Red Mn4+ -Doped Fluoride Phosphors: Why Purity Matters

ACS Applied Materials & Interfaces
Reinert VerstraetePhilippe F Smet

Abstract

Traditional light sources, e.g., incandescent and fluorescent lamps, are currently being replaced by white light-emitting diodes (wLEDs) because of their improved efficiency, prolonged lifetime, and environmental friendliness. Much effort has recently been spent to the development of Mn4+-doped fluoride phosphors that can enhance the color gamut in displays and improve the color rendering index, luminous efficacy of the radiation, and correlated color temperature of wLEDs used for lighting. Purity, stability, and degradation of fluoride phosphors are, however, rarely discussed. Nevertheless, the typical wet chemical synthesis routes (involving hydrogen fluoride (HF)) and the large variety of possible Mn valence states often lead to impurities that drastically influence the performance and stability of these phosphors. In this article, the origins and consequences of impurities formed during synthesis and aging of K2SiF6:Mn4+ are revealed. Both crystalline impurities such as KHF2 and ionic impurities such as Mn3+ are found to affect the phosphor performance. While Mn3+ mainly influences the optical absorption behavior, KHF2 can affect both the optical performance and chemical stability of the phosphor. Moisture leads to decompos...Continue Reading

References

Oct 2, 2009·The Journal of Chemical Physics·Marta N Sanz-Ortiz, Fernando Rodríguez
May 20, 2014·Dalton Transactions : an International Journal of Inorganic Chemistry·Xianyu JiangYuexiao Pan
Jan 3, 2015·The Review of Scientific Instruments·S LeyreP Hanselaer
Jul 28, 2015·Angewandte Chemie·Hoang-Duy NguyenRu-Shi Liu
Jan 14, 2016·The Journal of Physical Chemistry Letters·Chun Che LinRu-Shi Liu
Apr 23, 2016·ACS Applied Materials & Interfaces·Ye JinRu-Shi Liu
Feb 14, 2017·Nature Materials·Yoon Hwa KimWon Bin Im
Apr 26, 2017·Nature Materials·Philippe F Smet, Jonas J Joos
Jul 12, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Zhaofeng YangQin Wang
Dec 7, 2017·ACS Applied Materials & Interfaces·Ya-Yun ZhouQin-Yuan Zhang
Jun 2, 2017·Light, Science & Applications·Sofie AbePhilippe F Smet

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Citations

Jan 5, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Feng HongXiangting Dong
Jun 3, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·José Miranda de CarvalhoHermi Felinto de Brito
Dec 21, 2019·ACS Applied Materials & Interfaces·Ya ZhuoJakoah Brgoch
Jan 6, 2022·Dalton Transactions : an International Journal of Inorganic Chemistry·Bojana MilićevićMingmei Wu

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