Azo compounds of formula (I), wherein X stands for halogen, in particular for chlorine, or C₁-C₄alkoxy, in particular for methoxy, Y stands for —CH₂— or —O—, R₁ and R₂, independently from each other, stand for hydrogen, C₁-C₈alkyl, or C₆-C₁₄aryl, which may be substituted up to three times with C₁-C₈alkyl, C₁-C₄alkoxy or halogen, a process for their preparation and their use as fluorescent compounds, in particular as solid fluorescent compounds, such as for special effect printing, sectrity printing or in the opto-electronic field. ##STR1##