LUMINESCENCE PROPERTIES OF LISR(2)Y(1-X)LN(X)O(4), (LN=EU, TB, TM) 0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1)

Investigations of the luminescence properties of LiSr2Y1-xEuxO4, LiSr2 Y1-xTbxO4 and LiSr2Y1-xTmxO4 (0 less than or equal to x less than or e qual to 1) at room temperature are reported. These samples were synthe sized by a solid state reaction. The excitation spectra of Tb1+ emissi on in LiSr2Y1-xTb1O4 (0 less than or equal to x less than or equal to 1) consist of broad bands corresponding to a transition between the 4f (8) and 4f(7)5d(1) states of Tb3+. The maximum intensity is situated a t about 318 nm. This is at a much longer wavelength than those of othe r Tb3+ doped phosphors. This is explained bq a large offset of the adi abatic potential curve of the 4f(7)5d(1) state. (C) 1998 Elsevier Scie nce S.A.