A Novel Class of Emitting Amorphous Molecular Materials as Bipolar Radical Formants:  2-{4-[Bis(4-methylphenyl)amino]phenyl}- 5-(dimesitylboryl)thiophene and 2-{4-[Bis(9,9-dimethylfluorenyl)amino]phenyl}- 5-(dimesitylboryl)thiophene
Distribution of the number of citations over years.