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    STUDIA PHYSICA - Issue no. SPECIAL%20ISSUE / 2001  
         
  Article:   CHARACTERISATION OF OXIDIC MATERIALS WITH LUMINESCENT PROPERTIES.

Authors:  LAURA UNGUR, ELISABETH-JEANNE POPOVICI, MARIA VĂDAN, LIGIA PASCU, MARILENA VASILESCU, M. NAZAROV. 		 
       
         
  Abstract:  Under UV or cathode ray excitation, europium activated yttrium oxide phosphor shows bright characteristic red luminescence. Y2O3: Eu phosphor is especially used in the manufacture of coloured fluorescent lamps and plasma display panels. Phosphor utilisation depends both on powder characteristics and luminescent properties and sensitivity to various excitation radiation. The paper reveals the correlation between photoluminescence (PL) and cathodoluminescence (CL) properties and the synthesis conditions. Polycrystalline phosphor samples were prepared by thermal synthesis at 1100-1400C, from homogeneous mixtures containing yttrium oxide (host lattice), Eu2O3 (activator source) and alkaline earth salts (flux). PL spectra and CL defectoscopy measurements put in evidence the influence of thermal synthesis conditions on europium incorporation degree into the yttrium oxide host lattice.  
         
     
         
         
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