Details

Autor(en) / Beteiligte

• Ruan, Zhijun
• Li, Le
• Wang, Can
• Xie, Yujun
• Hu, Quanyuan
• Peng, Qian
• Ye, Shanghui
• Li, Qianqian
• Li, Zhen

Titel

Tetraphenylcyclopentadiene Derivatives: Aggregation-Induced Emission, Adjustable Luminescence from Green to Blue, Efficient Undoped OLED Performance and Good Mechanochromic Properties

Ist Teil von

• Small (Weinheim an der Bergstrasse, Germany), 2016-12, Vol.12 (47), p.6623-6632

Ort / Verlag

Germany: Blackwell Publishing Ltd

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• Silole derivatives, the first reported and famous AIEgens, are a series of Si‐containing conjugated rings with the σ*–π* conjugation, and this unique electronic structure imparts them high electron affinity and fast electron mobility, but not ideal blue luminogens due to their relatively long conjugation length. By replacing the Si atom with the C one, six new AIEgens without the σ*–π* conjugation effect are successfully synthesized based on a tetraphenylcyclopentadiene core. In addition to the sky‐blue emission (λEL = 492 nm) with Lmax, ηC,max, and ηP,max up to 24 096 cd m−2, 6.80 cd A−1, and 4.07 lm W−1, respectively, the careful control of the conjugation degree by changing the linkage mode, results in the blue one (λEL = 440 nm) with relatively good performance (Lmax: 8721 cd m−2 and ηC,max: 3.40 cd A−1), indicating that the replacement of the Si atom by C one is an alternative design strategy to yield blue even deep‐blue AIEgens with good device performance. Meanwhile, their reversible mechanochromic properties are realized with apparent fluorescence changes between deep‐blue and green emissive colors, offering them additional promising applications in optoelectronic devices. Through the replacement of Si by C in silole, and the adjustment of the linkage mode, six aggregation‐induced emission (AIE)gens are successfully synthesized without the σ*–π* conjugated effect. In comparison with silole analogues, they can maintain high performance but much blueshifted emission, providing a new skeleton for the design of blue AIEgens. Meanwhile, they show reversible mechanochromic property with high color contrast.