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Domino-like multi-emissions across red and near infrared from solid-state 2-/26-aryl substituted BODIPY dyes

机译:固态2- / 26-芳基取代的BODIPY染料在红色和近红外光范围内出现类似Domino的多发射

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摘要

Considerable achievements on multiple emission capabilities and tunable wavelengths have been obtained in inorganic luminescent materials. However, the development of organic counterparts remains a grand challenge. Herein we report a series of 2-/2,6-aryl substituted boron-dipyrromethene dyes with wide-range and multi-fluorescence emissions across red and near infrared in their aggregation states. Experimental data of X-ray diffraction, UV–vis absorption, and room temperature fluorescence spectra have proved the multiple excitation and easy-adjustable emission features in aggregated boron-dipyrromethene dyes. Temperature-dependent and time-resolved fluorescence studies have indicated a successive energy transfer from high to step-wisely lower-located energy levels that correspond to different excitation states of aggregates. Consistent quantum chemical calculation results have proposed possible aggregation modes of boron-dipyrromethene dyes to further support the above-described scenario. Thus, this study greatly enriches the fundamental recognition of conventional boron-dipyrromethene dyes by illustrating the relationships between multiple emission behaviors and the aggregation states of boron-dipyrromethene molecules.
机译:在无机发光材料中,在多种发射能力和可调波长方面取得了相当大的成就。然而,有机同行的发展仍然是一个巨大的挑战。在这里,我们报告了一系列的2- / 2,6-芳基取代的硼-二吡咯亚甲基染料,在其聚集态下具有跨越红色和近红外的宽范围和多荧光发射。 X射线衍射,UV-vis吸收和室温荧光光谱的实验数据证明了聚集的二吡咯甲烷亚硼酸染料具有多重激发和易于调节的发射特性。温度相关的和时间分辨的荧光研究表明,能量从高到逐步降低的能级依次转移,这些能级对应于聚集体的不同激发态。一致的量子化学计算结果提出了硼二吡咯亚甲基染料的可能聚集模式,以进一步支持上述情况。因此,本研究通过阐明多重发射行为与硼二吡咯亚甲基分子的聚集状态之间的关系,极大地丰富了常规硼二吡咯亚甲基染料的基本认识。

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