高温高压合成的SrSiO3:Eu3+Bi3+的结构及其对发光特性的影响

 本文首次报道在3.15 GPa、1 200 ℃高温高压条件下合成出了SrSiO₃:Eu³⁺Bi³⁺发光材料，并与常压合成产物相比较，研究了高温高压合成产物的结构以及合成压力、温度对发光特性的影响。结果表明，高压合成产物SrSiO₃:Eu³⁺Bi³⁺的结构为膺正交（单斜）结构，而常压合成的为六角结构，高压使发光强度下降，量子发光效率下降了88%，谱线红移达756 cm^-1，半值宽度也显著增加，发光性能的改变是由于压致结构的变化引起的。

THE STRUCTURE AND LUMINESCENCE CHARACTERS OF SrSiO_3:Eu~(3+) Bi~(3+) SYNTHESIZED BY HIGH PRESSURE AND HIGH TEMPERATURE

The SrSiO₃:Eu³⁺Bi³⁺ samples were firstly synthesized by high-pressure (HP) and high-temperature (HT) method under 3.15 GPa and 1 200 ℃. Comparing with those prepared under atmosphere pressure, the structure of the samples and the influence of pressure and temperature on the luminescence properties has been studied. It shows that the structure of the samples synthesized by HP and HT is of monoclinic, while the samples prepared under atmosphere pressure is of hexagonal. At the same time, for the samples synthesized by HP and HT the intensity and quantum luminescence efficiency decreased obviously, the half-width was broadened and the red shift of emission peak was enlarged to 756 cm^-1. The variation of the luminescence characters is due to the pressure-induced changes of crystal field interactions.