White light emission from AIE‐active luminescent organic materials

Abstract

Fluorescent organic materials that exhibit unique aggregation‐induced emission have been utilized for various applications, including white light emission (WLE). The materials typically rely on composite designs involving a mixture of compounds emitting at different wavelengths of light. To overcome the limitations offered by the design of such composite mixtures, tremendous efforts were also emphasized in developing single‐molecule substrates that emit white light. The white light by either method is typically controlled by the solvent polarity, energy and charge transfer, host‐guest interactions, gelation, or embedding in the polymer or organic frameworks. This article briefly reviews various molecules exhibiting aggregation‐induced emission behavior and emitting white light.

α-Cyanostilbene: a multifunctional spectral engineering motif

“…The development of white light-emissive (WLE) organic materials is an ever-increasing demand in the commercial market of display technologies, which typically rely on composite designs involving a mixture of compounds emitting at different wavelength. 113 We reported three TPA-based a-CS derivatives (SK34-SK36) possessing a tunable band gap upon increasing the electron acceptor strength and correlated their AIE-ICT-ACQ relationship. 114 The band gap narrowing mainly originated from Fig.…”

Effects of nonaromatic through-bond conjugation and through-space conjugation on the photoluminescence of nontraditional luminogens

“…[25] It is known that some diketones can undergo keto-enol tautomerism. 1 HNMR characterization results of these compounds are shown in Figure 5 and S5. In CDCl 3 solutions, 1,4-CHD keeps the diketone structure (Figure 5c).…”

“…Organic photoluminescent materials are widely used in optoelectronic devices, biological and chemical sensing, photodynamic therapy, drug carriers and biological imaging for their unique photophysical properties. [1][2][3][4] Traditional organic luminescent compounds usually contain classic fluorescent chromophores, such as πconjugated benzene rings and/or heterocycle. [5] In recent years, a large number of natural and synthetic small molecules, macromolecules and supramolecules without any aromatic structures have been found to emit intrinsic fluorescence and/or phosphorescence.…”

As Fiber Meets with AIE: Opening a Wonderland for Smart Flexible Materials

“…[23] On the other hand, AIEgens are a big family, which included broadband emission from blue to red, even NIR-II, providing more choices for OLEDs. Many AIEgens with a variety of emissions have been developed, herein, we presented some typical but not limited AIEgens, including red emission (17)(18)(19)), [75][76][77] blue emission (20,21), [78,79] and white emission (22-24) [80][81][82] (Figure 4A). Among them, molecule 17 was first reported by our group, namely TAOs.…”

“…[2] The restriction of intramolecular motion (RIM), including the restriction of intramolecular rotation (RIR) and the restriction of intramolecular vibration (RIV) has been considered as the most adopted primary mechanism to explain the AIE phenomenon. [3][4][5][6] Within the past two decades, benefiting from their incomparable features, such as large Stokes shifts, high photobleaching threshold, high emission in aggregate state together with multi-functional, [7][8][9] AIEgens have been extensively used in bioimaging, [10][11][12][13] theranostics, [14][15][16] chemical sensing, [17][18][19] organic light emitting diodes (OLEDs), [20][21][22][23] and many luminescence-related areas. [24][25][26] Besides, the unique spatial configuration of AIEgens (innate twisted configuration and abundant freely molecular rotators and/vibrators in propeller-like structures) endowed the AIEgens with superior capacities in the generation of photothermal and reactive oxygen species (ROS), [27][28][29][30] making it a potential candidate for energy conversion materials, photothermal and/or photodynamic-related fields.…”