Cr,In共掺杂MgGa_(2)O_(4)小尺寸近红外长余辉纳米颗粒的制备及发光性能  

Synthesis and Luminescence Properties of Cr,In Co-doped Small Size MgGa_(2)O_(4) Near-infrared Persistent Luminescence Nanoparticles

作　　者：孙雪峰 热娜古丽·阿不都热合曼 杨通胜 杨倩婷 SUN Xuefeng;RENAGUL Abdurahman*;YANG Tongsheng;YANG Qianting(Laboratory of Xinjiang Native Medicinal and Edible Plant Resources Chemistry,College of Chemistry and Environmental Science,Kashi University,Kashi 844006,China)

机构地区：[1]新疆特色药食用植物资源化学实验室,喀什大学化学与环境科学学院,喀什844006

出　　处：《高等学校化学学报》2022年第4期1-13,共13页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:21867014);新疆维吾尔自治区“天山青年”计划科技人才培养项目(批准号:2017Q086);喀什大学高层次人才科研启动经费(批准号:GCC18ZK-003)资助.

摘　　要：采用乙二醇辅助共沉淀法制备了小尺寸Cr,In共掺杂MgGa_(2)O_(4)(MGO∶Cr,In)近红外长余辉发光纳米粒子(Persistent luminescence nanoparticles,PLNPs),并考察了Cr,In共掺杂及煅烧温度对MGO晶体结构、余辉发光性质和尺寸的影响.结果表明,最优Cr,In共掺杂浓度分别为0.3%和0.02%,MGO∶Cr,In晶体属于Fd3m空间群,Cr,In共掺杂对纳米颗粒的结构无影响,平均粒径为(8.61±2.23)nm,分散性良好,最佳煅烧温度为700℃.并且,In掺杂可有效延长其余辉发光寿命,平均发光寿命(τ_(av))从49.33 s增大至52.89 s;荧光量子产率增高至44.9%;活化能E_(a)为(0.36±0.04)eV,具有良好的热稳定性;陷阱深度为0.696 eV.此外,该PLNPs分别在260 nm、410 nm和600 nm处有激发峰,表明UV光、蓝绿光以及红光皆可实现对其的激发,发射波长皆位于705 nm处,属于Cr^(3+)的^(2)E(^(2)G)→^(4)A_(2)(^(4)F)跃迁.该PLNPs在红色LED灯、光学储器件以及生物医学等领域具有巨大潜在应用价值.Cr,In co-doped MgGa_(2)O_(4) persistent luminescence nanoparticles(PLNPs)with small-size were prepared by ethylene glycol assisted co-precipitation.The influence of Cr,In co-doping and calcination temperature on the MGO crystal structure,afterglow luminescence properties and size were further investigated.The results showed that the optimal Cr,In co-doped concentrations were 0.3%and 0.02%,respectively,and the samples belonged to Fd3m space group,Cr,In co-doping had no effect on the structure of the samples.The PLNPs had a good water dispersibility with an average particle size of(8.61±2.23)nm and the optimum calcination temperature of 700℃.Moreover,the afterglow decay life was prolonged by In doping,and the average luminescence life(τ_(av))of the afterglow decay fitting curves increased from 49.33 s to 52.89 s with the QY increased to 44.9%.The activation energy(E_(a))was(0.36±0.04)eV.The PLNPs had a good thermal stability,and the trap depth was 0.696 eV.Moreover,the PLNPs had three excitation bands at 260,410 and 600 nm,respectively,which indicated that UV light,blue-green light and red light could be excited,and the emission wavelength was all at 705 nm,belonged to the 2 E(2 G)→4 A_(2)(4 F)transition of Cr^(3+).Therefore,the PLNPs had a great potential application value in red LED lamps,optical storage devices and biomedical fields.

关 键 词：共沉淀法 小尺寸 Cr In共掺杂 长余辉纳米颗粒 

分 类 号：O614[理学—无机化学]