光致发光
锶
光催化
发光
辐照
光化学
材料科学
化学
分析化学(期刊)
光电子学
物理
有机化学
催化作用
核物理学
作者
Dmitry S. Shtarev,Anna V. Shtareva,N. I. Selivanov,V. K. Ryabchuk,Aida V. Rudakova,Nick Serpone
出处
期刊:ChemPhotoChem
[Wiley]
日期:2020-07-10
卷期号:4 (10): 5209-5222
被引量:4
标识
DOI:10.1002/cptc.202000128
摘要
Abstract The low‐temperature photoluminescence (T<300 K) and UV‐induced formation of color centers of recently synthesized Sr 2 Bi 2 O 5 , Sr 3 Bi 2 O 6 and Sr 6 Bi 2 O 11 bismuthates are examined. The estimated Mott‐Seitz activation energies, ranging from 88 to 167 meV, correspond to various emission bands. Comparison of the response of all three bismuthates when exposed to UV‐illumination indicates that photoluminescence and formation of color centers are two processes that compete with photocatalytic activity. The most photoactive Sr 6 Bi 2 O 11 bismuthate exhibits neither luminescence nor the ability toward photocoloration. By contrast, Sr 2 Bi 2 O 5 , which exhibits no photocatalytic activity, displays an intense photoluminescence; UV irradiation causes significant changes of its color. The bismuthate Sr 3 Bi 2 O 6 occupies an intermediate position as it exhibits some photocatalytic activity, as well as the ability to photoluminesce and to undergo photocoloration. Simple models are described to systematize the experimental results, which place these bismuthates into a new class of photoactive materials.
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