Meta-linked CBP-derivatives as host materials for a blue iridium carbene complex
Meta-linked CBP-derivatives as host materials for a blue iridium carbene complex
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DOI：
10.1016/j.orgel.2011.08.012
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发表时间：
2011-12-01
影响因子：
3.2
通讯作者：
Strohriegl, Peter
中科院分区：
文献类型：
--
作者：
Schroegel, Pamela;Langer, Nicolle;Strohriegl, Peter
我们提出了四种4,40-双（9-咔唑基）联苯（CBP）衍生物，用于蓝色磷光有机发光二极管的宿主材料。将中心联苯单元上的咔唑取代基的对链替换为元链，得到了热学性质和光学性质都有改善的材料。元连接的宿主材料的三重态能量显著增加到2.90 eV以上，而准连接的CBP则为2.58 eV。此外，选择性甲基取代基本的meta-CBP结构导致材料具有高达120℃的高玻璃化转变温度和氧化物质抗二聚化的电化学稳定性。高三重态能量使得元cbp衍生物可以作为碳发射器mer-tris（n -二苯并呋喃- n '-甲基咪唑）铱（III） （Ir(dbfmi)）的主体材料，在450 nm处具有纯蓝色发射。(C) 2011 Elsevier b.v.版权所有
We present four derivatives of 4,40-bis(9-carbazolyl) biphenyl (CBP) for the use as host materials in blue phosphorescent organic light emitting diodes. By replacing the para-linkage by a meta-linkage of the carbazole substituents at the central biphenyl unit materials with improved thermal and optical properties are obtained. The triplet energy of the meta-linked host materials is significantly increased to more than 2.90 eV compared to 2.58 eV for the para-linked CBP. Moreover, selective methyl substitution of the basic meta-CBP structure leads to materials with high glass transition temperatures up to 120 degrees C and electrochemical stability of the oxidised species against dimerisation. The high triplet energy allows the use of the meta-CBP derivatives as host materials for the carbene emitter mer-tris(N-dibenzofuranyl-N'-methylimidazole) iridium (III) (Ir(dbfmi)) with a pure blue emission at 450 nm. (C) 2011 Elsevier B. V. All rights reserved.