The purpose of the research is probing for the cause that red shift of green-host Alq3 is doped by red dopant with concentration increasing. Generally speaking, this phenomenon of red shift is resulted from the excimer that complex formed by the interaction of an excited molecular entity with a ground state partner of the same structure. And that excimer maybe formed by cyaniding group of red dopant because of the molecular polarity. We will survey the difference of spectra when Alq3 doped guest with different doping concentration in order that research the circumstance of energy transfer. We also success to synthesize the novel material of red dopant from green-dopant C545P,and name the red dopant ¡§RC545P¡¨. Then, we will measure the performance of the RC545P to compare with DCJTB that is often used to be the red dopant in OLED. Finally, we prove the assumption that excimer formed by cyaniding group is result in the red shift of spectra. Moreover, the emission efficiency of RC545T (9.28) in solution is better than DCJTB (7.96), but the efficiency of Alq3 energy transfer to RC545T (17.88%) is worse than DCJTB (36.72%). In thin film, the emission efficiency of Alq3 doped RC545T (42.3) is closer than Alq3 doped DCJTB (48.9). the optimal concentration ratio of Alq3 doped RC545T is between 1% and 2%.

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