Citation: Li L, Lin LIU, Mei-Xing HAN, Hui-Jun YANG, Hui-Ying LIU. Preparation and luminescent properties of ZnAl₂O₄∶Mn materials[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(6): 1113-1121. doi: 10.11862/CJIC.2023.071 shu

Preparation and luminescent properties of ZnAl₂O₄∶Mn materials

Institute of Chemical Technology, Inner Mongolia University of Technology, Hohhot 010051, China

Corresponding author: Li L, lvli1997@imut.edu.cn
Received Date: 13 October 2022
Revised Date: 21 April 2023

Figures(7)

In this work, a series of ZnAl₂O ₄∶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 ZnAl₂O ₄ 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.
- coprecipitation-calcination,
- ZnAl₂O₄:Mn,
- red light emission,
- co-doped,
- luminescent properties
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Preparation and luminescent properties of ZnAl₂O₄∶Mn materials