Patent ID: 7704599
Filing Date: 2010-04-27
Classification: C09D,C09K,Y10T

Abstract:
1. A composition comprising a carrier matrix, and a particulate luminescent composition dispersed therein, the particulate luminescent composition comprising a rare-earth-doped alkaline earth fluoride represented by the formula wherein RE represents a three-valent rare-earth element, A is alkaline earth, 0.002≦x≦0.20, and 0≦y≦x; the particulate luminescent composition exhibiting a luminescence spectrum having a plurality of intensity peaks at characteristic wavelengths, wherein at least one pair of the intensity peaks at different wavelengths in the luminescence spectrum of the particulate luminescent compound exhibits a peak intensity ratio that is at least 5% greater than the corresponding peak intensity ratio of a corresponding first reference composition, and that is also at least 5% less than the corresponding peak intensity ratio of a corresponding second reference composition wherein the first corresponding reference composition has not been exposed to a temperature above 100° C. and the second corresponding reference composition has been subject to heating to 900° C. for 6 hours.