Grain-size effect on Cr3+and F-centres photoluminescence in nanophase MgAl2O4 ceramics

被引：10
|
作者：
Spiridigliozzi, Hugo [1 ]
Museur, Luc [2 ]
Trannoy, Virgile [1 ]
Gautron, Eric [3 ]
Kotlov, Aleksei [4 ]
Feldbach, Eduard [5 ]
Schoenstein, Frederic [1 ]
Kanaev, Andrei [1 ]
机构：
[1] Univ Sorbonne Paris Nord, CNRS, Lab Sci Proc & Mat, F-93430 Villetaneuse, France
[2] Univ Sorbonne Paris Nord, Lab Phys Lasers, CNRS, F-93430 Villetaneuse, France
[3] Nantes Univ, Inst Materiaux Nantes Jean Rouxel, CNRS, IMN, F-44000 Nantes, France
[4] Photon Sci DESY, Notkestr 85, D-22607 Hamburg, Germany
[5] Univ Tartu, Inst Phys, W Ostwald Str 1, EE-50411 Tartu, Estonia
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2023年 / 43卷 / 14期
关键词：
Nanophase ceramics; Photoluminescence; Grain size effect; F-centres; Cr3+ions; RADIATION TOLERANCE; SPINEL; LUMINESCENCE; DEFECTS; CR-3+; SPECTRA; STATES; IONS;
D O I：
10.1016/j.jeurceramsoc.2023.06.005
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Photoluminescence (PL) spectroscopy of transparent MgAl2O4 spinel ceramics with grain size between 100 and 300 nm was studied at 7 K temperature in the near-IR-VUV range of spectrum with synchrotron radiation excitation. The PL spectra were composed of optical transitions from spatially different regions of the ceramics, which analysis evidenced grain size effect on the emission line-shapes and intensities. In particular, emission of impurity Cr3+ ions, being structured in the crystalline bulk, became broad-band in the grain boundary regions, which was associated with respectively strong and weak local crystalline fields. It was observed that (i) excitons and F centres transfer energy to Cr3+ and (ii) Cr(2Eg)/Cr(4T2g) and F-centres/Cr3+ PL intensity ratios underwent a linear dependence on the grain size.
引用
收藏
页码：6349 / 6355
页数：7
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