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以工业铝酸钠溶液制备的氢氧化铝为铝基原料,采用高温固相反应法合成了SrAl2O4∶Eu2+,Dy3+磷光粉,考察了稀土掺杂量、烧结温度及硼酸加入量对其发光性能、激发光谱及发射光谱的影响,并通过XRD谱及余辉衰减曲线对最佳工艺条件下制备的样品进行表征。结果表明,当稀土掺杂量x(Eu)=3%、x(Dy)=3%,烧结温度为1 300℃,烧结时间为4h,硼酸加入量w(H3BO3)=9%时,所制备磷光粉样品仍保持SrAl2O4的晶体结构,其发光性能最好,发光强度最大,主激发波长在360nm左右,主发射波长在510nm左右;余辉为黄绿色,衰减时间长。
Aluminum hydroxide prepared from industrial sodium aluminate solution was used as the raw material of aluminum. SrAl2O4:Eu2 + and Dy3 + phosphors were synthesized by high temperature solid-state reaction. The effects of rare earth doping amount, sintering temperature and boric acid dosage on the luminescent properties, Excitation and emission spectra. The XRD spectra and afterglow decay curve were used to characterize the samples prepared under the optimal conditions. The results show that when the amount of rare earth doped x (Eu) = 3%, x (Dy) = 3%, the sintering temperature is 1300 ℃, the sintering time is 4h and the amount of boric acid added w H3BO3 = 9% Phosphor samples still maintain the crystal structure of SrAl2O4, which has the best luminescence properties and the largest luminescence intensity. The main excitation wavelength is about 360nm and the main emission wavelength is about 510nm. The afterglow is yellow-green and the decay time is long.