Shen, L.-S.; Wu, H.-Y.; Hsiao, L.-J.; Shih, C.-H.; Hsu, J.-C. LED Light Improved by an Optical Filter to Visible Solar-Like Light with High Color Rendering. Coatings2021, 11, 763.
Shen, L.-S.; Wu, H.-Y.; Hsiao, L.-J.; Shih, C.-H.; Hsu, J.-C. LED Light Improved by an Optical Filter to Visible Solar-Like Light with High Color Rendering. Coatings 2021, 11, 763.
Shen, L.-S.; Wu, H.-Y.; Hsiao, L.-J.; Shih, C.-H.; Hsu, J.-C. LED Light Improved by an Optical Filter to Visible Solar-Like Light with High Color Rendering. Coatings2021, 11, 763.
Shen, L.-S.; Wu, H.-Y.; Hsiao, L.-J.; Shih, C.-H.; Hsu, J.-C. LED Light Improved by an Optical Filter to Visible Solar-Like Light with High Color Rendering. Coatings 2021, 11, 763.
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.
Keywords
LED; solar-like light; optical coating; color rendering index; D65
Subject
PHYSICAL SCIENCES, Acoustics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
