Recently

phosphorescent materials like iridium(III) complexes have been attracted a lot of interest for their potential application on fabricating organic light emitting diodes (OLEDs) and their high phosphorescence quantum efficiency which is due to mixing the singlet and the triplet excited states via spin-orbit coupling and enhancing the triplet-state subsequently. In our work

a series of new iridium complexes were synthesized based on the ligands of benzotriazole derivatives. Complexes Ir(TBT)

Ir(EBT)

Ir(CBT) were characterized by 1H NMR and ESI. In addition

steady photoluminescence studies reveal that Ir(TBT)

Ir(CBT) and Ir(EBT) exhibit orange-red

orange and yellow fluorescent emissions in solid state at room temperature

respectively. According to the study

it is found that the emission maximum of these complexes can be tuned by modified ligands. Theoretical studies of electronic structures were carried out using density functional theory at the B3LYP/6-31G

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level in order to gain a good understanding of the luminescent behaviors of these materials. The quantum chemistry calculation results are accordant with the experiment study. In addition

the thermal stability was also investigated by DSC and Tg is located about 133℃

which shows the material Ir(TBT) meets the thermal request for OLEDs materials. Based on the study

it shows that these complexes could be designed as OLEDs materials.Our work proves that the iridium complexes based on benzotriazole derivatives can be perfect candidates for fabricating OLEDs.