A Strategy of “Self‐Isolated Enhanced Emission” to Achieve Highly Emissive Dual‐State Emission for Organic Luminescent Materials

Abstract

Currently, the commonly developed organic luminescent materials (OLMs) usually exhibit poor luminescent performance in aggregated solid states compared with their well-dissolved solution states, making it a tough goal to achieve the highly emissive dual-state emission. To overcome this limitation, a "self-isolated enhanced emission" (SIEE) strategy through flexible alkyl chains to suppress the emission-quenched π-π stacking in solids is proposed here and, based on this guideline, remarkable emission efficiency with photoluminescence quantum yields up to 99.72 % in solution and 77.46 % in the solid state are achieved for the SIEE constructed DBBT-C8, which is then successfully used in solid-state displays and data encryption.

Rational Design of Dual‐State Emission Luminogens with Solvatochromism by Combining a Partially Shared Donor–Acceptor Pattern and Twisted Structures

“…One major strategy to design DSEgens is to add conjugation‐induced rigidity in twisted molecules, for which conjugation‐induced rigidity facilitates the emission in solution by suppressing intramolecular rotation and vibration, and twisted structures are used to avoid fluorescence quenching in the solid state caused by π–π stacking . Dual‐state emission can also be attained by incorporating bulk substituents into molecular structures to prohibit π–π stacking in the solid state . A zero‐twist donor–acceptor molecule was also found as a dual‐state emitter, and a recent study showed that D –π–A structures can be used to achieve DSE properties .…”

“…[5][6][7][8][9] Dual-state emissionc an also be attained by incorporating bulk substituents into molecular structurest op rohibit p-p stacking in the solid state. [10] A zero-twist donor-acceptor molecule was also found as ad ualstate emitter, [11] and ar ecent study showed that D-p-A structures can be used to achieve DSE properties. [12] However,t here is no valid design strategy for designing DSEgens with solvatochromism because of the lack of an investigation into the relationship between structure and DSE property.…”

A Facilely Synthesized Dual‐State Emission Platform for Picric Acid Detection and Latent Fingerprint Visualization

“…[27][28][29][30][31] By using these highly emissive AIEgens, dual-state emission can be easily achieved and they have potential real-world applications, [32][33][34] such as in PA detection and LFP visualization. Recently,f lexible alkyl chains were introduced into conventionalf luorescent molecules to prevent close packing of their core structures as well as strong p-p intermolecular stacking interactions, [35][36][37] thereby openingr adiative channels to afford highlye missive features in aggregates.T herefore, based on these considera-tions, to achieve ah ighly efficient dual-state emission platform for PA detection and LFP visualization,i nt his work, flexible alkyl chains were facilelya ttached to the commercial organic dye 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA)t o afford the tetraalkyl 3,4,9,10-perylenetetracarboxylate target compounds PTCA-C4, PTCA-C6, and PTCA-C12 (fort he structures, see Figure 1). As we anticipated, impressive fluorescence characteristics with photoluminescence quantum yields (PLQYs) of up to 95.0, 96.9, and 93.2 %w ereo btained for PTCA-C4, PTCA-C6, and PTCA-C12 in THF solution, respectively.…”

Anthracene derivative based multifunctional liquid crystal materials for optoelectronic devices

“…Firstly, the key intermediate compounds 2-(4-octylphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (2a), 2-(4-octyloxyphenyl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolane (2b) and 2-bromoanthracene (3) were prepared according to previously reported procedures. 38,[40][41][42] Subsequently, the target materials AntPh-C8, AntPh-OC8 and AntPh were synthesized by using 2-bromoanthracene (3) and the corresponding pinathol borate esters (2a, 2b and 2c) via a Suzuki-Miyaura coupling reaction. High-purity materials were obtained by gradient vacuum sublimation two to three times.…”