2026年 04期

摘要(Abstract)：

为了探究铝酸镁中余辉的起源及其发光机制，采用溶液燃烧法制备铝酸镁纳米晶，并系统研究其物相结构、光致发光及余辉特性；通过X射线衍射、扫描与透射电子显微分析、X射线光电子能谱及热释光测试对样品的晶体结构与缺陷特性进行表征。结果表明，在波长为255 nm的紫外光激发下，铝酸镁纳米晶的光致发光谱呈现出双子带发射特征，2个发射峰对应的光子能量分别为3.41 eV(波长为363.6 nm)和3.18 eV(波长为389.9 nm)；在高压汞灯照射终止后，样品表现出持续约20.5 min的紫外余辉，其衰减光谱同样由位于波长为360、390 nm处的双子带组成；铝酸镁晶体的紫外余辉是由氧空位与阳离子空位共同作用所致。

关键词(KeyWords)：铝酸镁; 紫外余辉; 光致发光; 热释光; 氧空位

基金项目(Foundation):国家自然科学基金项目(52302005); 江苏省研究生科研与实践创新计划(KYCX23_3184)

作者(Author): 陈蒙蒙，杜金恒，黄远明

DOI: 10.13349/j.cnki.jdxbn.20260428.001

参考文献(References)：

[1] Li Yang, Gecevicius M, Qiu Jianrong. Long persistent phosphors: from fundamentals to applications[J]. Chemical Society Reviews, 2016, 45(8): 2090.

[2] Li Hao, Ye Shuai, Guo Jiaqing, et al. The design of room-temperature-phosphorescent carbon dots and their application as a security ink[J]. Journal of Materials Chemistry C, 2019, 7 (34): 10605.

[3] Wang Jianguo, Gu Xinggui, Ma Huili, et al. A facile strategy for realizing room temperature phosphorescence and single molecule white light emission[J]. Nature Communications, 2018, 9(1): 2963.

[4] Matsuzawa T, Aoki Y, Takeuchi N, et al. A new long phosphorescent phosphor with high brightness, SrAl₂O₄: Eu²⁺ , Dy³⁺[J]. Journal of the Electrochemical Society, 1996, 143(8): 2670.

[5] Palilla F C, Levine A K, Tomkus M R. Fluorescent properties of alkaline earth aluminates of the type MAl₂O₄ activated by divalent europium[J]. Journal of the Electrochemical Society, 1968, 115 (6): 642.

[6] Maia A S, Stefani R, Kodaira C A, et al. Luminescent nanopar ticles of MgAl₂O₄ : Eu, Dy prepared by citrate sol-gel method[J]. Optical Materials, 2008, 31(2): 440.

[7] Xu Xuhui, Wang Yuhua, Gong Yu, et al. Synthesis and afterglow properties of MgAl₂O₄ : Eu²⁺ , Dy³⁺ nanopowders[J]. Journal of Nanoscience and Nanotechnology, 2011, 11(11): 9851.

[8] Jia Dong, Yen Wenmo. Enhanced VK³⁺ center afterglow in MgAl₂O₄ by doping with Ce³⁺ [J]. Journal of Luminescence, 2003, 101(1/2): 115.

[9] Zhai Baogai, Huang Yuanming. Green afterglow of undoped SrAl₂O₄ [J]. Nanomaterials, 2021, 11(9): 2331.

[10] Zhai Baogai, Huang Yuanming. Blue afterglow of undoped CaAl₂O₄ nanocrystals [J]. Europhysics Letters, 2019, 127 (1): 17001.

[11] Zhai Baogai, Huang Yuanming. Bluish-green afterglow and blue photoluminescence of undoped BaAl₂O₄ [J]. RSC Advances, 2023, 13(44): 31112.

[12] Zhai Baogai, Huang Yuanming. Doping concentration dependent photoluminescence and afterglow of Eu²⁺ doped CaAl₂O₄ for in sight into the afterglow mechanisms[J]. Physica B: Condensed Matter, 2022, 64690(1): 414284.

[13] Zhai Baogai, Chen Mengmeng, Huang Yuanming. Photolumines cence and afterglow of Dy³⁺ doped CaAl2O4 derived via sol-gel combustion[J]. RSC Advances, 2022, 12(49): 31757.

[14] Yamashita N, Hamada T, Takada M, et al. Photoluminescence and thermoluminescence of MgSO₄, CaSO₄, SrSO₄ and BaSO₄ powder phosphors activated with Tb³⁺ [J]. Japanese Journal of Applied Physics, 2001, 40(12): 6732.

[15] Yamanaka T, Takéuchi Y. Order-disorder transition in MgAl₂O₄ spinel at high temperatures up to 1 700 ℃ [J]. Zeitschrift für Kristallographie: Crystalline Materials, 1983, 165(1/2/3/4): 65.

[16] Zhai Baogai, Ma Qinglan, Li Xiao, et al. Blue-green afterglow of BaAl2O4 : Dy³⁺ phosphors [J]. Materials Research Bulletin, 2016, 75(1): 1-6.

[17] Maphiri V M, Dejene B F, Motaung T E, et al. The effects of varying the Eu³⁺ concentration on the structural and optical prop erties of Mg_1.5Al₂O_4.5 : x% Eu³⁺ (0≤x≤2) nanophosphors pre pared by sol-gel method[J]. Nanomaterials and Nanotechnology, 2018, 8: 1.

[18] Artemyeva E S, Barinov D S, Atitar F M, et al. Luminescence of photoactivated pristine and Cr-doped MgAl₂O₄ spinel[J]. Chem ical Physics Letters, 2015, 626: 6-10.

[19] Sawai S, Uchino T. Visible photoluminescence from MgAl₂O₄ spinel with cation disorder and oxygen vacancy[J]. Journal of Applied Physics, 2012, 112(10): 103.

[20] Raj S S, Gupta S K, Grover V, et al. MgAl₂O₄ spinel: synthesis, carbon incorporation and defect-induced luminescence [J]. Journal of Molecular Structure, 2015, 1089(1/2/3): 81.

[21] Lorincz A, Puma M, James F J, et al. Thermally stimulated processes involving defects in γ- and X-irradiated spinel (MgAl₂O₄) [J]. Journal of Applied Physics, 1982, 53(2): 927-932.

[22] Zhai Baogai, Li Xiao, et al. Blue photoluminescence and cyan colored afterglow of undoped SrSO₄ nanoplates[J]. ACS Omega, 2021, 6(15): 10129.

[23] Maia A S, Stefani R, Kodaira C A, et al. Luminescent nanopar ticles of MgAl₂O₄ : Eu, Dy prepared by citrate sol-gel method [J]. Optical Materials, 2008, 31(2): 440-444.

[24] Chung K S, Lee J I, Kim J L. A computer program for the de convolution of the thermoluminescence glow curves by employing the interactive trap model[J]. Radiation Measurements, 2012, 47(9): 766.