ACTA

The Luminescence of CdWO₄:Tb,Li Crystals under Synchrotron Excitation at 10 K

S.S. Novosad^a, L.V. Kostyk^a, I.S. Novosad^a, A.P. Luchechko^a, and G.B. Stryganyuk^b
^aIvan Franko National University of Lviv, Universytetska 1, 79000 Lviv, Ukraine
^bInstitute for Scintillation Materials, National Academy of Sciences of Ukraine, Lenin Ave. 60, 61000 Kharkov, Ukraine

Received: February 17, 2012

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The luminescent properties of CdWO₄:Tb,Li crystals have been investigated at 10 K in the region 4-25 eV using synchrotron excitation. It is shown that besides the intrinsic matrix luminescence the number emission lines due to electron f-f-transitions in Tb³⁺ ions are efficiently excited at near-edge region of the fundamental absorption (E_exc = 4.1 eV). The weak recombination luminescence of terbium impurity on the background of intensive matrix luminescence is observed under excitation in the region of fundamental absorption (E_exc = 5.4 and 13.8 eV). It is shown that the luminescence spectrum of the matrix is a superposition of three elementary bands 2.07, 2.47, and 2.73 eV. The nature of emission bands is discussed.

DOI: 10.12693/APhysPolA.122.717
PACS numbers: 78.55.-m