Efficient deep-blue organic light-emitting diodes: Arylamine-substituted oligofluorenes
Efficient deep-blue organic light-emitting diodes: Arylamine-substituted oligofluorenes
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DOI：
10.1002/adfm.200700238
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发表时间：
2007-11-05
影响因子：
19
通讯作者：
Chen, Chin H.
中科院分区：
文献类型：
--
作者：
Gao, Zhi Qiang;Li, Zhong Hui;Chen, Chin H.
以二溴低聚芴和相应的硼酸为关键步骤，通过双钯催化Suzuki偶联反应合成了新型深蓝色发光的二苯胺和三苯胺封端的低聚芴。这些低聚芴表现出深蓝色的发射（λ（em）（max）= 429-432 nm），低且可逆的电化学氧化（最高占据分子轨道= 5.15-5.20 eV）、高荧光量子产率（Phi（FL）= 0.61-0.93）和良好的热性质（玻璃化转变温度，T-g = 99-195 ℃，分解温度，T-dec > 450 ℃）。值得注意的是，饱和深蓝色有机发光二极管，由这些低聚芴作为掺杂剂发射体，已取得了优异的性能和最高效率高达2.9 cd A（-1）在2 mA cm（-2）（外部量子效率为4.1%），并且具有国际照明委员会（Commission Internationale de l 'Eclairage）（x，y）坐标，（0.152，0.08），非常接近国家电视制式委员会标准蓝。
Novel deep-blue-light-emitting diphenylamino and triphenylamino end-capped oligofluorenes were synthesized by double palladium-catalyzed Suzuki cross- coupling of dibromo-oligofluorene with the corresponding boronic acid as a key step. These oligofluorenes exhibit deep-blue emission (lambda(em)(max) = 429-432 nm), low and reversible electrochemical oxidation (highest occupied molecular orbital = 5.15-5.20 eV), high fluorescence quantum yield (Phi(FL) = 0.61-0.93), and good thermal properties (glass-transition temperature, T-g = 99-195 degrees C and decomposition temperature, T-dec > 450 degrees C). Remarkably, saturated deep-blue organic light-emitting diodes, made from these oligofluorenes as dopant emitters, have been achieved with excellent performance and maximum efficiencies up to 2.9 cd A(-1) at 2 mA cm(-2) (external quantum efficiency of 4.1 %) and with Commission Internationale de l'Eclairage (x,y) coordinates of (0.152,0.08), which is very close to the National Television System Committee standard blue.