Dual-state emission and solvatofluorochromism properties of facile squaraine dyes with cis-3,5-dimethylpiperidine

Alkyl-Engineered Dual-State Luminogens with Pronounced Odd–Even Effects: Quantum Yields with up to 48% Difference and Crystallochromy with up to 22 nm Difference

“…The blue shift in emission could be a result of the increasing conformational twisting weakening the ICT effect in the aggregates while in the meantime the restriction of intramolecular rotation activates the aggregate emission by suppressing the non-irradiative decay . The strong aggregate emission combined with the bright solution emission suggests that these luminogens are intense DSEgens …”

“…40 The strong aggregate emission combined with the bright solution emission suggests that these luminogens are intense DSEgens. 41 The powder FL spectra of C1−C8 and their photographs under UV illumination are shown in Figure 3a,b, and the corresponding Φ p and maximum PL peak position are summarized in Table S1. The Φ p was obtained through an integrating sphere.…”

Fusing rigid planar units to engineer twisting molecules as dual-state emitters

“…12 A different type of luminogen that shows strong luminescence only in the aggregate form was identified by Tang's lab in 2001, 13 which has since been coined as aggregation-induced emission (AIE) attributed to the prohibited bond rotation and vibration in the aggregate state. 14 The applications of the two types of luminogens are restricted to their respective phases. The design and development of luminogens with dual-state emission, referred to as DSEgens, 15 can achieve intense emission in both the solution and solid phases that are unattainable by the ACQ and AIE molecules and are anticipated to bridge the gap.…”

D–A–D structured triphenylamine fluorophore with bright dual-state emission for reversible mechanofluorochromism and trace water detection

“…Recently, there is growing interest in developing dual-state emission (DSE) materials that show strong fluorescence in both dilute solutions and the solid state (nanoparticles, solid powders, crystals, and thin film), to bridge the gap between ACQ and AIE materials. [20][21][22][23][24][25][26][27][28] Nevertheless, available DSE materials are still very rare, and the design principle is not well understood. An understanding of the synthesis and the working mechanisms of new DSE materials is essential to facilitate widespread applications.…”