Crystal Structure and luminescence of SrAl_2O_4: Eu~(2+), Dy~(3+) Phosphor Prepared by Nano-pseudoboehmite Particulate Peptizing Method

摘要

Eu~(2+), Dy~(3+) co-doped strontium aluminate (SrAl_2O_4) phosphor with high brightness and long afterglow were prepared by nano pseudo-boehmite particulate sol method. The precursor was prepared by peptizing AlOOH powders with HNO_3 as peptize agent. The influence of preparation parameters on crystal structure and luminescent properties of the phosphor have been studied systematically. Monoclinic SrAl_2O_4 host with single-phase can be obtained by controlling sintering temperature at 1200°C, 4Wt%B_2O_3 and R_(Sr/Al)=0.34. The sample exhibits an intensive emission peak at 515 nm and the luminescent intensity decay with I=277.78t~(-1.079).