摘要:
Single-substrate KSr4 (BO3) 3:n%Dy3+, 0.5% Tm3+ (n=0.5, 1.0, 1.5) white phosphors were prepared by high temperature solid-state method. The emission spectra of 356 nm were tested. This emission spectra contained the characteristic emission peak of Dy3+ (491, 574 nm), and also contained the characteristic emission peak of Tm3+ (454 nm). With the increase of doping concentration of Dy3+, the emission intensity of Tm3+gradually weakened, while the intensity of Dy3+ gradually enhanced. The color temperatures of KSr4 (BO3) 3:n%Dy3+, 0.5%Tm3+ (n=0.5%, 1%, 1.5%) were calculated as follows: 12 797, 7 180, 5 734 K. The compensated charge of Li+, Na+, K+ with a doping concentration of 1.5% was incorporated into KSr4 (BO3) 3: 1.0% Dy3+, 0.5% Tm3+, and the emission intensity was significantly enhanced. When the compensation charge was Na+, KSr4 (BO3) 3:1.0%Dy3+, 0.5%Tm3+ had the highest luminous intensity at 574 nm. Through XRD characterization, it was found that there was no obvious change in the matrix structure after incorporation of Na+ and K+, and the incorporation of Li+ resulted in the appearance of a small miscellaneous peak.%通过高温固相法制备出单基质KSr4(BO3)3:n%Dy3+, 0.5%Tm3+(n=0.5, 1.0, 1.5)白光荧光粉, 对356 nm激发的发射光谱进行了测试, 发射光谱包含有Dy3+的特征发射峰(491, 574 nm), 也包含有Tm3+的特征发射峰(454nm).随着Dy3+掺杂浓度的增加, Tm3+的发光强度逐渐减弱, 而Dy3+的发光强度逐渐增强.计算得到KSr4(BO3)3:n%Dy3+, 0.5%Tm3+(n=0.5%, 1%, 1.5%)的色温依次为:12 797, 7 180, 5 734 K.将掺杂浓度为1.5%的补偿电荷Li+、Na+和K+掺入了KSr4(BO3)3:1.0%Dy3+, 0.5%Tm3+中, 发光强度都有明显的增强, 补偿电荷为Na+时KSr4(BO3)3:1.0%Dy3+, 0.5%Tm3+在574nm处的发光强度最高.通过XRD表征发现掺入Na+、K+后基质结构没有明显的改变, Li+的掺入导致了一个小杂峰的出现.