研究了铋离子掺杂磷铝酸盐玻璃近红外发光与光学碱度的反常现象.研究发现,通过改变碱金属离子半径调节玻璃基质光学碱度,在808 nm激光激发下铋离子位于1300 nm波段的近红外宽带发光强度随光学碱度的增大而增强,而在690 nm激光激发下得到的1100 nm波段近红外发光强度则随着光学碱度的增大而减弱.该玻璃1300 nm波段近红外发光强度与光学碱度依存关系与以往报道结果相反,且也与1100 nm波段发光特性相反.根据上述结果可以推测玻璃中1100和1300 nm波段的近红外发光源于不同价态的铋离子,而该玻璃体系的基质结构自还原作用是导致上述现象产生的主要原因.
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