兼具優(yōu)異電荷傳輸和有效固態(tài)發(fā)光性能的有機(jī)半導(dǎo)體對(duì)于有機(jī)發(fā)光晶體管的構(gòu)筑和有機(jī)電泵激光的最終實(shí)現(xiàn)具有重要的意義，也是構(gòu)建光電多功能有機(jī)共晶的重要途徑。但是，這類材料的制備具有很大的挑戰(zhàn)性：電荷傳輸性能優(yōu)異的材料需要分子緊密的堆積和強(qiáng)的分子間相互作用，而分子間的強(qiáng)相互作用通常會(huì)導(dǎo)致固態(tài)發(fā)光的淬滅。
前期工作中研究者發(fā)現(xiàn)2,6-二苯基蒽具有高遷移率和高發(fā)光效率，實(shí)現(xiàn)了同一種材料的光電集成，進(jìn)一步在蒽的2,6-位引入萘環(huán)擴(kuò)展其共軛性，合成了2,6-二（2-萘基）蒽（dNaAnt）。該分子采取J聚集模式，具有較好的固態(tài)發(fā)光量子效率（29.2%）；π共軛的延展和緊密的堆積使其具備優(yōu)異的電荷傳輸性能（µSC = 12.3 cm2·V-1·s-1），其HOMO能級(jí)與金電極功函能較好的匹配，具有較小的接觸電阻和較低的閾值電壓（VT ≤10 V）。最后構(gòu)筑基于該分子的發(fā)光場(chǎng)效應(yīng)晶體管，獲得了良好的雙極型傳輸（μh = 1.10 cm2·V-1·s-1, μe = 0.87 cm2·V-1·s-1），同時(shí)可以通過(guò)調(diào)控電壓對(duì)發(fā)光區(qū)域進(jìn)行調(diào)控，這是目前發(fā)光晶體管最好的性能之一，為兼具電荷傳輸和固態(tài)發(fā)光的有機(jī)半導(dǎo)體分子設(shè)計(jì)提供了指導(dǎo)依據(jù)。
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.
天津大學(xué)
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
