文摘
A novel N-phenyl carbazole substituted 2, 4,6-trisphenyl-triazine host material(TPCPZ) for solution processed green phosphorescent organic light-emitting devices (PhOLEDs) was synthesized by a Suzuki-cross coupling reaction. The optical, electrochemical and thermal properties of TPCPZ have been characterized. TPCPZ exhibits a high glass transition temperature of 165聽掳C and a triplet energy of 2.63聽eV. The appropriate HOMO energy level (鈭?.39聽eV) and LUMO energy level (鈭?.16聽eV) matching with the HOMO energy level of PEDOT:PSS(鈭?.35聽eV) and the LUMO energy level of Cs2CO3/Al bilayer cathode (鈭?.2聽eV), facilitate the transfer of holes and electrons. The solution-processed single-layer device using TPCPZ as the host for fac-tris(2-(4-phenylpyridine)iridium (Ir(ppy)3) exhibited a low turn-on voltage of 3.5聽V, a maximum current efficiency of 20.8聽cd聽A鈭? and a maximum luminance of 18,000聽cd聽m鈭?. These results demonstrated that TPCPZ as a host material is advantageous for fabrication of highly efficient single-layer green PhOLEDs.