CaZn_2(PO_4)_2∶Eu^(3+)的制备及其发光性能

Synthesis and Luminescent Properties of CaZn_2(PO_4)_2∶Eu^(3+) Phosphor

采用高温固相法合成了CaZn2(PO4)2∶Eu3+橙红色荧光粉,研究了其发光特性。该荧光粉在350～410nm处有一个宽带激发,其激发主峰位于394 nm。在紫外激发下,发射峰分别由Eu3+的5 D0→7 F1(585,595nm)、5 D0→7 F2(615、622 nm)、5 D0→7 F3(645 nm)及5 D0→7 F4(687,700 nm)4组线状峰构成,其中以595 nm发射峰最强。探讨了Eu3+的掺杂浓度对样品发光强度的影响以及Eu3+发射的橙/红光比值随浓度的变化关系,确定Eu3+的最佳掺杂摩尔分数为10%。实验结果表明,加入不同电荷补偿剂Li+,Na+,K+均能使发光强度得到提高,其中以Li+最佳。

The salmon pink phosphor CaZn2（PO4）2∶Eu3＋ was synthesized by high temperature solid state reaction,and its luminescent characteristics were also investigated.The excitation spectra contains a broad band extending from 350 to 420 nm,which is suitable for UVLED chip,and its main peak located at 394 nm.It showed that the emission spectra of the phosphor was composed of four group major emission peaks locating at 585 and 595 nm,615 and 622 nm,654 nm,687 and 700 nm which corresponding to the 5D0→7F1,5D0→7F2,5D0→7F3,5D0→7F4 typical transition of Eu3＋,respectively.The effects of doped-Eu3＋ concentration to the emission intensity and the ratio of IO/IR were also investigated.It showed that the optimum doped-Eu3＋ mole fraction is 10%.The charge compensation of Li＋,Na＋ and K＋ ions to the emission intensity was also studied,and it found that Li＋ ions gave the best improvement to enhance the intensity of the emission.