铝酸盐类发光材料红外释光的研究

Emission Stimulated by Infrared Radiation for Some Aluminate Phosphors

报道了铝酸盐类发光材料体系存在高效率的红外释光现象 ,成功地合成出对红外光束反应灵敏的铝酸盐类发光材料 ,研制出红外激光检测板。同时研究了该类发光材料红外与紫外发光及其荧光衰减特性 ,提出了该类发光材料的红外发光应属于红外释光过程 ,并展示了其实际应用前景。

It is found that there is emission stimulated by infrared radiation for some aluminate phosphors doped by Eu 2+ ,such as SrAl 2O 4∶Eu(green),SrAl 14 O 25 ∶Eu(blue green) and CaAl 2O 4∶Eu(blue). Under the excitation of UV light,this kind of aluminate phosphors can give photoluminescence (PL).The PL spectrum of SrAl 14 O 25 ∶Eu peaked at about 265～280nm,under the excitation of 254nm.The stimulated emission spectrum is the same as PL spectrum for these Eu 2+ doped aluminate phosphors. Since the existence of deep electron traps in the phosphors, the excitation energy can be stored after the excitation of UV or sunlight,then the infrared radiation can induce the energy release by means of stimulated emission. The stimulated emission from the aluminate phosphor has a long decay time up to a few 10min.This phenomenon can be used to detect the infrared laser emission.