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In the present work, the isothermal decay of additively colored micro crystalline powders of various sizes and whiskers of potassium halides was studied. The decay of colors centers in powders and in whiskers of approximately same diameter was compared to get more information about interactions with dislocations. Also it will be interesting to see the effect of reversing the coloration crushing sequence in the manifestation of the interaction between color centers and dislocations.So the decay in additively colored powders was compared with decay in the powders of same size obtained by...

Recent developments in field of luminescent materials show the lot of interest in this area.The silicates are the largest, the most interesting and the most complicated class of minerals than any other minerals. Silicate materials are useful in may applications of technological importance. In the present work photo luminescence investigation of rare earth activated silicate based phosphor were studied.