Mingi Kim, Kanghee Cho, Yung Ju Seo, Junhyeok Choi, Namkyun Kim, Ilsup Shin, Kang Mun Lee
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A geometric key for enhancing the radiative efficiency of ortho-carboranyl luminophores: Indolocarbazole- and m-terphenyl-ortho-carboranes
In this study, we introduce two ortho-carboranyl compounds, namely ICzCB and mTPCB, which exhibit different planarity in their appended π-conjugated aromatic groups, to investigate the influence of geometric effects on the regulation of the radiative efficiency. Both the compounds are fully characterized, revealing distinct geometric differences (planarity) in their single-crystal structures. While ICzCB presents strong ICT-based emission in the solid (film) state, mTPCB displays dual emission in the high- and low-energy regions that originates from locally excited (LE)- and ICT-based processes, respectively. Quantitative analysis of the photophysical characteristics of the compounds shows that the ICT-based radiative efficiency in ICzCB is higher than that in mTPCB. Consequently, these findings demonstrate that the planarity of the π-conjugated aryl group appended on o-carborane, which is represented by planar ICzCB and distorted mTPCB, is an important key to control the ICT-based radiative decay efficiency.
期刊介绍:
The Bulletin of the Korean Chemical Society is an official research journal of the Korean Chemical Society. It was founded in 1980 and reaches out to the chemical community worldwide. It is strictly peer-reviewed and welcomes Accounts, Communications, Articles, and Notes written in English. The scope of the journal covers all major areas of chemistry: analytical chemistry, electrochemistry, industrial chemistry, inorganic chemistry, life-science chemistry, macromolecular chemistry, organic synthesis, non-synthetic organic chemistry, physical chemistry, and materials chemistry.