Xh. Zhang et al., Photoluminescence and electroluminescence behaviors of pyrazoline compounds - A study on the blue colour emitter in EL device, ACT CHIM S, 58(3), 2000, pp. 293-296
The photoluminescence and electroluminescence behaviors of four types of py
razoline compounds of different structures dissolved in solution or compose
d as a dopping dye in the EL device have been studied in this work. Results
indicated that the non - cyclic hydrazone compound containing the same con
jugated moiety as in pyrazoline is unable to emit strong fluorescence eithe
r in solution or in solid film. But, for the pyrazoline compound very stron
g luminescence can be observed when it was measured in both conditions desc
ribed above. The pyrazoline compounds with phenyl group at 5 - position pos
sess excellent property of film formation due to the difficulty in crystall
ization. On the contrary, the pyrazoline compound without phenyl group at 5
- position is unadaptable to preparing EL device, because the layer contai
ned those compounds collapse rapidly due to crystallization.