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Photoluminescence and persistent luminescence properties of non-doped and Ti4+-doped Mg2SnO4 phosphors 下载免费PDF全文
Mg2SnO4 exhibits green photoluminescence and persistent luminescence, which originate from oxygen vacancies. When Ti4+ ions were doped, an interesting Mg2SnO4:Ti4+ phosphor with bluish white photoluminescence under ultraviolet irradiation and with green persistent luminescence was first obtained. Our investigation reveals that two emission centres exist in Mg2SnO4:Ti4+. The centres responsible for the green emission are considered to be the F centres (oxygen vacancies) and the blue centres are the TiO6 complex. Trap clusters in the band gap with different depths, such as [SnMg‥—Oi″], [SnMg‥—VO·], [SnMg‥—VO×] and MgSn″, correspond to the components at 85 ℃, 146 ℃ and 213 ℃ of the thermoluminescence curve. 相似文献
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采用高温固相法合成了发光材料Ca2GeO4 ∶Eu3+ ,并详细研究了其紫外-真空紫外发光特性. 发现并解释了Eu3+ 离子在空气中的自还原以及在不同波长激发下的颜色转换现象. Ca2GeO4 ∶Eu3+ 在163—230和301,466 nm处具有强激发带,表明Ca2GeO4 ∶Eu3+
关键词:
2GeO4 ∶Eu3+')" href="#">Ca2GeO4 ∶Eu3+
光致发光机理
空气中自还原
颜色转换 相似文献
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