Constructing small molecular AIE luminophores through a 2,2-(2,2-diphenylethene-1,1-diyl)dithiophene core and peripheral triphenylamine with applications in piezofluorochromism, optical waveguides, and explosive detection

Abstract

Constructing small molecular AIE luminophores through heterocycle-based core with applications in piezofluorochromism, optical waveguide, and explosive detection.

2,5‐Dimethoxybenzene‐1,4‐dicarboxaldehyde: An Emissive Organic Crystal and Highly Efficient Fluorescent Waveguide

“…The α was thus calculated to be 0.00120 dB/μm (Figure d). It is note that α value is relatively high in those of reported materials . The loss coefficient and red‐shift are mainly affected by the reabsorption during the propagation of the light along the crystal .…”

“…Unexpectedly, we found that the high quality single crystal exhibited unique fluorescent waveguide [20][21][22] ability (Figure 4a, i-v). On the other hand, crystal with several cracks inside did not show this ability due to lack of anisotropic character in macroscopic scale ( Figure S6).…”

“…It is note that α value is relatively high in those of reported materials . The loss coefficient and red‐shift are mainly affected by the reabsorption during the propagation of the light along the crystal . In the region of short wavelength, the emission band overlaps with the absorption band of the crystalline powder and the excitation spectrum of the crystal (Figure a), which is harmful for the light propagation and results in a high loss coefficient.…”

“…The fluorescence intensities at the excited site (I in ) and the emitting tip (I out ) were recorded to calculate the optical loss coefficient by a single exponential fitting (I in /I out = Ae (À αX) , where X is the distance between the excited site and the emitting tip and α is the loss coefficient). [23][24][25][26][27][28][29] The α was thus calculated to be 0.00120 dB/μm (Figure 4d). It is note that α value is relatively high in those of reported materials.…”

Structural Insights Into 9‐Styrylanthracene‐Based Luminophores: Geometry Control Versus Mechanofluorochromism and Sensing Properties

“…In contrast,t he ground state displays weaker diffraction peaks suggesting ad isturbed molecular arrangement. [28] The sharp and strong peaks can be restored after fuming by dichloromethane, indicating the recovery of the ordered states. Additionally,t he DSC curves of ground powders of TVA, CPVA,a nd DTVA show clear exothermic transitionp eaks at 85 8C, 99 8C, and 243 8C, respectively,w hich can be ascribed to their coldcrystallization process ( Figure S7).…”