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掺Bi的MgO–CaO–Al2O3–SiO2玻璃的吸收和近红外发光特性

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Abstract:

研究了4种不同Bi2O3掺杂量(0.5%,1%,2%和3%,摩尔分数)的23MgO–11CaO–15Al2O3–51SiO2(摩尔比)玻璃的发光特性。测量了吸收光谱、荧光光谱和荧光寿命。通过电子顺磁共振图谱观察了玻璃受γ辐射前后结构的变化,探讨了玻璃颜色变化和近红外发光的机理。结果表明在500nm激发下,随着Bi2O3掺杂量从1%到3%的逐渐增加,发光波长发生红移,荧光半高宽从312nm增加到352nm;最优的Bi2O3掺杂量为1%,玻璃的受激发射截面和荧光寿命的乘积为3.10×10–24cm2·s;γ辐射后发光强度的增加和玻璃颜色加深的现象说明Bi掺杂玻璃的近红外发光中心可能是低价态的Bi离子或者Bi团簇。

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