| 초록 |
Triphenylamine based four hole transporting materials namely, 4a, 4b, 5a and 5b were designed and synthesized by using Suzuki cross coupling reaction. All synthesized materials were revealed higher thermal stabilities except HTM 4a. HOMO levels of all materials were lying between 5.38 eV to 5.44 eV and were match with the adjacent layers to ensure the charge hopping pathway. Further properties were investigated after OLED device fabrication. HTM 5a based device was shown similar current ( 28.4 cd/A) and power (22.3 lm/W) efficiencies with NPB based reference device. Device based on HTM 4a and 4b wereexhibited poor efficiencies when compared with other HTM based devices. |
