【摘要】 本文报道了稀土硅磷酸盐基质的最佳组成、性质和以Ce³⁺为激活剂的荧光体的发光性能及温度对发光的影响。更多还原

【Abstract】 Rare earth silicophosphates with a general formula RE2O3·0.10SiO2· 0.95P2O5 were synthesized and developed as good host materials. This paper reports a systematic investigation on the luminescence properties of Ce3+-activated silicophosphates of lanthanum and gadolinium. Samples of definite composition and single phase were prepared by solid state reactions. Their crystal stuctures were determined by high resolution X-ray diffractometer D/maxra (4okV, 150mA) to be monodinic and isostructural with GdPO4(ASTM 26-660) (Fig. 2). The latice parameters were calculated(Table 1).The emission, excitation and diffuse reflectance spectra of these two phosphors are determined(Fig. 4, Fig.5).The temperature effect from 77 to 42 3K on the luminescence of these phosphors has been studied. These appears the thermal shifts of sublevels of 2F7/2 of Ce3+(Fig,6, Fig.7)From the concentration dependence of Ce3+ emission Igx-1gI/x a conclusion may be drown, that the concentration quenching of Ce3+ in the LSP and GSP comes from the dipole-dipole interaction(Fig.10, Fig.11).更多还原