21 January 2020 Near-ultraviolet chip-based phosphor-converted solar-spectrum white light-emitting diode
Xinran Zhang, Shuo Zhang, Guodong Wang, Yunyu Wang, Meng Liang, Teng Zhan, Junxi Wang, Jinmin Li, Zhiqiang Liu, Xiaoyan Yi
Author Affiliations +
Funded by: National Key R&D Program of China, National Key R&D Program, Guangzhou Science & Technology Project of Guangdong Province, China, National Natural Science Foundation of China (NSFC), National Natural Science Foundation of China, Henan Provincial Department of Science and Technology Project
Abstract

As efficient artificial light sources, nitride-based light-emitting diodes (LEDs) have been widely used. However, III nitride white light-emitting diodes (WLEDs) are mostly fabricated by combining a blue LED chip with yellow phosphors, which results in inevitable problems, such as low color-rendering index (CRI) and detrimental effect to human eyes. As a solution for healthy lighting, we report a strategy to produce a WLED with an emission spectrum perfectly matched with natural daylight. By utilizing near-ultraviolet LED chips and a mixture of blue/cyan/amber/red phosphors, a CRI (Ra) of 97.9 is achieved for the WLEDs at a correlated color temperature of around 5000 K. The resemblance ratio of these solar-spectrum WLEDs with the standard normalized daylight spectrum (5000 K) is found to as high as 93.4%. Residual UV light in the normalized spectrum is <5  %  . The method will benefit the development of high-efficiency healthy artificial light sources.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Xinran Zhang, Shuo Zhang, Guodong Wang, Yunyu Wang, Meng Liang, Teng Zhan, Junxi Wang, Jinmin Li, Zhiqiang Liu, and Xiaoyan Yi "Near-ultraviolet chip-based phosphor-converted solar-spectrum white light-emitting diode," Optical Engineering 59(1), 015104 (21 January 2020). https://doi.org/10.1117/1.OE.59.1.015104
Received: 14 September 2019; Accepted: 2 January 2020; Published: 21 January 2020
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Cited by 1 scholarly publication.
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KEYWORDS
Light emitting diodes

Near ultraviolet

Ultraviolet radiation

Radium

Blue light emitting diodes

Optical engineering

Light sources

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