摘要
以L-半胱氨酸为硫源,通过共沉淀法成功合成了Gd2O2SO4∶Tb^3+纳米荧光粉。采用X射线衍射(XRD)、差热热重分析(DSC-TG)、傅里叶变换红外光谱仪(FTIR)、场发射扫描电子显微镜(FESEM)和光致发光(PL)光谱对产物的结构、形貌和发光性能进行表征。研究pH值、反应物的摩尔比和Tb3+浓度对产物相组成、形貌和发光性能的影响。结果表明,当Gd^3+∶SO4^2-=2∶3、pH=7.5时,合成的前驱体在800℃煅烧2h可获得单相Gd2O2SO4纳米粉体。该粉体呈近球形,团聚较严重,平均粒径约为30nm。在230nm紫外光激发下,Gd2O2SO4∶Tb^3+纳米荧光粉具有优异的发光性能,主发射峰位于544nm,归属于Tb3+的5D4→7F5跃迁。当Tb^3+浓度达到12%时,Gd2O2SO4∶Tb^3+发光强度达到最大值。Gd2O2SO4∶Tb^3+衰减过程符合双e指数衰减行为,对应的荧光寿命为τ1=0.177μs,τ2=0.119μs。
Gd 2O 2SO 4∶Tb^3+ nanophosphors were successfully synthesized via co-precipitation method by using L-cysteine as sulfur source.The structure, morphology and photoluminescence properties of the product were characterized by X-ray Diffractometry (XRD), Differential Scanning Calorimetry Thermogravimetric (DSC-TG), Fourier Transform Infrared Spectroscopy (FTIR), Field Emission Scanning Electron Microscopy (FESEM), and Photoluminescence Spectra (PL). The influences of pH value, the mole ratio of reactants and Tb 3+ doping concentration on phase composition, morphology and photoluminescence properties of the samples were investigated. The results indicate that the single phase Gd 2O 2SO 4 can be obtained by calcining the precursor at 800 ℃ for 2 h with the mole ratio of Gd^3+∶SO4^2-=2∶3 and pH=7.5. The morphology of Gd 2O 2SO 4 is near-spherical and has a relatively serious agglomeration with an average diameter of product is around 30 nm.Under 230 nm ultraviolet (UV) light excitation, the Gd 2O 2SO 4:Tb^3+ nanophosphors exhibit good photoluminescence and a strong emission peak at around 544 nm can be observed, which is attributed to the 5D 4→ 7F 5 transition of Tb^3+ ions. When the concentration of Tb 3+ ions reaches 12%, the Gd2O2SO4∶Tb^3+ nanophosphor presents the highest luminescence. The decay process of Gd 2O 2SO 4∶Tb^3+ nanophosphor conforms to the double exponential decay and the corresponding fluorescent time are τ 1 =0.177 μs and τ 2=0.119 μs, respectively.
作者
黄婷
许广西
连景宝
吴念初
张雪
何娇
HUANG Ting;XU Guangxi;LIAN Jingbao;WU Nianchu;ZHANG Xue;HE Jiao(School of Mechanical Engineering, Liaoning Shihua University, Fushun 113001, Liaoning,China;New Functional Materials Laboratory, Liaoning Shihua University Fushun 113001, Liaoning,China)
出处
《有色金属工程》
CAS
北大核心
2019年第6期17-23,共7页
Nonferrous Metals Engineering
基金
国家自然科学基金资助项目(51701090)
辽宁省自然科学基金(20170540582)
国家级大学生创新创业训练计划项目(201710148000031)~~
关键词
硫酸氧化钆
纳米荧光粉
共沉淀法
光致发光
gadolinium oxysulfate
nanophosphor
co-precipitation
photoluminescence
