Core–Shell Fluorescent Polymeric Particles with Tunable White Light Emission Based on Aggregation Microenvironment Manipulation

Abstract

White-light emitting polymers (WLEPs) based on aggregation microenvironment-sensitive aggregation-induced emission (AIE) and Fçrster resonance energy transfer (FRET) have aroused great interest in lighting and optoelectronic devices. Herein, we developed a novel strategy to construct WLEP particles via a stepwise self-stabilized precipitation polymerization of two emission-complementary AIEgens under core-shell engineering, where the AIE characteristics and FRET process of core-shell fluorescent polymeric particles (CS-FPPs) could be modulated by altering aggregation microenvironment under swelling and shrinking of polymers, facilitating the tunable white light emission of CS-FPPs. Furthermore, such tuning could be fast realized in the solid state, thus demonstrating the potential in anti-counterfeiting. This work proved the significance of aggregation microenvironment on emission of luminogens, guiding the development of high-efficiency emission-tunable materials.

Thieno[3,4‐c][1,2,5]Thiadiazole‐Based Organic Conjugated Molecules with Visible and Near‐Infrared Dual Emissions for Luminescent Anti‐Counterfeiting Applications

“…Measurements: 1 H NMR and 13 C NMR spectra were conducted on a Bruker ARX 400 MHz spectrometer. Mass spectra were performed on a GCT Premier CAB 048 mass spectrometer.…”

“…1 H NMR (400 MHz, CD 2 Cl 2 , 298K) δ (ppm): 9.91 (s, 4H), 7.80 (d, J = 8.6 Hz, 8H), 7.68 (d, J = 8.5 Hz, 4H), 7.61 (d, J = 3.9 Hz, 2H), 7.38 (d, J = 3.9 Hz, 2H), 7.25 (d, J = 8.6 Hz, 8H), 7.21 (d, J = 8.6 Hz, 4H). 13 Synthesis of TTD-TPA: Under N 2 atmosphere, 4,6-bis(5-bromo-2thienyl)thieno [3,4-c][1,2,5]thiadiazole (0.10 g, 0.21 mmol), N,N-Diphenyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)aniline (0.31 g, 0.83 mmol), Pd(PPh 3 ) 4 (0.10 g, 0.09 mmol) and K 2 CO 3 (0.46 g, 3.31 mmol) were added to a 50 mL two-necked flask. Then 12 mL THF/H 2 O was injected into the flask.…”

“…[ 12 ] For example, our previous work has established a multilevel fluorescent anti‐counterfeiting method by using the core–shell fluorescent polymeric particles whose emission color could be tuned by altering the aggregation microenvironment under swelling and shrinking of polymers. [ 13 ] However, the multilevel luminescence anti‐counterfeiting strategies always suffered from the difficulty of material design and complicated preparation process, making it difficult to be promoted in practical applications. Sometimes, for example, during transfer and storage of banknotes, disclosing the security information for a long time when using the persistent luminescence for anti‐counterfeiting is unreasonable.…”

An unexpected dual-emissive luminogen with tunable aggregation-induced emission and enhanced chiroptical property

“…However, in the literature, materials with both AIE and ACQ effects that can emit both in the solution and aggregated state are rarely reported. The solution and solid dual-emissive luminogens can exactly fill the gap between ACQ and AIE materials, providing many interesting properties such as stimuli-responsive fluorescence and white-light emission 12 – 16 . Most of the AIE systems have been identified on the basis of intensity turn-on at a specific wavelength.…”

Fluorescence Resonance Energy Transfer Aptasensor of Ochratoxin A Constructed Based on Gold Nanorods and DNA Tetrahedrons

“…The commonly used signal amplification methods are rolling circle amplification, , hybridization chain reaction, and target-catalyzed hairpin assembly technology, which require the design of complicated DNA sequences or expensive enzymes. Nanoparticles with specific morphologies, such as upconversion nanoparticles, , metal–organic frameworks and core–shell nanoparticles, − are often sophisticated and hard to prepare. Thus, they are not conducive to the establishment of rapid detection methods.…”