Synthesis and Photoluminescent Property of $\text{MgO:Cr}^{3+}$ Powders

Trinh Thi Loan; Nguyen Ngoc Long; Le Hung Cuong

doi:10.15625/0868-3166/22/3/444

Synthesis and Photoluminescent Property of $\text{MgO:Cr}^{3+}$ Powders

Trinh Thi Loan, Nguyen Ngoc Long, Le Hung Cuong

Author affiliations

Authors

Trinh Thi Loan Faculty of Physics, Hanoi University of Science, VNU
Nguyen Ngoc Long Faculty of Physics, Hanoi University of Science, VNU
Le Hung Cuong Faculty of Physics, Hanoi University of Science, VNU

DOI:

https://doi.org/10.15625/0868-3166/22/3/444

Keywords:

MgO, Cr$^{3 }$, Synthesis, Photoluminescence

Abstract

MgO:Cr³⁺ powders with different dopant contents have been synthesized by sol-gel method using the following precursors: magnesium nitrate (Mg(NO₃)₂), chrome nitrate (Cr(NO$_3$)$_3$), and citric acid. The effect of the Cr$^{3+}$ concentration and heat-treating temperature on structural and optical properties of the synthesized samples has been studied. For the samples with the low Cr³⁺-dopant concentrations or low heat-treating temperature, the photoluminescent (PL) spectra consist of sharp lines assigned to the $^2$E $\to$ $^4$A$_2$ transition of ions Cr³⁺ in perfect octahedral symmetry sites. But for the samples with the high Cr$^{3+}$-dopant concentrations and undergone high heat-treating temperature, the PL spectra appear a broad emission bands, which is assigned to the $^4$T$_1\to ^4$A$_2$ transitions within the Cr$^{3+}$ ions in the MgO orthorhombic symmetry crystal field.

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Published

31-10-2012

How to Cite

[1]

T. T. Loan, N. N. Long and L. H. Cuong, Synthesis and Photoluminescent Property of $\text{MgO:Cr}^{3+}$ Powders, Comm. Phys. 22 (2012) 239. DOI: https://doi.org/10.15625/0868-3166/22/3/444.

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Issue

Vol. 22 No. 3 (2012)

Section

Papers

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