CaTiO_3∶Pr^(3+)长余辉玻璃的制备与发光性能

Preparation of CaTiO_3∶Pr^(3+) Red Long Afterglow Glass and Their Luminescent Properties

用二次熔融法制备了CaTiO3∶Pr3+红色长余辉玻璃。测量了样品的发射光谱,其发射光谱峰值为611.7,614.5 nm,对应于Pr3+的4 f-4 f(1D2→3H4)跃迁,与CaTiO3∶Pr3+晶态长余辉发光粉的发射光谱峰值相一致。玻璃粉与发光粉的质量配比在95∶5~80∶20时,都可以形成玻璃态并得到红色长余辉发光。研究了气氛和熔融温度对发光性能的影响,在空气环境下,800℃即可得到性能良好的样品。

The green and blue long-lasting luminescent glass has been successfully prepared, but the red long-lasting luminescent glass has not been reported at the present time. CaTiO3： Pr^3＋ red long-lasting luminescent glass was obtained by two steps method. At the first, CaTiO3： Pr^3＋ long lasting luminescence powder and low melting glass powder were synthesized by high-temperature solid-state reaction respectively. Secondly, the two components were weighed in appropriate mass ratio and mixed homogeneously. Finally, the mixtures obtained were sintered at different temperature for 10 min. The afterglow properties were researched systemically. The effects of the amount of CaTiO3： Pr^3＋ in mixtures and the procedure conditions were studied also. The emission spectra of samples were measured. The emission peaks at 611.7 nm and 614.5 nm, corresponding to the transition 4f-4f（ ^1D2→^3H4 ） of Pr^3＋ ions, come from the CaTiO3 ： Pr^3＋ red long afterglow emission. There was a broad band from 350 nm to 550 nm in the excitation spectrum, which showed that the glass could absorb the energy from near ultraviolet to yellow green, so the samples could be excited by sun light and lamplight then emitte the red long lasting afterglow. When the mass proportion of glass powder and phosphors is within 95：5 -80： 20, the pure glass phase could be gained and excellent red long afterglow could be observed. The effects of the atmosphere and the fuse temperature on the luminescent property were studied. The samples prepared at 800℃ in air have better luminescent characteristic.