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首页> 外文期刊>Advanced functional materials >High-Efficiency Solid-State Luminescence from Hydrophilic Carbon Dots with Aggregation-Induced Emission Characteristics
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High-Efficiency Solid-State Luminescence from Hydrophilic Carbon Dots with Aggregation-Induced Emission Characteristics

机译：High-Efficiency Solid-State Luminescence from Hydrophilic Carbon Dots with Aggregation-Induced Emission Characteristics

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摘要

Carbon dots (CDs) have excellent properties and have made great progress insynthesis and applications. However, it is still a challenge to realize convenientpreparation and highly emissive solid-state luminescence without theassistance of matrix. In this study, high-efficiency hydrophilic yellow emissiveCDs (Y-CDs) with aggregation-induced emission (AIE) characteristics are synthesizedby a one-pot microwave method. Y-CDs show weak yellow emissionwith a photoluminescence quantum yield (PLQY) of 6.14% in aqueous solutions,but exhibit a significantly enhanced PLQY of 58.35% in the solid state.The AIE characteristic is confirmed by the phenomenon that the fluorescenceemission intensity of Y-CDs continues to increase with the gradual increaseof the poor solvent fraction. The AIE phenomenon of Y-CDs is derived fromthe suppression of surface piperazine groups motions and decrease of thenon-radiative rate, as is verified by a series of experiments. Finally, based onthe high PLQY and AIE property, Y-CDs are applied as a color-converting layeron blue-light-emitting chips to fabricate white-light-emitting diodes with colorcoordinates of (0.31, 0.35), while Y-CDs are also explored for their potentialapplications in anti-counterfeiting, encryption and bioimaging.

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