5^th Global Chemistry Congress

Mostly adopted artificial lightings yield blue or violet emission included short wavelength lights, which impose tremendously high threat to human health, ecosystems, night sky, and artifacts. Nowadays, the priority of research and development in lighting technologies is not only to maximize the power efficiency, but also extend to reduce the unwanted phototoxicity and enhance the light-quality. Organic light- emitting diode (OLED) devices can be designed and fabricated with least emission in the violet and deep-blue range which enables a human- and ecologically-friendly lighting with high efficiency and high light-quality. Furthermore, its spectrum tailoring flexibility offers numerous innovative designs in lighting fixtures. Highly efficient candle light-style OLED can be fabricated by using multiple low color temperature blackbody-radiation complementary organic emitters. The resultant orange-white light shows a color temperature as low as that of candles or oil lamps, ~1,800-1,900 K, and is free from mercury, flickering, glare, ultraviolet, and infrared emission, as comparing with the modern electricity-driven lighting sources. Along with its high device efficacy and high spectrum resemblance index with respect to natural light, candlelight OLED can be considered as an ideal candidate for indoor as well as outdoor illumination measure. It is reasonable to state that the candlelight OLED is conducive to human- health and ecological system and will trigger lighting renaissance with blue-hazard free, orange-white light that candles have been providing since 5,000 years ago or oil lamps since 12,000 years ago.

 

 

 

Figure 1. Candlelight OLED can emit blue-hazard free, low color temperature, orange-white light, like that of oil lamps invented 12,000 years ago or candles invented 5,000 years ago.

 

Recent Publications:

 

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3. http://www.darksky.org
4. Monico, L. et al. (2013) Degradation Process of Lead Chromate in Paintings by Vincent van Gogh Studied by Means of Spectromicroscopic Methods. 3. Synthesis, Characterization, and Detection of Different Crystal Forms of the Chrome Yellow Pigment. S. Anal. Chem. 85 (2): 851–859.
5. Jou, J. H. et al. (2013) Candle Light-Style Organic Light-Emitting Diodes. Adv. Funct. Mater. 23: 2750–2757.
6. Jou, J. H. et al. (2014) Enabling a blue-hazard free general lighting based on candle light-style OLED. Optics Express 23 (11): A577.
7. Jou, J. H. et al., (2016) Wet-process feasible candlelight OLED,”
J. Mater. Chem. C 4, 6070-6077.