Abstract
The enhancement of aggregation-induced emission (AIE) is presented on the basis of the strategy for improving solid-state luminescence by employing multiple o-carborane substituents. We synthesized the modified triphenylamines with various numbers of o-carborane units and compared their optical properties. From the optical measurements, the emission bands from the twisted intramolecular charge transfer (TICT) state were obtained from the modified triphenylamines. It was notable that emission efficiencies of the multi-substituted triphenylamines including two or three o-carborane units were enhanced 6- to 8-fold compared to those of the mono-substituted triphenylamine. According to mechanistic studies, it was proposed that the single o-carborane substitution can load the AIE property via the TICT mechanism. It was revealed that the additional o-carborane units contribute to improving solid-state emission by suppressing aggregation-caused quenching (ACQ). Subsequently, intense AIEs were obtained. This paper presents a new role of the o-carborane substituent in the enhancement of AIEs.
Highlights
Organic luminescent materials are versatile as a platform for developing opto-electronic devices and optical bioprobes and sensors
To examine the validity of this idea, we focused on triphenylamine substitutions onto benzene induced aggregation-induced emission (AIE) and solid-state luminescence [43]
Results and Discussion triphenylamines with various numbers (1–3) of o-carboranes and compared their optical properties
Summary
Organic luminescent materials are versatile as a platform for developing opto-electronic devices and optical bioprobes and sensors. On the basis of these results, we presumed aryl-modified o-carboranes provided extremely intense luminescence with almost quantitative that the introduction units into the strong unit might be efficiencies, even of inmultiple the solido-carborane state [27,28,29]. To examine the validity of this idea, we focused on triphenylamine substitutions onto benzene induced AIE and solid-state luminescence [43]. The desired products were obtained via insertion of decaborane(14) to Modified triphenylamines with various numbers of o-carborane units were synthesized Significant enhancements the solution solution samples samples enhancements of of emission emission efficiencies efficiencies were were observed, observed, comparing comparing to to those those of of the These results mean that the triphenylamines should be the AIE-active molecules.
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