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 +
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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