兼具优异电荷传输和有效固态发光性能的有机半导体对于有机发光晶体管的构筑和有机电泵激光的最终实现具有重要的意义，也是构建光电多功能有机共晶的重要途径。但是，这类材料的制备具有很大的挑战性：电荷传输性能优异的材料需要分子紧密的堆积和强的分子间相互作用，而分子间的强相互作用通常会导致固态发光的淬灭。
前期工作中研究者发现2,6-二苯基蒽具有高迁移率和高发光效率，实现了同一种材料的光电集成，进一步在蒽的2,6-位引入萘环扩展其共轭性，合成了2,6-二（2-萘基）蒽（dNaAnt）。该分子采取J聚集模式，具有较好的固态发光量子效率（29.2%）；π共轭的延展和紧密的堆积使其具备优异的电荷传输性能（µSC = 12.3 cm2·V-1·s-1），其HOMO能级与金电极功函能较好的匹配，具有较小的接触电阻和较低的阈值电压（VT ≤10 V）。最后构筑基于该分子的发光场效应晶体管，获得了良好的双极型传输（μh = 1.10 cm2·V-1·s-1, μe = 0.87 cm2·V-1·s-1），同时可以通过调控电压对发光区域进行调控，这是目前发光晶体管最好的性能之一，为兼具电荷传输和固态发光的有机半导体分子设计提供了指导依据。
The authors reported a novel anthracene based organic semiconductor with napthyl substituents at 2 and 6 positions. Interestingly this new compound forms J-type of aggregates which enable the molecules to display efficient charge transport coupled with high fluorescence quantum yield in solid state. Using these properties the authors demonstrate the application of this molecule in Organic Light Emitting Transistors, which display impressive peak charge carrier mobility as well as ambipolar transport. This is an interesting phenomenon of spatial control of electroluminescence in the OLET channel by changing the gate voltage.
天津大学
Tianjin University
Aromatic Extension at 2,6-Positions of Anthracene toward an Elegant Strategy for Organic Semiconductors with Efficient Charge Transport and Strong Solid State Emission
2017, Vol. 139, No. 48, 17261-17264
https://pubs.acs.org/doi/10.1021/jacs.7b09381
