| 摘要 |
An optical filter is provided to reduce a half-width and to use the optical filter as an optical element to the light having of a wavelength of 380-500 nm. An optical filter comprises at least one kind of compound represented by the formula I, wherein R1, R2, R3, R4 and R5 are independently H, a C1-C8 alkyl group, an amino group, or a hydroxyl group; R1 and R2, R2 and R3, R3 and R4, and R4 and R5 can be connected to form a ring; R6 is a cyano group, -COOR, -OCOR, -CONHR, -NHCOR, -COONHR, -NHCOOR, -COR, -SO2R, -SOR, -SONRR', a halogen atom, a nitro group, or a phosphono group; R and R' are independently H, a C1-C8 alkyl group, a C6-C20 aryl group, or a C7-C20 arylalkyl group; and the methylene group of the C1-C8 alkyl group can be substituted with -O-, -S-, -COO-, -OCO-, or -CH=CH-.
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