| 초록 |
In this study, we were designed, synthesized and characterized four thermally stable hole transporting materials with carbazole and triphenylamine moieties. The designed materials were synthesized by using single step Suzuki coupling reaction with better yield percentage. The HOMO energy levels of all HTMs were noticed between -5.62 to -5.48 eV, which can facilitate an effective hole transporting pathway. Triphenylamine based HTM 2A and 2B showed better properties when compare with carbazole core based HTM 1A and 1B. HTM 2A was showed higher current efficiency of 30.6 cd/A, which is higher than that of NPB (27.9 cd/A) based similar device. The external quantum efficiency (EQE) of HTM 2A was at 26.7%, which is extremely higher than other materials used in our current study. Moreover, HTM 2A based hole only device (HOD) revealed higher hole mobility of 5.3* 10-4 cm2 V-1 s-1 and which is more suitable candidate for hole transporting materials. |
