MgAl2O4:Mg荧光粉的合成及其发光性能  

Fabrication and Photoluminescence Properties of MgAlO:Mg Phosphors

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作  者:刘欣怡 王仕发 余先伦[1] 唐盛楠[1] 房雷鸣 雷力[4] LIU Xinyi;WANG Shifa;YU Xianlun;TANG Shengnan;FANG Leiming;LEI Li(School of Electronic and Information Engineering,Chongqing Three Gorges University,Wanzhou 404000,China;Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges,Reservoir Area,Chongqing Three Gorges University,Wanzhou 404000,China;Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang 621900,China;Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China)

机构地区:[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

出  处:《材料研究学报》2020年第10期784-792,共9页Chinese Journal of Materials Research

基  金:重庆市自然科学基金(cstc2019jcyj-msxmX0310);重庆市教委科技项目(KJQN201901,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)。

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。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 Mg Al2O4: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 Eg 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 Egvalue 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.

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 

分 类 号:TB321[一般工业技术—材料科学与工程]

 

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