| abstract |
PROBLEM TO BE SOLVED: To provide a wide range of characteristics as a fluorescent whitening agent and a fluorescent dye, having absorption in the ultraviolet region, exhibiting strong color light in the visible region when excited by ultraviolet light, and displaying fluorescence. The present invention provides an extremely useful compound that can be used as a luminescent dye layer of a coating material for an electroluminescent display device. SOLUTION: embedded image (In the formula, the benzimidazolyl group is located at the ortho position of the hydroxy group, and m and n each represent 0, 1 or 2, provided that m and n do not both represent 0.) Diol compounds. |