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用高温固相还原法合成了无稀土激活离子Y2O2S∶0.09Ti长余辉发光材料,研究了 Li2CO3,Na2CO3,K2CO3,K3PO4和K2HPO4等 5种助熔剂对Y2O2S∶Ti磷光体发光性能的影响。结果表明:除了 K2HPO4外,加入 Li2CO3,Na2CO3, K2CO3与 K3PO4助熔剂均可得到单相Y2O2S∶Ti晶体。发射光谱结果显示:不同助熔剂的加入并没有改变样品发射谱主峰位置(565 nm),但对其峰强度产生明显影响。助熔剂也显著改善了Y2O2S∶Ti的余辉亮度,特别是Li2CO3。10 min衰减时,Y2O2S∶Ti样品的余辉亮度从加 K2CO3助熔剂的0.15 mcd/m2增加到加Li2CO3助熔剂的10.1 mcd/m2。用紫外光激发样品,移去光源后,加Li2CO3助熔剂合成的样品在暗室中的余辉时间可持续达 5 h(0.32 mcd/m2) 。
The rare earth - activated Y2O2S: 0.09Ti long afterglow phosphor was synthesized by high temperature solid - state reduction method. The effects of Li2CO3, Na2CO3, K2CO3, K3PO4 and K2HPO4 flux on the luminescent properties of Y2O2S: Ti phosphor were studied. The results show that single phase Y2O2S:Ti crystals can be obtained by adding Li2CO3, Na2CO3, K2CO3 and K3PO4 flux besides K2HPO4. The results of emission spectroscopy showed that the addition of different fluxes did not change the main emission peak position (565 nm), but had a significant effect on the peak intensity. The flux also significantly improved the afterglow brightness of Y2O2S: Ti, especially when the decay of Li2CO was 3.10 min, the afterglow brightness of Y2O2S: Ti increased from 0.15 mcd / m2 with K2CO3 flux to 10.1 mcd / m2 with Li2CO3 flux . After the sample was excited by ultraviolet light and the light source was removed, the afterglow time of the sample synthesized with Li2CO3 flux in the darkroom could reach 5 h (0.32 mcd / m2).