Alkyl Chain Introduction: In Situ Solar‐Renewable Colorful Organic Mechanoluminescence Materials

Abstract

Mechanoluminescence (ML) materials are environmentally friendly and emit light by utilizing mechanical energy. This has been utilized in light sources, displays, bioimaging, and advanced sensors. Organic ML materials are strongly limited to application by in situ unrepeatable ML. Now, in situ solar-renewable organic ML materials can be formed by introducing a soft alkyl chain into an ML unit. For the first time, the ML from these polycrystalline thin films can be iteratively produced by simply recrystallizing the fractured crystal in situ after a contactless exposure to sunlight within a short time (≤60 s). Additionally, their ML color and lifetime can be also easily tuned by doping with organic luminescent dyes. Therefore, large-area sandwich-type organic ML devices can be fabricated, which can be repeatedly used in a colorful piezo-display, visual handwriting monitor, and sensitive optical sensor, showing a lowest pressure threshold for ML of about 5 kPa.

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

“…Among them,o rganic luminescentm aterials( OLMs) have several advantages, such as good chemical stability,f inely tuned molecular structures,e xcellent luminescent performance, and also impressiveb iocompatibility,a nd in recent years they have been widely applied in the fields of detection, lighting, displays,a nd also imaging. [18][19][20][21][22][23][24] However,i ts hould be mentioned that owingt ot he low vapor pressures of explosive materials such as PA,m ost fluorescencep robes employed for the detection of explosive materials are welld issolved in the solutions tate, in whiche missive features can usually be achieved.H owever, high brightnessi nt he solid state is requiredf or LFP visualization. Thus, if fluorescence probes are to be used for both PA detection and LFP visualization, ad ual-state emission platform in both solution and the aggregate state should be developed.…”

“…There is no doubt that fluorescence probes are a key factor in improving the performances of sensors in detection and also visualization. Among them, organic luminescent materials (OLMs) have several advantages, such as good chemical stability, finely tuned molecular structures, excellent luminescent performance, and also impressive biocompatibility, and in recent years they have been widely applied in the fields of detection, lighting, displays, and also imaging . However, it should be mentioned that owing to the low vapor pressures of explosive materials such as PA, most fluorescence probes employed for the detection of explosive materials are well dissolved in the solution state, in which emissive features can usually be achieved.…”

Multistimuli Response and Polymorphism of a Novel Tetraphenylethylene Derivative

“…Fluorescence upon external stimuli is a most commonly used property that has the advantage of easy detection and low cost. Stimuli‐responsive luminescent materials are gaining more and more scientific and technological interest in recent years due to their potential applications as sensors or probes, anti‐counterfeiting, mechanochromic materials, mechanoluminescent materials, etc. Most of the reported luminescent molecules with stimuli‐responsive property are single‐functioned, that is, they only respond to a single stimulus.…”

Organic Functional Molecule‐Based Single‐Crystalline Nanowires for Optical Waveguides and Their Patterned Crystals

“…In addition, compared to the corresponding amorphous or polycrystalline thin films, organic single crystals exhibited much better device performance due to their lower defect density and fewer undesirable grain boundary, which could largely inhibit the recombination of the excitons and then accelerate effective charge transport . These properties endowed organic functional micro/nanomaterials rich scientific and practical space in many frontiers of information technology, display technology, and biomedicine, such as photodetector, organic field‐effect transistors, organic laser, organic light‐emitting devices, optical waveguides, and sensors . Up to now, various solution‐patterning techniques have been developed for the scale‐up fabrication of organic architectures with controllable position, geometry, and size, such as soft lithography, inkjet printing, and nanoimprinting …”