Naslov
Tetraphenylbenzosilole: An AIE Building Block for Deep-Blue Emitters with High Performance in Nondoped Spin-Coating OLEDs

Autori
Feng, Weiqiang ; Ma, Yao ; Džolić, Zoran ; Huang, Fei ; Wang, Zhiming ; Chen, Shuming ; Tang, Ben Zhong

Izvornik
Journal of organic chemistry (0022-3263) 85 (2020); 158-167

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
AIE ; OLED, benzosilole

Sažetak
1, 1, 2, 3, 4, 5-Hexaphenylsilole (HPS) is a star building block of aggregation-induced emission luminogens (AIEgens) in constructing OLED emitters. However, their development is obstructed by their complicated preparation and difficulty of achieving blue/deep-blue emission via structure modification and tuning. In this study, a benzo- group modification strategy was adopted to increase the skeleton rigidity and reduce the vibrational−rotational motion of peripheral substituted phenyl groups. The resulting building block, named tetraphenylbenzosilole (TPBS), was synthesized easily via a silyl radical cascade process with intermolecular radical cyclization. After the structure of the reaction substrate was tuned, four TPBS-based derivatives were obtained which not only inherited AIE characteristics from HPS but also exhibited high-efficiency deep-blue emission in the aggregated state thanks to their tuned HOMOs/LUMOs. Similar to HPS, propeller-like conformations in their single crystals were observed. In nondoped spin-coating OLEDs, these AIEgens all exhibited satisfactory performance with high EQEs (3.1−3.6%) at CIE coordinates of (0.15, 0.10), the best result reported so far for spin-coating-type AIEgens in blue nondoped OLEDs. All of the data showed the feasibility of our strategy for solving the shortage of AIEgens serving as building blocks for deep-blue emitters. We foresee the development of systems based on TPBS or its derivative materials inspired by this work.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

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