کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1495427 | 992935 | 2012 | 4 صفحه PDF | دانلود رایگان |

We report on the near-infrared (NIR) luminescent properties of Bi2O3–GeO2 glass. Apparent differences of NIR luminescence, decay properties and thermal stability manifest the co-existence of more than one active center in this system. The effects of Al ions introduced both unintentionally and intentionally were investigated. 27Al NMR analysis proposes 4-fold Al coordination as dominant structure which can also provide the environment for active centers. We suggest that Al ions play a crucial role to restrain concentration quenching at higher Bi2O3 concentration instead of assisting to construct Bi centers.
► Different behaviors of multiple NIR emission centers were investigated.
► The effects of Al ions depend on the composition of Bi2O3–GeO2 glass.
► Al ions help to restrain concentration quenching at higher Bi2O3 concentration.
Journal: Optical Materials - Volume 34, Issue 4, February 2012, Pages 675–678