Working Paper Article Version 1 This version is not peer-reviewed

LED Light Improved by an Optical Filter to Visible Solar-Like Light With High Color Rendering

Version 1 : Received: 31 May 2021 / Approved: 1 June 2021 / Online: 1 June 2021 (09:46:55 CEST)

How to cite: Shen, L.; Wu, H.; Hsiao, L.; Shih, C.; Hsu, J. LED Light Improved by an Optical Filter to Visible Solar-Like Light With High Color Rendering. Preprints 2021, 2021060012 Shen, L.; Wu, H.; Hsiao, L.; Shih, C.; Hsu, J. LED Light Improved by an Optical Filter to Visible Solar-Like Light With High Color Rendering. Preprints 2021, 2021060012

Abstract

A typical white-light light-emitting diode (LED) can achieve a sunlight-like spectral profile in the visible spectrum by means of using an optical filter, with an inverted transmission profile to the white LED, fabricated using a deposition coating process. The unfiltered white LED generates white light by mixing light emitted by a blue LED (450 nm) with emission from the yellow phosphorescence excited by the blue light and differs significantly from the characteristics of the full-spectrum natural light. In this study, the spectral characteristics of the filtered LED light can be improved to reach a general color rendering index value (Ra) of 95.6 at the D65.

Subject Areas

LED; solar-like light; optical coating; color rendering index; D65

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