NaCa_(2)Mg_(2)(VO_(4))_(3)∶Eu^(3+)颜色可调荧光粉的熔盐法合成及其发光性能研究  

Molten Salt Synthesis of Color Tunable NaCa_(2-x)Mg_(2)(VO_(4))_(3)∶xEu^(3+)Phosphors and Their Luminescent Properties

作　　者：陈金润 陈梦玉 李子璇 李微[1] 楚楚 曹秀哲 翟永清[1] CHEN Jinrun;CHEN Mengyu;LI Zixuan;LI Wei;CHU Chu;CAO Xiuzhe;ZHAI Yongqing(College of Chemistry and Materials Science,Hebei University,Baoding 071002,China)

机构地区：[1]河北大学化学与材料科学学院,保定071002

出　　处：《人工晶体学报》2024年第1期90-96,共7页Journal of Synthetic Crystals

基　　金：国家自然科学基金(21804030);河北省自然科学基金(B2020201082);河北大学实验室开放项目基金(sy202250)。

摘　　要：以廉价的NaCl为熔盐,采用熔盐法合成了NaCa_(2-x)Mg_(2)(VO_(4))_(3)∶xEu^(3+)(0≤x≤0.10)系列颜色可调荧光粉,系统研究了合成条件、Eu^(3+)掺杂对样品结构及发光性能的影响。结果表明,反应温度为800℃、反应时间为0.5 h、原料与熔盐的质量比为1∶3是合成NaCa_(2)Mg_(2)(VO4)_(3)的适宜反应条件,所得样品为NaCa_(2)Mg_(2)(VO_(4))_(3)纯相,且结晶度高。样品微观形貌随着反应温度的升高由珊瑚状演变为表面光滑的不规则多面体。Eu^(3+)掺杂对NaCa_(2)Mg_(2)(VO_(4))_(3)的晶体结构影响较小,但对其发光性能影响较大。随着Eu^(3+)浓度(x)的增加,VO_(4)^(3-)的特征发射带强度逐渐减弱;而Eu^(3+)的特征发射峰强度先增大后减小,当x=0.06时,达到最大。故通过改变Eu^(3+)浓度,可对样品的发光颜色进行调制,从绿色可调制为黄绿色、黄色、黄白色、橙红色。荧光光谱与荧光寿命分析表明,NaCa_(2)Mg_(2)(VO_(4))_(3)∶Eu^(3+)体系中存在VO43-到Eu^(3+)的能量转移过程,能量转移效率约为23%;热稳定性分析结果表明,当温度从室温(298.15 K)升高到398.15 K时,NaCa_(1.94)Mg_(2)(VO_(4))_(3)∶0.06Eu^(3+)荧光粉在614 nm处的主发射峰强度可保留起始值的68.4%,表现出良好的热稳定性。A series of color tunable NaCa_(2-x)Mg_(2)(VO_(4))_(3)∶xEu^(3+)(0≤x≤0.10)phosphors were synthesized by molten salt method using cheap NaCl as molten salt.The effects of synthesis conditions and Eu^(3+)doping on the structure and luminescence properties of the samples were investigated in details.The results show that the optimum reaction conditions for the synthesis of NaCa_(2)Mg_(2)(VO_(4))_(3)are reaction temperature of 800℃,reaction time of 0.5 h and mass ratio of raw material to molten salt of 1∶3.The obtained samples are NaCa_(2)Mg_(2)(VO_(4))_(3)pure phase with higher crystallinity.The micromorphology of the samples changed from coral-like to smooth irregular polyhedron with the increase of temperature.Eu^(3+)doping has little effect on the crystal structure of NaCa_(2)Mg_(2)(VO_(4))_(3),but great effect on its luminescence properties.With the increase of Eu^(3+)concentration(x),the characteristic emission band intensity of VO_(4)^(3-) gradually decreases,while the characteristic emission peak intensity of Eu^(3+)first increases and then decreases,reaching the maximum when x=0.06.Therefore,the luminous color of the samples can be modulated by changing the Eu^(3+)concentration,from green to yellow-green,yellow,yellow-white and orange-red.According to the fluorescence spectrum and fluorescence lifetime analysis,it is confirmed that the energy transfer process of VO_(4)^(3-) to Eu^(3+)exists in NaCa_(2)Mg_(2)(VO_(4))_(3)∶Eu^(3+)phosphors,and the energy transfer efficiency is about 23%.The thermal stability analysis shows that when the temperature increases from room temperature(298.15 K)to 398.15 K,the retaining ratio of the main emission peak intensity of NaCa_(2)Mg_(1.94)(VO_(4))_(3)∶0.06Eu^(3+)phosphor at 614 nm is 68.4%,showing its good thermal stability.

关 键 词：钒酸盐 熔盐法 发光性能 白光LED 颜色可调荧光粉 铕离子掺杂 

分 类 号：O611.4[理学—无机化学]