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%.

In this thesis , we studied the photo-chemistry between the green emitter (C545T) and the photo-acid generator (PAG) . When the sample of C545T and PAG in solutions and thin films were exposured to UV-light , we found that a new product was produced due to protonation of C545T with the acid generated by PAG . Therefore , we measured absorption and fluorescence spectra of the samples in solutions (THF) and in polymer (PMMA) thin films . The different concentrations of C545T dopanted photo-acid generator in the solvent (THF) could increase the photo-acid generator at higher concentrations of PAG , the energy could be transferred from unprotonated to protonated . Therefore , we can easily observe the absorption and fluorescence spectra have been changed and the phenomenon of stock¡¦s shift has been found accordingly . At higher concentrations of C545T in solutions , also called concentrations quenching effect was observed because C545T molecules could collide each other easily that causes intensity to decrease in the solvent (THF) . In order to get rid of the collision effect , we use the samples of polymer thin films instead of solutions . The different of the change of spectra between solutions and thin films were observed and compared were also studied .