Luminescence Color Tuning from Blue to Near Infrared of Stable Luminescent Solid Materials Based on Bis-o-Carborane-Substituted Oligoacenes.

Chem Asian J

Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.

Published: August 2017

AI Article Synopsis

  • Aryl-substituted o-carboranes have been found to exhibit highly efficient solid-state emission, leading to the synthesis of bis-o-carborane-substituted oligoacenes for color tuning of emissions.
  • Investigations showed that adding fused benzene rings reduces energy band gaps, allowing for a range of bright emissions from blue to near infrared (NIR).
  • The modified o-carboranes also demonstrated beneficial properties like aggregation-induced emission (AIE) and high quantum efficiency, with one derivative showing durability against UV photo-bleaching.

Article Abstract

Aryl-substituted o-carboranes have shown highly efficient solid-state emission in previous studies. To demonstrate color tuning of the solid-state emission in an aryl-o-carborane-based system, bis-o-carborane-substituted oligoacenes were synthesized and their properties were systematically investigated. Optical and electrochemical measurements revealed efficient decreases in energy band gaps and lowest unoccupied molecular orbital (LUMO) levels by adding a number of fused benzene rings for the extension of π-conjugation. As a consequence, bright solid-state emission was observed in the region from blue to near infrared (NIR). Furthermore, various useful features were obtained from the modified o-carboranes as an optical material. The naphthalene derivatives exhibited aggregation-induced emission (AIE) and almost 100 % quantum efficiency in the crystalline state. Furthermore, it was shown that the tetracene derivative with NIR-emissive properties had high durability toward photo-bleaching under UV irradiation.

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Source
http://dx.doi.org/10.1002/asia.201700815DOI Listing

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