The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles

Abstract Phosphor converters for solid state lighting applications experience a strong thermal stress under high-excitation power densities. The recent interest in laser diode based lighting has made this issue even more severe. This research presents an effective approach to reduce the thermal quen...

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Autores principales:	Akvilė Zabiliūtė-Karaliūnė, Justina Aglinskaitė, Prancis̆kus Vitta
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1cf7697c1edf4d9ebff46e3e3799354b
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spelling	oai:doaj.org-article:1cf7697c1edf4d9ebff46e3e3799354b2021-12-02T17:04:36ZThe reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles10.1038/s41598-021-86249-42045-2322https://doaj.org/article/1cf7697c1edf4d9ebff46e3e3799354b2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86249-4https://doaj.org/toc/2045-2322Abstract Phosphor converters for solid state lighting applications experience a strong thermal stress under high-excitation power densities. The recent interest in laser diode based lighting has made this issue even more severe. This research presents an effective approach to reduce the thermal quenching effect and damage of laser-excited phosphor-silicone converters using thermally conductive hexagonal boron nitride (hBN) particles. Herein, the samples are analyzed by employing phosphor thermometry based on the photoluminescence decay time, and thermo-imaging techniques. The study shows that hBN particle incorporation increases the thermal conductivity of a phosphor-silicone mixture up to 5 times. It turns out, that the addition of hBN to the Eu $$^{2+}$$ 2 + doped chalcogenide-silicone converters can increase the top-limit excitation power density from 60 to 180 W cm $$^{-2}$$ - 2 , thus reaching a 2.5 times higher output. Moreover, it is shown that the presence of hBN in Ce $$^{3+}$$ 3 + activated garnet phosphor converters, may increase the output power by up to 1.8 times and that such converters can withstand 218 W cm $$^{-2}$$ - 2 excitation. Besides, hBN particles are also found to enhance the stability of the converters chromaticity and luminous efficacy of radiation. This means that the addition of hBN particles into silicone-based phosphor converter media is applicable in a wide range of different areas, in particular, the ones requiring a high optical power output density.Akvilė Zabiliūtė-KaraliūnėJustina AglinskaitėPrancis̆kus VittaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Akvilė Zabiliūtė-Karaliūnė Justina Aglinskaitė Prancis̆kus Vitta The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles
description	Abstract Phosphor converters for solid state lighting applications experience a strong thermal stress under high-excitation power densities. The recent interest in laser diode based lighting has made this issue even more severe. This research presents an effective approach to reduce the thermal quenching effect and damage of laser-excited phosphor-silicone converters using thermally conductive hexagonal boron nitride (hBN) particles. Herein, the samples are analyzed by employing phosphor thermometry based on the photoluminescence decay time, and thermo-imaging techniques. The study shows that hBN particle incorporation increases the thermal conductivity of a phosphor-silicone mixture up to 5 times. It turns out, that the addition of hBN to the Eu $$^{2+}$$ 2 + doped chalcogenide-silicone converters can increase the top-limit excitation power density from 60 to 180 W cm $$^{-2}$$ - 2 , thus reaching a 2.5 times higher output. Moreover, it is shown that the presence of hBN in Ce $$^{3+}$$ 3 + activated garnet phosphor converters, may increase the output power by up to 1.8 times and that such converters can withstand 218 W cm $$^{-2}$$ - 2 excitation. Besides, hBN particles are also found to enhance the stability of the converters chromaticity and luminous efficacy of radiation. This means that the addition of hBN particles into silicone-based phosphor converter media is applicable in a wide range of different areas, in particular, the ones requiring a high optical power output density.
format	article
author	Akvilė Zabiliūtė-Karaliūnė Justina Aglinskaitė Prancis̆kus Vitta
author_facet	Akvilė Zabiliūtė-Karaliūnė Justina Aglinskaitė Prancis̆kus Vitta
author_sort	Akvilė Zabiliūtė-Karaliūnė
title	The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles
title_short	The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles
title_full	The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles
title_fullStr	The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles
title_full_unstemmed	The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles
title_sort	reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hbn particles
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/1cf7697c1edf4d9ebff46e3e3799354b
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The reduction of the thermal quenching effect in laser-excited phosphor converters using highly thermally conductive hBN particles

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