Rational design strategies for nonconventional luminogens with efficient and tunable emission in dilute solution

合理设计 工艺工程 化学 聚集诱导发射 纳米技术 材料科学 计算机科学 物理 工程类 光学 荧光
作者
Ji Luo,Song Guo,Feixia Chen,Bingli Jiang,Lingzhong Wei,Yongyang Gong,Beibei Zhang,Yuanli Liu,Chun Wei,Ben Zhong Tang
出处
期刊:Chemical Engineering Journal [Elsevier]
卷期号:454: 140469-140469 被引量:6
标识
DOI:10.1016/j.cej.2022.140469
摘要

• Molecular design strategies for efficient luminescence of nonconventional luminogens were established. • The photoluminescence efficiency of nonconventional luminescent small molecules reached 59.8%. • First report of nonconventional luminescent materials for targeting lysosomes. The design and synthesis of organic nonconventional luminescent (NL) materials with efficient emission have attracted significant attention. However, these materials usually suffer from the fact of low photoluminescent quantum efficiency ( Φ ), poor tunability of emission wavelength, and non-luminescence in dilute solution, limiting their further application. Herein, rational molecular design strategies for NL compounds with efficient and tunable emission in dilute solution were presented via theoretical calculation and practical verification. Firstly, increasing the ratio of π→π* transition in the excited state to suppress the n→π* transition, inhibit intersystem crossing, and avoid the generation of triplet excitons which can be easily quenched by water or oxygen. Secondly, introducing strong intramolecular hydrogen bonds to suppress intramolecular rotation and inhibit non-radiative transitions. Besides, D-π-A structure can effectively adjust the luminescence color. Based on the proposed design strategies, two novel compounds named LJ-1 and LJ-2 were synthesized, both compounds can emit bright green fluorescence in dilute solution with Φ of up to 59.8%, and their photophysical properties are pH-dependent. The results showed that pH had a great impact on the strength of intramolecular hydrogen bonds and the degree of conjugation. For example, the emission wavelength of LJ-1 exhibited red-shift as the increase of pH value. Furthermore, LJ-1 can be used for visual detection of Ag + in water solution in naked eye and the precise localization of lysosomes. We believe that our work will greatly broaden the application range of nonconventional luminogenic compounds in future.
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