Author(s): Zhang, XR (Zhang, Xinran); Zhang, S (Zhang, Shuo); Wang, GD (Wang, Guodong); Wang, YY (Wang, Yunyu); Liang, M (Liang, Meng); Zhan, T (Zhan, Teng); Wang, JX (Wang, Junxi); Li, JM (Li, Jinmin); Liu, ZQ (Liu, Zhiqiang); Yi, XY (Yi, Xiaoyan)
Source: OPTICAL ENGINEERING Volume: 59 Issue: 1 Article Number: 015104 DOI: 10.1117/1.OE.59.1.015104 Published: JAN 2020
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. (C) 2020 Society of Photo-Optical Instrumentation Engineers (SPIE)
Accession Number: WOS:000512378900025
ISSN: 0091-3286
eISSN: 1560-2303
Full Test: https://www.spiedigitallibrary.org/journals/optical-engineering/volume-59/issue-01/015104/Near-ultraviolet-chip-based-phosphor-converted-solar-spectrum-white-light/10.1117/1.OE.59.1.015104.full?SSO=1