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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Highly Efficient Blue Organic Light-Emitting Devices Based on Improved Guest/Host Combination
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Highly Efficient Blue Organic Light-Emitting Devices Based on Improved Guest/Host Combination

机译：基于改进的来宾/宿主组合的高效蓝色有机发光器件

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摘要

We present here a cruciform oligo(phenylenevinlyene) 2,5,2',5'-tetrastyrylbiphenyl (TSB) exhibits excellent properties as host material for blue emitting guest molecule 1,4-ch(4'-N,N-diphenylaminostyryr)benzene (DPA—DSB). TSB, which is constructed by linking two rigid distyrylbenzene (DSB) through the phenyl—phenyl bond, shows good optical and electronic properties e.g. high photoluminescent (PL) efficiency and wide band gap similar to DSB. Meanwhile, the central biphenyl core in TSB, which allows the relatively free rotation of two DSB segments along the biphenyl bond, makes it to be conformational multiformity and relatively flexible. As the result, TSB shows the good film forming property and larger loading ability to the guest molecules. The PL efficiencies of guest—host films of DPA—DSB and TSB arrive at the high level around 70% (68% for the 2 wt % DPA-DSB doped film and 72% for the 8 wt % DPA-DSB doped film), which is approaching the PL efficiency of the guest DPA-DSB in dilute solution (78%), indicating that the host TSB can sufficiently disperse the guest DPA-DSB with little aggregation. The organic light-emitting devices using DPA-DSB (2 wt %) doped TSB as blue emitting layer show the maximum efficiency of 12.2 cd/A (6.2%) and 6.39 lm/W, and the maximum brightness of 17350 cd/m~2. Upon further analysis, it has been revealed that the Forster energy transfer and charge trapping are demonstrated to cooperatively work in this doping system.
机译：我们在这里提出一个十字形的低聚（苯撑乙烯）2,5,2'，5'-四苯乙烯基联苯（TSB）作为发蓝光的客体分子1,4-ch（4'-N，N-二苯基氨基苯乙烯）苯的主体材料表现出优异的性能（DPA-DSB）。 TSB是通过苯-苯基键连接两个刚性二苯乙烯基苯（DSB）而成，具有良好的光学和电子性能，例如类似于DSB的高光致发光（PL）效率和宽带隙。同时，TSB中的中心联苯核心允许两个DSB链段沿联苯键相对自由旋转，从而使其具有构象多态性且相对灵活。结果，TSB显示出良好的成膜性和对客体分子的更大的负载能力。客体-DPA-DSB和TSB主体膜的PL效率达到70％左右的高水平（2 wt％的DPA-DSB掺杂膜为68％，DPA-DSB的8 wt％掺杂膜为72％），这接近客体DPA-DSB在稀溶液中的PL效率（78％），表明宿主TSB可以以很少的聚集充分分散客体DPA-DSB。使用DPA-DSB（2 wt％）掺杂的TSB作为蓝色发光层的有机发光器件显示最大效率为12.2 cd / A（6.2％）和6.39 lm / W，最大亮度为17350 cd / m〜 2。经过进一步的分析，已经发现，Forster的能量转移和电荷俘获被证明在该掺杂系统中协同工作。

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