RCa_2Mg_2(VO_4)_3(R=Li,K,Na)荧光粉的制备及发光性能研究

Preparation and luminescence properties of RCa_2Mg_2(VO_4)_3(R=Li, K, Na) phosphors

采用高温固相法合成了RCa2Mg2(VO4)3(R=Li,K,Na)自激活系列荧光粉,并用X射线衍射仪和荧光分光光度计对合成样品的结构和发光性能进行了表征。结果表明:在750℃下煅烧得到的RCa2Mg2(VO4)3荧光粉具有较好的晶体结构。在331 nm的紫外光激发下,RCa2Mg2(VO4)3荧光粉在491 nm处具有较强的宽峰发射,其中Na Ca2Mg2(VO4)3的发光强度最好。Li Ca2Mg2(VO4)3、KCa2Mg2(VO4)3、Na Ca2Mg2(VO4)3的色坐标分别为(0.245,0.392)、(0.265,0.425)、(0.211,0.326),位于蓝绿光区。Eu3+掺杂后,Na Ca2Mg2(VO4)3:Eu3+样品光谱图中620 nm处出现Eu3+的发射峰,有效促使Na Ca2Mg2(VO4)3色坐标从蓝绿区(0.211,0.326)移到近白光区(0.260,0.322)。

A series of self-activated RCa2Mg2（VO4）3 （R=Li, K, Na） phosphors were successfully prepared by high temperature solid state reaction. The structure and luminescence properties of as-prepared samples were characterized by X-ray diffraction and fluorescence spectrophotometer. The results show that the optimal calcination temperature of RCa2Mg2（VO4）3 （R=Li, K, Na） phosphors is 750℃2M.g U2（pVoOn4 e）x3c （iRta=tLioin, K at, 3 N3a1） n pmho,s RpChoars exhibit an excellent broadband emission which located at 491 nm, and NaCa2Mg2（VO4）3 phosphor has the highest luminescence intensity among all samples. The chromaticity coordinates of LiCa2Mg2（VO4）3, KCa2Mg2（VO4）3and NaCa2Mg2（VO4）3are （0.245, 0.392）, （0.265, 0.425）, （0.211, 0.326）, respectively. After Eu^3＋ doping, an obvious emission located at 620 nm appears in the spectra of NaCa2Mg2（VO4）3：Eu^3＋, and the chromaticity coordinates is changed to （0.260, 0.322） with near white light from （0.211, 0.326）.