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Preparation and luminescent properties of ZnAl2O4:Mn materials
Author NameAffiliationE-mail
Lü Li Institute of Chemical Technology, Inner Mongolia University of Technology, Hohhot 010051, China lvli1997@imut.edu.cn 
LIU Lin Institute of Chemical Technology, Inner Mongolia University of Technology, Hohhot 010051, China  
HAN Mei-Xing Institute of Chemical Technology, Inner Mongolia University of Technology, Hohhot 010051, China  
YANG Hui-Jun Institute of Chemical Technology, Inner Mongolia University of Technology, Hohhot 010051, Chin  
LIU Hui-Ying Institute of Chemical Technology, Inner Mongolia University of Technology, Hohhot 010051, China  
Abstract: In this work, a series of ZnAl2O4:xMn samples were successfully prepared by the co-precipitation and calcination methods. The micrographs and phases of powders were analyzed by scanning electron microscopy and X-ray diffraction, respectively. The octahedral position of[AlO6] in ZnAl2O4 with spinel structure can be effectively replaced by Mn4+. The photoluminescence excitation (PLE) spectra and photoluminescence emission (PL) spectra of ZnAl2O4:xMn with varying Mn4+ doping concentrations (molar ratios of Mn to Al) were investigated. The crystal structure of host material ZnAl2O4 is conducive to effective luminescence of Mn4+ at 680 nm. The optimum doping concentration of Mn4+ was 0.06%. The relationship between luminescence intensity and concentration was analyzed by the Dexter formula to explore the mechanism of concentration quenching. The energy transfer among the nearest neighbor ions leads to concentration quenching. To further improve the luminous intensity of Mn4+, seven metal ions (Li+, Na+, K+, Ca2+, Sr2+, Sn2+, and Ga3+) were co-doped with Mn4+ into the ZnAl2O4 crystal structure. PL spectra indicated that the co-doping effect could remarkably enhance the luminescent intensity of Mn4+. The relative prominent co-doping of Li+ and Ga3+ with Mn4+ enhanced the luminous intensity of Mn4+ by 0.6 times and doubled, respectively. Furthermore, the concentration quenching of Mn4+ is delayed.
Keywords: coprecipitation-calcination  ZnAl2O4:Mn  red light emission  co-doped  luminescent properties
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Lü Li,LIU Lin,HAN Mei-Xing,YANG Hui-Jun,LIU Hui-Ying.Preparation and luminescent properties of ZnAl2O4:Mn materials[J].Chinese Journal of Inorganic Chemistry,2023,39(6):1113-1121.
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Chinese Journal of Inorganic Chemistry