Patent ID: 6455176
Filing Date: 2002-09-24
Classification: C09K,F21V,Y10S

Abstract:
A flurescence-reddening membrane which comprises a light-transmittable medium and, dispersed therein, (a) a rhodamine base fluorescence pigment and (b) a fluorescence pigment which has absorptions in the blue region and induces energy transfer to and reabsorptions from the rhodamine base fluorescence pigment wherein the (b) fluorescence pigment had absorptions in the blue region at a wavelength of 520 nm or less and has an optical density OD of 1.0 or more at a wavelength in the range of 420 to 490 nm, wherein a rhodamine base fluorescence pigment and a naphthalimide base fluorescence pigment are dispersed in a light-transmittable medium.