论文部分内容阅读
采用沉淀-燃烧法结合超声波技术合成了小颗粒Sr3(PO4)2∶Tb3+荧光粉,测量了其光谱特性。在Sr3(PO4)2∶Tb3+体系中观察到Tb3+的特征发射,峰值波长分别为489,542,584,620nm,分别对应于Tb3+的5 D4→7F6、5 D4→7F5、5 D4→7F4和5 D4→7F3跃迁,其中542nm处的绿色发射最强。激发光谱由4f75d1宽带吸收(200～280nm)和4f→4f电子跃迁吸收(280～390nm和475～500nm)组成,可被近紫外发光二极管(NUV-LED)有效激发。采用R+(R=Li,Na,K)作为电荷补偿剂,结果表明:Li+作为电荷补偿剂使样品发光强度提高了31%,Na+和K+的掺入则降低了粉体在近紫外区的吸收。
A small particle Sr3 (PO4) 2: Tb3 + phosphor was synthesized by precipitation-combustion method combined with ultrasonic technique. The spectral characteristics of the sample were measured. The characteristic emission of Tb3 + was observed in Sr3 (PO4) 2Tb3 + system with peak wavelengths of 489,542,584 and 620 nm, respectively corresponding to 5 D4 → 7F6, 5 D4 → 7F5, 5 D4 → 7F4 and 5 D4 → 7F3 transitions of Tb3 + Among them, the green emission at 542 nm is the strongest. The excitation spectrum is composed of 4f75d1 broad band absorption (200 ~ 280nm) and 4f → 4f electron transition absorption (280 ~ 390nm and 475 ~ 500nm), which can be effectively excited by near ultraviolet light emitting diode (NUV-LED). Using R + (R = Li, Na, K) as the charge compensator, the results show that the luminescence intensity of the sample is increased by 31% with Li + as the charge compensator, and the absorption of the powder in the near ultraviolet region is reduced by the incorporation of Na + and K + .