Co-existence of Bi with multiple valence states in zeolites - Controlling the optical properties by annealing atmosphere

被引：10

作者：

Bai, Zhenhua ^{[1
]}

Fujii, Minoru ^{[1
]}

Hasegawa, Takashi ^{[2
]}

Kitano, Shohei ^{[1
]}

Imakita, Kenji ^{[1
]}

Mizuhata, Minoru ^{[2
]}

Hayashi, Shinji ^{[1
]}

机构：

[1] Kobe Univ, Dept Elect & Elect Engn, Grad Sch Engn, Nada Ku, Kobe, Hyogo 6578501, Japan

[2] Kobe Univ, Dept Sci & Chem Engn, Grad Sch Engn, Nada Ku, Kobe, Hyogo 6578501, Japan

来源：

OPTICAL MATERIALS | 2012年 / 34卷 / 05期

关键词：

Zeolite; Near-infrared emission; Bismuth; Optical properties; Annealing atmosphere; NEAR-INFRARED EMISSION; LUMINESCENCE PROPERTIES; BISMUTH; GREEN;

D O I：

10.1016/j.optmat.2011.11.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the effect of annealing atmosphere on the optical properties of Bi doped zeolites by diffuse reflectance, steady state and time-resolved photoluminescence (PL), and PL excitation measurements. The results reveal that zeolites can be used as an excellent host material to stabilize multiple Bi centers (Bi3+, Bi2+, and Bi-related near-infrared (NIR) active centers) in the framework, which shows ultra-broadband emission from visible to NIR range. Annealing in N-2 leads to the partial conversion of Bi3+ ions into Bi2+ and Bi-related NIR active centers. Our results demonstrate that the broadband NIR emission may be attributed to the electronic transition of Bi low valence state, rather than a higher valence state. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：821 / 825

页数：5

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