Exciplex emission from electroluminescent ladder-type pentaphenylene oligomers bearing both electron- and hole-accepting substituents.
Exciplex emission from electroluminescent ladder-type pentaphenylene oligomers bearing both electron- and hole-accepting substituents.
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DOI：
10.1063/1.2813351
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发表时间：
2008-01
期刊：
影响因子：
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通讯作者：
C. Finlayson;Ji‐Seon Kim;M. Liddell;R. Friend;Sung‐Hyun Jung;A. Grimsdale;K. Müllen
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文献类型：
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作者：
C. Finlayson;Ji‐Seon Kim;M. Liddell;R. Friend;Sung‐Hyun Jung;A. Grimsdale;K. Müllen
我们研究了梯形pentaphenylenes，这已被制备为原型的“所有在一个”的发射材料轴承电子接受（二芳基恶二唑）和电子给（三苯胺）单位的物理性质。我们发现，供体-受体的相互作用是非常依赖于这些基团的连接到主pentaphenylene链的性质。当恶二唑和三苯胺单元被取代的π-共轭pentaphenylene发色团的相对侧上，观察到具有长寿命的典型的激基复合物样物质的光致发光，而被显着淬灭的取代基之间的分子间电荷分离。相比之下，当三苯胺单元连接在发色团的末端时，没有观察到这样的效果，并且以非常高的量子效率获得蓝/绿色光致发光。在后一种配置中，另外观察到双极电荷传输和蓝色/绿色电致发光的证据。
We examine the photophysical properties of ladder-type pentaphenylenes, which have been prepared as prototypical "all-in-one" emissive materials bearing both electron-accepting (diaryloxadiazole) and electron-donating (triphenylamine) units. We find that donor-acceptor interactions are very dependent on the nature of the connectivity of these groups to the main pentaphenylene chain. When the oxadiazole and triphenylamine units were substituted on opposite sides of the pi-conjugated pentaphenylene chromophore, photoluminescence with long lifetimes typical of exciplex-like species was observed, while being significantly quenched by intermolecular charge separation between the substituents. By contrast, when the triphenylamine units were attached at the ends of the chromophore, no such effects were observed and a blue/green photoluminescence was obtained with very high quantum efficiency. In this latter configuration, evidence of ambipolar charge transport and a blue/green electroluminescence were additionally observed.