摘要
通过高温固相法制备了系列单掺杂SrLa_(1-x)GaO_(4)∶xDy^(3+)(x=0.01~0.07)白光发光荧光粉。利用XRD和SEM对样品粉末进行了物相和形貌分析,结果表明,1300℃下合成的Dy^(3+)单掺杂SrLaGaO_(4)基质荧光粉,具有良好的结晶度,其形状不规则,颗粒直径大小从1μm到30μm;用F-4700荧光分光光度仪测定了荧光粉的光致发光特性和衰减寿命。SrLaGaO_(4)∶Dy^(3+)荧光粉可被353 nm的紫外光有效激发,发射光谱由较强的蓝光发射(484 nm)和黄光发射(580 nm)构成,分别来自于Dy^(3+)的^(4)F_(9/2)→^(6)H_(15/2)的磁偶极跃迁和^(4)F_(9/2)→^(6)H_(13/2)的电偶极跃迁,平均衰减寿命分别为0.340 ms和0.341 ms。Dy^(3+)在基质中的最佳掺杂浓度为0.04,样品出现的浓度淬灭效应是来自于Dy^(3+)间交换相互作用。荧光粉SrLa_(0.96)GaO_(4)∶0.04Dy^(3+)在353 nm激发下,整体呈现白光发射,色坐标为(0.375,0.384),色温为4182 K。Dy^(3+)单掺杂SrLaGaO_(4)基质荧光粉在白光LED中具有潜在的应用价值。
A series of single-doped SrLa_(1-x)GaO_(4)∶xDy^(3+)(x=0.01~0.07) white light-emitting phosphors were prepared by a high-temperature solid-state method. The phase and morphology of the sample powders were analyzed by XRD and SEM. The results showed that the Dy^(3+) single-doped SrLaGaO_(4) matrix phosphors synthesized at 1300 ℃ had good crystallinity, irregular shapes and particle sizes ranging from 1 μm to 30 μm in diameter. The photoluminescence properties and decay lifetime of the phosphors were measured with an F-4700 spectrophotometer. The SrLaGaO_(4)∶Dy^(3+) phosphor can be effectively excited by ultraviolet light at 353 nm, and the emission spectrum is composed of strong blue light emission(484 nm) and yellow light emission(580 nm), which comes from the magnetic dipole transition ^(4)F_(9/2)→^(6)H_(15/2) of Dy^(3+) and the electric dipole transition of ^(4)F_(9/2)→^(6)H_(13/2). Corresponding average decay lifetimes are 0.340 ms and 0.341 ms. The optimal doping concentration of Dy^(3+) in the matrix is 0.04, the concentration quenching effect of the sample comes from the exchange interaction between Dy^(3+). The phosphor SrLa_(0.96)GaO_(4)∶0.04Dy^(3+) exhibits white light emission as a whole under excitation at 353 nm, a color coordinate of(0.375, 0.384) and a color temperature of 4182 K which is a warm tone. Dy^(3+) singly doped SrLaGaO_(4) host phosphors have potential application value in white LEDs.
作者
张恒
陈伟
姜锋
朱德生
ZHANG Heng;CHEN Wei;JIANG Feng;ZHU De-sheng(School of Physic and Optoelectronic Engineering,Yangtze University,Jingzhou 434023,China;School of Materials Science and Engineering,Central South University,Changsha 410083,China)
出处
《稀土》
CSCD
北大核心
2023年第6期28-37,I0003,共11页
Chinese Rare Earths
基金
荆州市自然科学研究专项(2020CB21-22)
湖北省教育厅科研计划项目(B2018027)。
作者简介
张恒(1997-),男,湖北大冶人,硕士研究生,主要从事稀土发光材料的合成及发光性能研究,E-mail:1204912591@qq.com;通讯作者:朱德生,副教授,E-mail:dszhu@yangtzeu.edu.cn。
