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| Home > Publications database > Tuning the crystal structure, optical band gap and persistent luminescence performance of a Cr$^{3+}$ -doped LiGa$_5$O$_8$ spinel by adding aluminium and indium |
| Home > Publications database > Tuning the crystal structure, optical band gap and persistent luminescence performance of a Cr$^{3+}$ -doped LiGa$_5$O$_8$ spinel by adding aluminium and indium |
| Journal Article | PUBDB-2026-02815 |
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2026
Soc.
London
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Please use a persistent id in citations: doi:10.1039/D6DT00337K doi:10.3204/PUBDB-2026-02815
Abstract: The possibility of tuning the optical band gap, crystal structure and persistent luminescenceperformance of Cr3+-doped LiGa5O8 spinel by partially replacing Ga with Al and/or In has beenstudied extensively. For this purpose, a series of Cr3+-doped Li(Ga1-x-yAlxIny)5O8 (x = 0…0.5;y = 0…0.1) microcrystalline phosphors were synthesised using a conventional solid-statereaction method and characterised by powder X-ray diffraction, SEM-EDX and luminescencetechniques. The DFT-based electronic structure calculations were carried out for the sameLi(Ga1-x-yAlxIny)5O8 compositions, and the results were compared with the experimental ones.Based on the studies performed, the mechanism of Al and In incorporation into the LiGa5O8spinel structure, as well as the tuning of the crystal lattice parameters, local structure of M3+(M = Ga, Al, In) cations and optical band gap of the material have been established. Themulticentre structure and the broadening of the local structural disorder of the octahedrallycoordinated Cr3+ centres observed in this case have been confirmed by the high-resolution, lowtemperaturephotoluminescence measurements. Band gap engineering through alterations in thechemical composition of the LiGa5O8 spinel, as well as the depth of the native point defectsPage 1 of 34 Dalton TransactionsDalton Transactions Accepted ManuscriptOpen Access Article. Published on 05 May 2026. Downloaded on 5/7/2026 3:04:36 PM.This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.View Article OnlineDOI: 10.1039/D6DT00337Kresponsible for charge trapping, allows for the efficient tuning of the thermoluminescent andpersistent luminescent properties of Li(Ga1-x-yAlxIny)5O8:Cr3+ phosphors. Thus, the roomtemperaturepersistent luminescence performance of the phosphors modified by the addition ofAl and annealing in an oxygen-free atmosphere was increased threefold compared to thepristine LiGa5O8:Cr3+ phosphor synthesised under the same conditions.
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