Inorganic Chemicals Industry >
Study on synthesis and photoluminescence mechanism of CuAl2O4 and CuAl2O4:Cr phosphors
Received date: 2021-03-18
Online published: 2022-03-14
CuAl2O4 and CuAl2O4:Cr phosphors were prepared by a mild sol-gel method with tartaric acid as chelating agent.The X-ray powder diffraction results showed that the CuAl2O4 xerogel sintered at 800 ℃ exhibited a pure cubic CuAl2O4 phase with high crystallinity,CuAl2O4:Cr phosphor after sintering of xerogels was a mixed phase of CuAl2O4 and Cr2O3.The analysis of elemental composition and charge state showed that the CuAl2O4 and CuAl2O4:Cr phosphors did not contain other impurity elements,and there was a small amount of adsorbed oxygen in the two samples.Scanning electron microscope analysis showed that the particles of CuAl2O4 and CuAl2O4:Cr phosphors were approximately spherical,and each large particle was composed of many fine grains.The agglomeration phenomenon among CuAl2O4:Cr phosphor particles was obvious than that of CuAl2O4.The optical properties analysis found that the agglomeration of CuAl2O4:Cr phosphor particles resulted in a smaller optical band gap than that of CuAl2O4.CuAl2O4:Cr phosphor stimulated at 255 nm,and a strong fluorescence emission peak was obtained at 690 nm,which was mainly attributed to the transition between2Eg and4A2g in Cr3+.
Key words: sol-gel method; chelating agent; CuAl2O4; phosphor
Liping BAN , Min MA . Study on synthesis and photoluminescence mechanism of CuAl2O4 and CuAl2O4:Cr phosphors[J]. Inorganic Chemicals Industry, 2022 , 54(1) : 56 -61 . DOI: 10.19964/j.issn.1006-4990.2021-0162
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