近紫外光激发单一基质白光荧光粉Ca_3Y_2Si_3O_(12)∶Dy^(3+)的制备及发光特性

Preparation and Luminescent Properties of Single Host White Phosphors Ca_3Y_2Si_3O_(12)∶ Dy^(3+) Excited by Near UV Light

采用高温固相法在1 400℃下合成了近紫外光激发的单一基质白光荧光粉Ca3Y2-xSi3O12∶xDy3+。XRD检测结果显示,合成的荧光粉主晶相为Ca3Y2Si3O12。荧光光谱分析结果表明:Ca3Y2-xSi3O12∶xDy3+硅酸盐荧光粉可以被348 nm的近紫外光激发,产生白光发射,两个主发射峰位于481 nm(4F9/2→6H15/2)和572 nm(4F9/2→6H13/2)。用481 nm最强峰监测,得到主激发峰位于348 nm的激发光谱,该光谱覆盖了300~450 nm的波长范围。研究了Dy3+离子掺杂浓度及助熔剂H3BO3对荧光粉发光特性的影响,Dy3+离子的最佳掺杂量x(Dy3+)为5%,助熔剂的最佳质量分数为2%。色坐标分析显示:荧光粉的色坐标随着掺杂离子浓度及助熔剂加入量改变而发生变化。x(Dy3+)为5%且H3BO3的质量分数为2%的样品的色坐标为(0.29,0.33),位于标准白光点的色坐标范围内。

A single host white phosphor Ca3Y2- xSi3O12∶ xDy3 +excited by near UV light was synthesized by the high temperature solid-state method at 1 400 ℃. XRD analysis showed that the principal crystalline phase was Ca3Y2Si3O12. The results of fluorescence spectroscopy indicated that Ca3Y2- xSi3O12∶ xDy3 +silicate phosphors could be effectively excited by near UV light of 348 nm,emitting white lig hts with two main emission peaks located at 481 nm(4F9 /2→6H15 /2) and 572 nm(4F9 /2→6H13 /2) respectively. When monitored at 481 nm,the excitation spectrum ranged from 300 to 450 nm and the main peak was located at 348 nm. The effects of the doping concentration of Dy3 +ion and the flux of H3BO3 to the emission intensity of the phosphors were studied. It is found that the optimum dopicontent of x( Dy3 +) is 5% and the optimum mass fraction of the flux is 2%. The chromaticity coordinate of the phosphors change with the doping concentration and the amount of flux. When x( Dy3 +) is5% and the mass fraction of H3BO3 is 2%,the chromaticity coordinate of the phosphor is( 0. 290,0.330) which locates within the scope of the chromaticity coordinate of the standard white point.