红色蓄光材料Y_2O_2S∶Eu^(3+)的硫熔法制备及其发光性能

Photoluminescence of Y_2O_2S∶Eu^(3+) phosphor prepared by flux fusion method

用硫熔法制备了系列红色蓄光材料Y2O2S∶Eu3x+(0.01≤x≤0.10)的多晶粉末样品并系统研究了其发光特性。XRD结果表明,晶胞参数c随着Eu3+含量的逐渐增大而增大,而晶胞参数a没有明显的线性变化关系,这与Y2O2S∶Eu3+的晶体结构有关。Y2O2S∶Eux3+(0.01≤x≤0.10)的激发光谱相似,在626nm发射光监控下最大激发波长约在330nm附近。在330nm激发下,随着Eu3+含量逐渐增大,发射光谱最强发射峰位置从540nm右移至626nm,观察到红色特征发射峰626nm的强度逐渐增大,在Eu3+含量为0.09时,其强度达到最大。在最佳合成条件及最佳Eu3+含量下,正在进行掺杂Mg2+和Ti4+及其发光特性的研究。

Single phase ot Y2O2S ： Eux^3＋ （0.01≤x≤0. 10） was prepared by the flux fusion method and their photoluminescence were investigated. The result indicated that the unit cell parameter c was linear increased with the increasing of Eu2O3 content in Y2O2S ： Eu（0.01≤x≤0.10）. On the other hand, the changing of unit cell parameter a isn＇t a linear dependence. Under 330nm excitation, the emission spectrum of Y2O2S ： Eux^3＋ （0. 014≤ x≤0. 10） were similarly and the strongest intensity emission peak was observed at about 540nm or 626nm. With the increasing of Eu2O3 content, the position of strongest intensity emission peak moved form 540nm （^5D1 →^7F2 transition） to 626nm （^5D0→^7F2 transition）, and the maximum intensity emission was obtained when x= 0.09 in Y2O2S ： Eux^3＋ （0.01≤x≤0.10）. This result is explained in terms of the environment of trivalent europium in the crystal structure of Y2O2S. Long afterglow properties of Y2O2S ： Eu^3＋ doped with Mg^2＋ ,Ti^4＋ were under currently investigated.