Authors
Jingjing Liu, Yanjun Guo, Huan Yang, Yongtao Wang
Published in
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. Volume 367. Issue Pt 1. Pages 128966. Oct 15, 2026. Epub Oct 15, 2026.
Abstract
The development of multifunctional purely organic room-temperature phosphorescence materials remains a formidable challenge. Herein, a pyridine-bromobenzene-based luminogen named NNPA was successfully prepared, integrating both aggregation-induced emission (AIE) activity and pH-dependent fluorescence emission. More importantly, the fluorescence emission maxima of NNPA exhibits a monotonic red shift with increasing water content in THF-H2O mixtures, enabling precise water quantification over a broad range (0-90%). Remarkable acid-triggered fluorescence emission shifts are demonstrated, transitioning from 383 to 520 nm in solution and 390 to 465 nm in the crystalline state. Meanwhile, the ultralong phosphorescence lifetime undergoes a monotonic attenuation with increasing acid concentration, allowing for time-resolved, naked-eye sensing of acid vapors. Crucially, by incorporating Rhodamine B via melt-blending, a red-shifted room-temperature phosphorescence system reaching 655 nm was constructed through a Förster resonance energy transfer (FRET) mechanism, effectively overcoming the inherent wavelength barrier of organic afterglow. Leveraging alcohol solubility and processability of NNPA, eco-friendly flexible afterglow papers were fabricated, enabling advanced information encryption including static covert codes, dynamic time-resolved decryption, and 3D stereoscopic anti-counterfeiting. This work not only elucidates the intrinsic mechanism of multifunctional NNPA but also paves the way for next-generation smart photonic materials.
PMID:
42893673
Bibliographic data and abstract were imported from PubMed on 19 Oct 2026.
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