Wiktionary
rubrene
n. (context chemistry English) A polycyclic aromatic hydrocarbon, (5,6,11,12-tetraphenyltetracene), used in chemiluminescence applications.
Wikipedia
Rubrene
Rubrene (5,6,11,12-tetraphenyltetracene) is a red colored polycyclic aromatic hydrocarbon. Rubrene is used as a sensitiser in chemoluminescence and as a yellow light source in lightsticks.