Photoluminescence of monovalent indium centres in phosphate glass
Photoluminescence of monovalent indium centres in phosphate glass
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DOI：
10.1038/srep13646
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发表时间：
2015-09-01
影响因子：
4.6
通讯作者：
Ina T
中科院分区：
文献类型：
--
作者：
Masai H;Yamada Y;Okumura S;Yanagida T;Fujimoto Y;Kanemitsu Y;Ina T
多价阳离子的价态控制对于各种材料的功能化是重要的。氧化铟已用于各种应用中，例如透明导电膜中的氧化铟锡。然而，虽然亚稳态In+（5 s2配置）物种表现出光致发光（PL），他们吸引了很少的关注。In+阳离子在这些材料中的价态控制对于进一步的功能化将是重要的。在这里，我们描述了在+物种使用PL和X射线吸收精细结构（XAFS）分析。In ~+中心在紫外区有三个吸收带：两个弱禁带（1 S 0 → 3 P1，1 S 0 → 3 P2）和一个强允许带（1 S 0 → 1 P1）。最强的PL激发带不能归因于传统的允许跃迁到单重激发态。微秒量级的发射衰减表明辐射弛豫发生在三重激发态。XAFS分析表明，这些In+物种具有较短的In-O距离与较低的配位数比在In 2 O3。这些结果清楚地表明，In+存在于一个亚稳态的非晶网络，这是所观察到的发光性能的起源。
Valence control of polyvalent cations is important for functionalization of various kinds of materials. Indium oxides have been used in various applications, such as indium tin oxide in transparent electrical conduction films. However, although metastable In+ (5 s2 configuration) species exhibit photoluminescence (PL), they have attracted little attention. Valence control of In+ cations in these materials will be important for further functionalization. Here, we describe In+ species using PL and X-ray absorption fine structure (XAFS) analysis. Three absorption bands in the UV region are attributed to the In+ centre: two weak forbidden bands (1S0 → 3P1, 1S0 → 3P2) and a strong allowed band (1S0 → 1P1). The strongest PL excitation band cannot be attributed to the conventional allowed transition to the singlet excited state. Emission decay of the order of microseconds suggests that radiative relaxation occurs from the triplet excitation state. The XAFS analysis suggests that these In+ species have shorter In–O distances with lower coordination numbers than in In2O3. These results clearly demonstrate that In+ exists in a metastable amorphous network, which is the origin of the observed luminescent properties.