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Luminescence Spectra of ZnAl 2 O 4 {:}Cr 3+ Spinel Nanopowders |
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H.H. Luc
a
, T.K. Nguyen
a
, V.M. Nguyen
a
, A. Suchocki
b
, A. Kamińska
b
, V.K. Le
b
, V.H. Nguyen
a
and T.T. Luong
a
a Faculty of Physics, Hanoi University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam b Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland |
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| Received: September 30, 2003 |
| The synthetic ZnAl 2 O 4 spinels doped with Cr 3+ ions are prepared from ZnSO,dwi{4}>, Al 2 (SO 4 ) 3 , and Cr 2 (SO 4 ) 3 . The spinel single phase is detected from X-ray diffraction. Luminescence properties of Cr 3+ in ZnAl 2 O 4 were studied by low temperature luminescence and decay measurements. Four luminescence lines at 14570, 14520, 14460, and 14330 cm -1 were found to originate from structure distortion and the line at 14175 cm -1 -- from chromium pairs. The broad emission band at about 13540 cm -1 is considered to arise from a new Cr 3+ center in ZnCr 2 O 4 . |
| PACS numbers: 78.60.--b, 72.80.Ga, 81.05.Je, 81.05.Mh |