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Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors
Red-emitting Mn(4+)-doped fluorides are a promising class of materials to improve the color rendering and luminous efficacy of white light-emitting diodes (w-LEDs). For w-LEDs, the luminescence quenching temperature is very important, but surprisingly no systematic research has been conducted to und...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6106983/ https://www.ncbi.nlm.nih.gov/pubmed/30839606 http://dx.doi.org/10.1038/s41377-018-0013-1 |
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author | Senden, Tim van Dijk-Moes, Relinde J.A. Meijerink, Andries |
author_facet | Senden, Tim van Dijk-Moes, Relinde J.A. Meijerink, Andries |
author_sort | Senden, Tim |
collection | PubMed |
description | Red-emitting Mn(4+)-doped fluorides are a promising class of materials to improve the color rendering and luminous efficacy of white light-emitting diodes (w-LEDs). For w-LEDs, the luminescence quenching temperature is very important, but surprisingly no systematic research has been conducted to understand the mechanism for thermal quenching in Mn(4+)-doped fluorides. Furthermore, concentration quenching of the Mn(4+) luminescence can be an issue but detailed investigations are lacking. In this work, we study thermal quenching and concentration quenching in Mn(4+)-doped fluorides by measuring luminescence spectra and decay curves of K(2)TiF(6):Mn(4+) between 4 and 600 K and for Mn(4+) concentrations from 0.01% to 15.7%. Temperature-dependent measurements on K(2)TiF(6):Mn(4+) and other Mn(4+)-doped phosphors show that quenching occurs through thermally activated crossover between the (4)T(2) excited state and (4)A(2) ground state. The quenching temperature can be optimized by designing host lattices in which Mn(4+) has a high (4)T(2) state energy. Concentration-dependent studies reveal that concentration quenching effects are limited in K(2)TiF(6):Mn(4+) up to 5% Mn(4+). This is important, as high Mn(4+) concentrations are required for sufficient absorption of blue LED light in the parity-forbidden Mn(4+) d–d transitions. At even higher Mn(4+) concentrations (>10%), the quantum efficiency decreases, mostly due to direct energy transfer to quenching sites (defects and impurity ions). Optimization of the synthesis to reduce quenchers is crucial for developing more efficient highly absorbing Mn(4+) phosphors. The present systematic study provides detailed insights into temperature and concentration quenching of Mn(4+) emission and can be used to realize superior narrow-band red Mn(4+) phosphors for w-LEDs. |
format | Online Article Text |
id | pubmed-6106983 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-61069832018-08-30 Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors Senden, Tim van Dijk-Moes, Relinde J.A. Meijerink, Andries Light Sci Appl Article Red-emitting Mn(4+)-doped fluorides are a promising class of materials to improve the color rendering and luminous efficacy of white light-emitting diodes (w-LEDs). For w-LEDs, the luminescence quenching temperature is very important, but surprisingly no systematic research has been conducted to understand the mechanism for thermal quenching in Mn(4+)-doped fluorides. Furthermore, concentration quenching of the Mn(4+) luminescence can be an issue but detailed investigations are lacking. In this work, we study thermal quenching and concentration quenching in Mn(4+)-doped fluorides by measuring luminescence spectra and decay curves of K(2)TiF(6):Mn(4+) between 4 and 600 K and for Mn(4+) concentrations from 0.01% to 15.7%. Temperature-dependent measurements on K(2)TiF(6):Mn(4+) and other Mn(4+)-doped phosphors show that quenching occurs through thermally activated crossover between the (4)T(2) excited state and (4)A(2) ground state. The quenching temperature can be optimized by designing host lattices in which Mn(4+) has a high (4)T(2) state energy. Concentration-dependent studies reveal that concentration quenching effects are limited in K(2)TiF(6):Mn(4+) up to 5% Mn(4+). This is important, as high Mn(4+) concentrations are required for sufficient absorption of blue LED light in the parity-forbidden Mn(4+) d–d transitions. At even higher Mn(4+) concentrations (>10%), the quantum efficiency decreases, mostly due to direct energy transfer to quenching sites (defects and impurity ions). Optimization of the synthesis to reduce quenchers is crucial for developing more efficient highly absorbing Mn(4+) phosphors. The present systematic study provides detailed insights into temperature and concentration quenching of Mn(4+) emission and can be used to realize superior narrow-band red Mn(4+) phosphors for w-LEDs. Nature Publishing Group UK 2018-05-23 /pmc/articles/PMC6106983/ /pubmed/30839606 http://dx.doi.org/10.1038/s41377-018-0013-1 Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Senden, Tim van Dijk-Moes, Relinde J.A. Meijerink, Andries Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors |
title | Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors |
title_full | Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors |
title_fullStr | Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors |
title_full_unstemmed | Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors |
title_short | Quenching of the red Mn(4+) luminescence in Mn(4+)-doped fluoride LED phosphors |
title_sort | quenching of the red mn(4+) luminescence in mn(4+)-doped fluoride led phosphors |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6106983/ https://www.ncbi.nlm.nih.gov/pubmed/30839606 http://dx.doi.org/10.1038/s41377-018-0013-1 |
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