably high color rendering index (CRI). In this report, we demonstrate the design and fabrication of low CT and high efficiency organic light-emitting diodes. The best resultant device exhibits a CT of 1,880 K, much lower than that of incandescent bulbs (2,000-2,500 K) and even as low as that of candles, (1,800-2,000 K), a beyond theoretical limit external quantum efficiency 22.7 %, and 36.0 lm/W at 100 cd/m ². The high efficiency of the proposed device may be attributed to its interlayer, which helps effectively distribute the entering carriers into the available recombination zones.

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Jwo-Huei Jou, Ming-Chun Tang, Pin-Chu Chen, Szu-Hao Chen, Shih-Ming Shen, Chien-Chih Chen, Ching-Chiun Wang, and Chien-Tien Chen "Very low color-temperature organic light-emitting diodes for lighting at night", Proc. SPIE 8312, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy III, 83120D (17 December 2011); https://doi.org/10.1117/12.902714

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