A new bipolar transport material of 9,9'-(4-(pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole) (2,4-dCzPPy) is designed and synthesized through a simple catalyst free C-N coupling reaction. The carbazole/phenylpyridine hybrid 2,4-dCzPPy is functionalized as dual role of efficient host material and cyclometalated ligands for green emissive Iridium (III) complex of bis(9,9'-(4-(pyridin-2-yl)-1,3-phenylene)bis(9H-carbazole))(acetylacetonato) Ir(dCzPPy)₂(acac). Their thermal, photophysical, electrochemical, and electrolumiescent (EL) properties are fully investigated. The D-π-A structure of bipolar compound of 2,4-dCzPPy suppresses the direct intramolecular interaction between the donor and acceptor subunits to give high triplet energy of 2.70 eV. Besides, solution processable electrophosphorescent devices by using 2,4-dCzPPy/Ir(dCzPPy)₂(acac) as host/dopant to form emissive layers at a dopant concentration of 8 wt% show a maximum luminescence of 28622 cd/m² at 10.3 V and maximum current efficiency of 31.8 cd/A, which is significantly higher than other host/dopant combinations, such as 21 cd/A of 4,4′-bis(9-carbazolyl)biphenyl (CBP):Ir(dCzPPy)₂(acac) and 15 cd/A of 2,4-dCzPPy:tris(2-4-tolyl phenylpyridine) iridium (Ir(mppy)₃), suggesting the well matching of the new host/dopant system which involves 2,4-dCzPPy both as the host matrix and the ligand of phosphorescent emitter.

设计并合成了一种9,9'-（4-（吡啶-2-基）-1,3-亚苯基）双（9 H-咔唑）（2,4-dCzPPy）的新型双极传输材料。游离CN偶联反应。咔唑/苯基吡啶杂化2,4-dCzPPy被功能化为双（9,9'-（4-（吡啶-2-基）-1）的绿色发光铱（III）配合物的高效主体材料和环金属化配体的双重作用，3-亚苯基）双（9H-咔唑））（乙酰丙酮）Ir（dCzPPy）₂（acac）。对它们的热，光物理，电化学和电致发光（EL）特性进行了充分研究。2,4-dCzPPy的双极性化合物的D-π-A结构抑制了供体和受体亚基之间的直接分子内相互作用，从而产生了2.70 eV的高三重态能量。此外，通过使用2,4-dCzPPy / Ir（dCzPPy）₂（acac）作为主体/掺杂剂以形成浓度为8 wt％的发光层的溶液可加工的电致磷光器件在10.3时显示最大发光强度为28622 cd / m ² V和31.8 cd / A的最大电流效率，这明显高于其他主体/掺杂剂组合，例如4,4'-双（9-咔唑基）联苯（CBP）：Ir（dCzPPy）_2的21 cd / A（acac）和15 cd / A的2,4-dCzPPy：tris（2-4-甲苯基苯基吡啶）铱（Ir（mppy）₃），表明涉及2,4的新宿主/掺杂剂系统具有良好的匹配性dCzPPy既是宿主基质，又是磷光发射体的配体。