2-Chloro-9,10-diphenylanthracene
2-Chloro-9,10-diphenylanthracene is a fluorescent dye used in glow sticks for a blue-green glow. It is a chlorinated derivative of 9,10-diphenylanthracene. See also
 2-Chloro-9,10-bis(phenylethynyl)anthracene

References 

Fluorescent dyes
Anthracenes
Chloroarenes