Bifluorene compounds containing carbazole and/or diphenylamine groups and their bipolar charge transport properties in organic light emitting devices
Bifluorene compounds containing carbazole and/or diphenylamine groups and their bipolar charge transport properties in organic light emitting devices
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DOI：
10.1016/j.orgel.2010.01.010
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发表时间：
2010-05
影响因子：
3.2
通讯作者：
Keiji Noine;Yong‐Jin Pu;K. Nakayama;J. Kido
中科院分区：
文献类型：
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作者：
Keiji Noine;Yong‐Jin Pu;K. Nakayama;J. Kido
以钯为催化剂，通过C-C和C-N偶联反应合成了含咔唑和/或二苯胺基的新型双极性双茂金属化合物。化合物的电离势反映了取代基吸电子或给电子的性质。这些化合物的电荷输运性质是通过飞行时间的瞬时光电流测量来评估的。观察到基于空穴和电子的大的暂态电流(10−，4-10−，3cm2/vs)。含有这些化合物的p型掺杂MoO_3和n型掺杂Cs的空穴或纯电子器件表现出欧姆电流密度-电压特性。含有双荧烯化合物(ITO/双荧烯：MoO(50mol%，20 nm)/双荧烯(10 Nm)/双荧烯：Rubrene(60 Nm)/双荧烯(10 Nm)/双荧烯：CS(30wt.%，20 nm)/Al)的同结有机电致发光器件的外量子效率为1.5-2.0%。
Novel bipolar bifluorene compounds containing carbazole and/or diphenylamine groups were synthesized by C–C and C–N coupling using a palladium catalyst. The ionization potentials of the compounds reflected the electron withdrawing or donating nature of the substituents. The charge transport properties of these compounds were evaluated from time-of-flight transient photocurrent measurements. Large transient currents (10−4–10−3cm2/Vs) based on holes and electrons were observed. Hole or electron-only devices containing these compounds with p-type doping with MoO3and n-type with Cs showed Ohmic current density–voltage characteristics. Organic light emitting devices with homo-junction structures containing the bifluorene compounds (ITO/bifluorene:MoO3(50mol%, 20nm)/bifluorene (10nm)/bifluorene:rubrene (60nm)/bifluorene (10nm)/bifluorene:Cs (30wt.%, 20nm)/Al) exhibited external quantum efficiencies of 1.5–2.0%.