Physical Limitations of Phosphor layer thickness and concentration for White LEDs

Abstract Increasing phosphor layer thickness and concentration can enhance the lumen flux of white LED (W-LED). In this work, we found that increasing the phosphor layer thickness and concentration can increase its temperature, and there is also a maximum thickness and concentration beyond which the...

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Autores principales:	Cher Ming Tan, Preetpal Singh, Wenyu Zhao, Hao-Chung Kuo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5884d521804b4958837361ab4f5dbdc3
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spelling	oai:doaj.org-article:5884d521804b4958837361ab4f5dbdc32021-12-02T15:08:26ZPhysical Limitations of Phosphor layer thickness and concentration for White LEDs10.1038/s41598-018-20883-32045-2322https://doaj.org/article/5884d521804b4958837361ab4f5dbdc32018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-20883-3https://doaj.org/toc/2045-2322Abstract Increasing phosphor layer thickness and concentration can enhance the lumen flux of white LED (W-LED). In this work, we found that increasing the phosphor layer thickness and concentration can increase its temperature, and there is also a maximum thickness and concentration beyond which their increase will not lead to lumen increase, but only temperature increase. Higher thickness and higher concentration also results in warm light instead of White light. The maximum thickness and concentration are found to be limited by the scattering of light rays with higher % decrease of blue light rays than the yellow light rays. The results obtained in this work can also be used to compute the temperature and thermo-mechanical stress distribution of an encapsulated LED, demonstrating its usefulness to the design of encapsulated LED packages. Simulation software like ANSYS and TracePro are used extensively to verify the root cause mechanisms.Cher Ming TanPreetpal SinghWenyu ZhaoHao-Chung KuoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-14 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Cher Ming Tan Preetpal Singh Wenyu Zhao Hao-Chung Kuo Physical Limitations of Phosphor layer thickness and concentration for White LEDs
description	Abstract Increasing phosphor layer thickness and concentration can enhance the lumen flux of white LED (W-LED). In this work, we found that increasing the phosphor layer thickness and concentration can increase its temperature, and there is also a maximum thickness and concentration beyond which their increase will not lead to lumen increase, but only temperature increase. Higher thickness and higher concentration also results in warm light instead of White light. The maximum thickness and concentration are found to be limited by the scattering of light rays with higher % decrease of blue light rays than the yellow light rays. The results obtained in this work can also be used to compute the temperature and thermo-mechanical stress distribution of an encapsulated LED, demonstrating its usefulness to the design of encapsulated LED packages. Simulation software like ANSYS and TracePro are used extensively to verify the root cause mechanisms.
format	article
author	Cher Ming Tan Preetpal Singh Wenyu Zhao Hao-Chung Kuo
author_facet	Cher Ming Tan Preetpal Singh Wenyu Zhao Hao-Chung Kuo
author_sort	Cher Ming Tan
title	Physical Limitations of Phosphor layer thickness and concentration for White LEDs
title_short	Physical Limitations of Phosphor layer thickness and concentration for White LEDs
title_full	Physical Limitations of Phosphor layer thickness and concentration for White LEDs
title_fullStr	Physical Limitations of Phosphor layer thickness and concentration for White LEDs
title_full_unstemmed	Physical Limitations of Phosphor layer thickness and concentration for White LEDs
title_sort	physical limitations of phosphor layer thickness and concentration for white leds
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/5884d521804b4958837361ab4f5dbdc3
work_keys_str_mv	AT chermingtan physicallimitationsofphosphorlayerthicknessandconcentrationforwhiteleds AT preetpalsingh physicallimitationsofphosphorlayerthicknessandconcentrationforwhiteleds AT wenyuzhao physicallimitationsofphosphorlayerthicknessandconcentrationforwhiteleds AT haochungkuo physicallimitationsofphosphorlayerthicknessandconcentrationforwhiteleds
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Physical Limitations of Phosphor layer thickness and concentration for White LEDs

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