Red persistent luminescence in MgGa2O4 : Cr3+; a new phosphor for in vivo imaging

被引：111

作者：

Basavaraju, N. ^{[1
]}

Sharma, S. ^{[2
]}

Bessiere, A. ^{[2
]}

Viana, B. ^{[2
]}

Gourier, D. ^{[2
]}

Priolkar, K. R. ^{[1
]}

机构：

[1] Goa Univ, Dept Phys, Taleigao Plateau 403206, Goa, India

[2] Chim Paristech, Lab Chim Matiere Condensee Paris, F-75231 Paris 05, France

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2013年 / 46卷 / 37期

关键词：

D O I：

10.1088/0022-3727/46/37/375401

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new red-emitting long-lasting phosphorescence (LLP) material useful as biomarker for small animal in vivo imaging is presented. X-ray irradiated MgGa2O4 : Cr3+ is shown to be a suitable persistent phosphor emitting in the range 650-770 nm. In vivo re-excitation of its persistent luminescence is also possible with 580 nm excitation. MgGa2O4 : Cr3+ has almost 44% cationic site inversion. Cr3+ ion occupies octahedral site resulting in a broad emission peaking at 707 nm corresponding to Cr3+ 2E((2)G) -> (4)A(2)(F-4) transition. LLP is most intense for the compound with nominal Mg deficiency which also has the highest cation inversion. It is proposed that structural defects occurring due to cation inversion are responsible for LLP.

引用

页数：5

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