MgAl2O4:Mg荧光粉的合成及其发光性能

doi:10.11901/1005.3093.2020.072

材料研究学报

2020, Vol. 34

Issue (10): 784-792 DOI: 10.11901/1005.3093.2020.072

研究论文

本期目录 | 过刊浏览

MgAl₂O₄:Mg荧光粉的合成及其发光性能

刘欣怡¹, 王仕发¹^,²^,³(

), 余先伦¹, 唐盛楠¹, 房雷鸣³, 雷力⁴

1.重庆三峡学院电子与信息工程学院万州 404000
2.重庆三峡学院三峡库区地质环境监测与灾害预警重点实验室万州 404000
3.中国工程物理研究院核物理与化学研究所绵阳 621900
4.四川大学原子和分子物理研究所成都 610065

Fabrication and Photoluminescence Properties of MgAl₂O₄: Mg Phosphors

LIU Xinyi¹, WANG Shifa¹^,²^,³(

), YU Xianlun¹, TANG Shengnan¹, FANG Leiming³, LEI Li⁴

1. School of Electronic and Information Engineering, Chongqing Three Gorges University, Wanzhou 404000, China
2. Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges;Reservoir Area, Chongqing Three Gorges University, Wanzhou 404000, China
3. Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang 621900, China
4. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China

引用本文:

刘欣怡, 王仕发, 余先伦, 唐盛楠, 房雷鸣, 雷力. MgAl₂O₄:Mg荧光粉的合成及其发光性能[J]. 材料研究学报, 2020, 34(10): 784-792.
Xinyi LIU, Shifa WANG, Xianlun YU, Shengnan TANG, Leiming FANG, Li LEI. Fabrication and Photoluminescence Properties of MgAl₂O₄: Mg Phosphors[J]. Chinese Journal of Materials Research, 2020, 34(10): 784-792.

全文: PDF(4131 KB) HTML

摘要:

用超声辅助聚丙烯酰胺凝胶法合成了MgAl₂O₄:Mg荧光粉。在MgAl₂O₄体系中引入的Mg金属颗粒抑制了MgAl₂O₄相的形成，在900℃及以上的温度烧结MgAl₂O₄:Mg干凝胶粉末，镁颗粒氧化成MgO。Mg金属颗粒的引入使MgAl₂O₄:Mg荧光粉的形貌由细小的纳米颗粒变为方便面型；MgAl₂O₄:Mg荧光粉的颜色由在600℃烧结时的暗棕色变为在800℃烧结时的白色，在1000℃烧结时白色变暗。随着烧结温度的提高MgAl₂O₄:Mg荧光粉的能带先增大后略微减小。引入镁颗粒使荧光光谱中位于395和425 nm的两个荧光峰淬灭，在650、656和680 nm出现三个新的荧光发射峰，且随着烧结温度的提高发光强度减弱。金属颗粒的表面等离子体共振导致MgAl₂O₄主晶格荧光淬灭，缺陷能级使MgAl₂O₄:Mg荧光粉产生了新的荧光发射峰。

关键词 ：复合材料, 铝酸镁, 聚丙烯酰胺凝胶法, 荧光, 表面等离子体共振

Abstract：

A novel MgAl₂O₄:Mg phosphor was prepared by ultrasonic assisted polyacrylamide gel method. When Mg metal particles were introduced into the MgAl₂O₄ system, the formation of MgAl₂O₄ phase was inhibited. When the xerogel powder MgAl₂O₄:Mg was sintered at 900℃ or above, the incorporated Mg-particles are oxidized to be MgO. The introduction of Mg-particles greatly changed the morphology of MgAl₂O₄:Mg phosphors, namely from tiny nanoparticles to instant noodles-like. The results show that the sintering temperature has great influence on the color, light absorption capacity, energy band E_g and photoluminescence properties of MgAl₂O₄:Mg phosphors. The color of MgAl₂O₄:Mg phosphors changes from dark brown for sintering at 600℃ to bright white at 800℃ and then to light white at 1000℃. With the increase of sintering temperature the E_g value of MgAl₂O₄:Mg phosphors increased first and then decreased slightly. The photoluminescence spectra show that three new photoluminescence emission peaks located at 650, 656 and 680 nm are observed when the excitation wavelength is 325 nm. The photoluminescence intensity decreased with the increasing of sintering temperature. The fluorescence emission peaks at 395 and 425 nm of host lattice MgAl₂O₄ were quenched. The surface plasmon resonance (SPR) of Mg metal particles led to the fluorescence quenching of MgAl₂O₄ host lattice, and the defect energy level can produce a new fluorescence emission band at 635~690 nm of MgAl₂O₄:Mg phosphors.

Key words： composite MgAl₂O₄ polyacrylamide gel method fluorescence surface plasmon resonance

收稿日期: 2020-03-09

ZTFLH:

TB321

基金资助:重庆市自然科学基金(cstc2019jcyj-msxmX0310);重庆市教委科技项目(KJQN201901);重庆市教委科技项目(KJZD-M201901201);重庆三峡学院人才引进项目(09924601);重庆三峡学院重大培育课题(18ZDPY01)

作者简介: 刘欣怡，女，1998年生，本科生

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图1 MgAl2O4:Mg荧光粉的制备流程

图2 MgAl2O4:Mg干凝胶粉末在不同温度烧结后的产物和MgAl2O4的XRD图谱

图3 MgAl2O4:Mg干凝胶粉末在不同温度烧结后产物的FTIR图谱

图4 MgAl2O4:Mg干凝胶粉末在800℃烧结后产物的SEM照片

图5 MgAl2O4:Mg干凝胶粉末在不同温度烧结后产物的紫外可见漫反射光谱和紫外可见吸收光谱

表1 MgAl2O4:Mg干凝胶粉末在不同温度烧结后产物的色度参数和Eg值

图6 MgAl2O4:Mg干凝胶粉末在不同温度烧结后产物的实物照片

图7 MgAl2O4:Mg干凝胶粉末在不同温度烧结后产物的Eg值及其与烧结温度的关系

图8 MgAl2O4:Mg干凝胶粉末在800℃烧结后产物的荧光光谱

图9 MgAl2O4:Mg干凝胶粉末在800℃烧结后产物的色度

图10 荧光强度与烧结温度的关系

图11 MgAl2O4:Mg荧光粉的发光机理

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