形貌可控的NaCaGd(WO4)3∶Eu^3+红色荧光粉的制备及发光性能  

Morphology⁃Controlled Synthesis and Luminescence Properties of Red⁃Emitting NaCaGd(WO4)3∶Eu^3+Phosphors

作　　者：王萧慧 李桂芳 卫云鸽 关旭峰 WANG Xiao-Hui;LI Gui-Fang;WEI Yun-Ge;GUAN Xu-Feng(School of Advanced Materials and Nano Technology,Xidian University,Xi′an 710071,China)

机构地区：[1]西安电子科技大学先进材料与纳米科技学院,西安710071

出　　处：《无机化学学报》2020年第10期1881-1890,共10页Chinese Journal of Inorganic Chemistry

基　　金：陕西省自然科学基金(No.2018JM5151)资助项目。

摘　　要：采用水热法成功合成了形貌可控的NaCaGd1-x(WO4)3∶xEu^3+红色荧光粉。系统地研究了初始溶液pH值、反应温度和Eu^3+掺杂浓度对NaCaGd1-x(WO4)3∶xEu^3+荧光粉物相结构、微观形貌和发光性能的影响。结果表明,当pH值为9、反应温度为180℃时,可合成单相四方晶系的NaCaGd(WO4)3,且颗粒微观形貌呈现分散性好、尺寸较均一的四方盘状纳米晶。在394 nm激发下,荧光粉显现典型的红光发射,其对应于Eu^3+的特征4f-4f跃迁。荧光粉发射光谱的强度随着pH值、反应温度及Eu^3+掺杂浓度的变化而变化。当pH=9、反应温度为180℃时,NaCaGd1-x(WO4)3∶xEu^3+(x=1)获得最佳发光强度。此外,研究了NaCaEu(WO4)3荧光粉的热稳定性,结果显示随着温度的升高,荧光粉发光强度逐渐降低。最后,通过理论计算得到荧光粉的色坐标和色纯度分别为(0.658,0.341)和96.1%,接近标准红色CIE坐标(0.673,0.327)。NaCaGd(WO4)3∶Eu^3+red phosphors with controllable morphology were synthesized via the hydrothermal method.The influences of pH value,reaction temperature and Eu^3+concentration on the crystal structure,morphology and photoluminescence properties of NaCaGd(WO4)3∶Eu^3+phosphors were investigated in detail.The results show that the pure tetragonal sheelite structure NaCaGd(WO4)3 with uniform tetragonal plate-like nanocrystallines was obtained when pH value was 9 and reaction temperature of 180℃.Under the excitation of 394 nm,the phosphors displayed a bright red emission corresponding to the characteristic 4f-4f transitions of Eu^3+,and the intensity of emission peak mainly depends on the pH value,the reaction temperature and Eu^3+doped concentration.The optimum photoluminescence performance is achieved for NaCaEu(WO4)3(x=1.0)phosphors synthesized at pH=9 under the reaction temperature 180℃.In addition,the thermal stability of the phosphors was analyzed under different ambient temperatures between 303 and 513 K.The result exhibits that the emission intensity of phosphor decreases with the increase of ambient temperature.Finally,the corresponding chromaticity coordinate and color purity were calculated to(0.658,0.341)and 96.1%,which is close to the standard CIE chromaticity coordiante values for red light(0.673,0.327).

关 键 词：水热法 发光 荧光粉 Eu^3+掺杂浓度 

分 类 号：O482.31[理学—固体物理]