Ba_(3)(VO_(4))_(2):Sm^(3+)荧光粉的熔盐法合成及其温度传感特性  

Synthesis of Ba_(3)(VO_(4))_(2):Sm^(3+) phosphor by molten salt method and its temperature sensing characteristics

作　　者：陈金润 李子璇 焦利鑫 李微[1] 楚楚 曹秀哲 翟永清[1] CHEN Jinrun;LI Zixuan;JIAO Lixin;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,河北保定071002

出　　处：《功能材料》2024年第2期2207-2214,共8页Journal of Functional Materials

基　　金：国家自然科学基金(22175052);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：采用熔盐法成功合成了Ba_(3-x)(VO_(4))_(2):xSm^(3+)(x=0.02~0.16)一系列荧光粉,探讨了合成条件、Sm^(3+)掺杂对样品结构和发光性能的影响,并探究了样品的温度传感性能。结果表明:合成样品的适宜反应条件是煅烧温度为900℃、煅烧时间为1 h、原料与熔盐质量比为1∶3,所得样品相纯度和结晶度均较高。样品微观形貌呈片状,厚度约1.5~3 mm。在318 nm激发下,Ba_(3-x)(VO_(4))_(2):xSm^(3+)的发射光谱中可同时观察到VO_(4)^(3-)基团的宽带发射和Sm^(3+)的特征发射,样品的发光颜色集中在黄白光区域。随着Sm^(3+)掺杂浓度(x)从0.02增大到0.16,Sm^(3+)的特征发射峰强度呈现出先升后降的变化趋势,当x=0.10时,发射峰强度达到最高值。导致其浓度猝灭的主要原因是电偶极-电偶极(d-d)相互作用。在298~473 K的温度范围内,Ba_(2.9)(VO_(4))_(2):0.10Sm^(3+)荧光粉中Sm^(3+)(652 nm)和VO_(4)^(3-)基团(504 nm)发射的荧光强度比呈现明显的温度依赖性,其最大绝对灵敏度为0.36 K^(-1),最大相对灵敏度为1.99%K^(-1)。因此,Sm^(3+)掺杂Ba_(3)(VO_(4))_(2)的荧光粉具有优异的温度传感性能,在非接触式光学测温中具有潜在的应用价值。A series of Ba_(3-x)(VO_(4))_(2):xSm^(3+)(x=0.02-0.16) phosphors were synthesized using the molten salt method with KCl as the salt.The effects of synthesis conditions as well as Sm^(3+) doping concentration on the phase structure and luminescence properties of the sample were investigated in detail.The temperature sensing characteristics of the sample were also studied.The optimum reaction conditions for synthesizing the sample are calcination temperature of 900 ℃,calcination time of 1 h,and a mass ratio of raw materials to molten salt of 1∶3.The obtained sample has high phase purity and crystallinity.The micromorphology of the sample is lamellar with a thickness of about 1.5-3 mm.Upon the ultraviolet excitation of 318 nm,the broad emission from the VO_(4)^(3-) groups and characteristic emissions from Sm^(3+) can be observed simultaneously in the emission spectra of Ba_(3-x)(VO_(4))_(2):xSm^(3+) phosphors,with the emission colors concentrated in the yellow-white light region.With the increase of Sm^(3+) doping concentration(x) from 0.02 to 0.16,the intensity of the characteristic emission peak of Sm^(3+) first increases and then decreases,reaching its maximum value when x=0.10.The dominant mechanism for the concentration quenching in Ba_(3-x)(VO_(4))_(2):xSm^(3+) phosphors is attributed to the dipole-dipole(d-d) interaction.Moreover,for Ba_(2.9)(VO_(4))_(2):0.10Sm^(3+) phosphors,it is found that the fluorescence intensity ratio of Sm^(3+)(652 nm) and VO_(4)^(3-) groups(504 nm) shows a significant temperature dependence in the temperature range of 298-473 K.Its maximum absolute and relative temperature sensor sensitivities are 0.36/K and 1.99%/K,respectively.The results indicate that Sm^(3+) doped Ba_(3)(VO_(4))_(2) phosphors exhibit excellent temperature sensing performance and potential applications in non-contact optical thermometry.

关 键 词：钒酸盐 熔盐法 钐离子 发光 光学测温 

分 类 号：O482.31[理学—固体物理]