Luminescence Spectra of ZnAl 2 O 4 {:}Cr 3+ Spinel Nanopowders

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 .

DOI: 10.12693/APhysPolA.104.581 PACS numbers: 78.60.--b, 72.80.Ga, 81.05.Je, 81.05.Mh