| abstract |
This disclosure relates to luminescent compositions comprising a host matrix sensitized by Ce 3+ and showing emission in the ultraviolet range. Typical host matrices include fluorides, sulphates, and phosphates, in particular A(Y 1-x-y Lu x La y )F 4 , A(Y 1 -x-y Lu x La y ) 3 F 10, BaCa(Y 1-x-y Lu x La y ) 2 F 10 , and Ba(Y 1-x-y Lu x La y ) 2 F 8 , wherein A = Li, Na, K, Rb, or Cs. One or more of these luminescent compositions may be applied as a ceramic or single crystalline converter for CT, PET or SPECT scanners, or as a luminescent powder layer for x-ray intensifying screens. |