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首页> 外文期刊>Advanced Functional Materials >Monodisperse Starburst Oligofluorene-Functionalized 4,4′,4″-Tris(carbazol-9-yl)-triphenylamines: Their Synthesis and Deep-Blue Fluorescence Properties for Organic Light-Emitting Diode Applications
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Monodisperse Starburst Oligofluorene-Functionalized 4,4′,4″-Tris(carbazol-9-yl)-triphenylamines: Their Synthesis and Deep-Blue Fluorescence Properties for Organic Light-Emitting Diode Applications

机译：单分散星爆低聚芴官能化的4,4'，4”-三（咔唑-9-基）-三苯胺：它们的合成和深蓝色荧光性质，用于有机发光二极管应用

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摘要

Four monodisperse starburst oligomers bearing a 4,4′,4″-tris(carbazoI-9-yl)-triphenylamine (TCTA) core and six oligofluorene arms are synthesized and characterized. The lengths of oligofluorene arms vary from one to four fluorene units, giving the star-burst oligomers molecular weights ranging from 3072 to 10 068 Da (1 Da = 1.66 x 10~27 kg). All of the starburst oligomers have good film-forming capabilities, and display bright, deep-blue fluorescence (λ_(max) = 395-416 nm) both in solution and in the solid state, with the quantum efficiencies of the films (Φ_(PL)) varying between 27 and 88 %. Electrochemical studies demonstrate that these materials have large energy gaps, and are stable for both p-doping and n-doping processes. Electroluminescent devices are successfully fabricated using these materials as hole-transporting emitters, and emit deep-blue light. Devices with luminance values up to 1025 cdm~(-2) at 11 Vand luminous efficiencies of 0.47 cd A~(-1) at 100 cd m~(-2) have been produced, which translates to an external quantum efficiency of 1.4 %. In addition, these large-energy-gap starburst oligomers are good host materials for red electrophosphorescence. The luminance of the red electrophosphorescent devices is as high as 4452 cdm~(-2), with a luminous efficiency of 4.31 cd A~(-1) at 15 mA cm~(-2): This value is much higher than those obtained from the commonly used hole-transporting materials, such as poly(vinyl carbazole) (PVK) (1.10 cd A~(-1) at 16 mA cm~(-2)).
机译：合成并表征了四个带有4,4'，4''-三（咔唑基-9-基）-三苯胺（TCTA）核的单分散星暴低聚物和六个低聚芴臂。低聚芴臂的长度在1至4个芴单元之间变化，星状低聚物的分子量范围为3072至10 068 Da（1 Da = 1.66 x 10〜27 kg）。所有星暴低聚物均具有良好的成膜能力，并且在溶液和固态下均显示明亮的深蓝色荧光（λ_（max）= 395-416 nm），且具有薄膜的量子效率（Φ_（ PL））在27％至88％之间变化。电化学研究表明，这些材料具有较大的能隙，并且对于p型掺杂和n型掺杂工艺均稳定。使用这些材料作为空穴传输发射器成功地制造了电致发光器件，并发出深蓝光。已生产出在11 V时亮度值高达1025 cdm〜（-2）且在100 cd m〜（-2）时发光效率为0.47 cd A〜（-1）的器件，这意味着1.4％的外部量子效率。另外，这些大能隙的爆炸形低聚物是红色电磷光的良好主体材料。红色电致磷光器件的亮度高达4452 cdm〜（-2），在15 mA cm〜（-2）时的发光效率为4.31 cd A〜（-1）：该值远高于获得的值常用的空穴传输材料，例如聚（乙烯基咔唑）（PVK）（在16 mA cm〜（-2）时为1.10 cd A〜（-1））。

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