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结构自还原效应对铋掺碱土金属硅磷铝硼玻璃超宽带近红外发光的影响*
Effects of sefl-reduction of glass matrix on the broadband near infrared emissions from Bi-doped alkali earth aluminoborosilicate glasses*
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摘要: 本文报道了结构自还原对铋掺杂碱土金属硅磷铝硼玻璃超宽带近红外发光性质的影响.以Eu作为对比,在空气气氛中采用高温熔融法分别制备了Eu2O3和Bi2O3掺杂的35SiO2-25AlPO4-12.5Al2O3-12.5B2O3-15RO (R=Ca,Sr,Ba)玻璃.结果证实该玻璃中可发生Eu3+→Eu2+的高温自还原现象,且随着碱土金属离子半径增大Eu2+的自还原性减弱;同样条件下Bi位于1300 nm波段的近红外发光却随之增强,而位于1100 nm波段近红外发光和源于Bi2+的红光则减弱.根据结构自还原机理及碱土离子半径变化对玻璃近红外超宽带发光性质的影响,讨论了Bi离子的近红外发光中心的归属.上述研究表明玻璃结构自还原特性可以为Bi近红外发光机理研究以及高效Bi掺杂超宽带近红外发光玻璃的设计提供一种有效的思路和方法.Abstract: We report the effects of self-reduction of glass matrix on the broadband near infrared (NIR) emissions from Bi-doped alkali earth aluminoborosilicate glasses. Bi2O3-doped as well as Eu2O3,-doped as a comparison, 35SiO2-25AlPO4-12.5Al2O3-12.5B2O3-15RO (R=Ca,Sr,Ba) glasses were prepared in air. Results show that the self-reduction process of Eu3+→Eu2+occurs in this glass matrix. Meanwhile the intensity of NIR emission peaked at about 1300 nm increases with the increase in the radius of alkali earth ions, while the intensity of both NIR emission peaked at about 1100 nm and the red emission from Bi2+decreases. Then the origins of infrared-emitting bismuth centers were discussed according to the correlation of the conversion of Bi ions with the size of alkali earth ions. The results of this work is helpful for understanding the nature of Bi-NIR-emission and may be a guide for the selection of composition of high performance Bi-doped glass.
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