Aromatic ring compounds with different conjugation degrees in a boronic acid matrix to realize multicolor phosphorescence for time division colorful multiplexing

Abstract

Long lifetime multicolor phosphorescence materials possess excellent optical properties and have important application prospects in the fields of advanced anti-counterfeiting and information encryption. However, realizing long lifetime and color-tunable room temperature phosphorescent (RTP) carbon dot (CD) materials has proved challenging. In this study, the organic precursor molecules 2-phenethylamine (2-Ph), 9-aminophenanthrene (9-Ph) and 1-aminopyrene (1-Py) with different degrees of conjugation were selected to synthesize RTP CD composites: 2-Ph@BA, 9-Ph@BA and 1-Py@BA were synthesized by mixing with a boric acid (BA) matrix under high temperature pyrolysis. During high temperature pyrolysis, CDs form effective covalent and hydrogen bonds with the BA matrix to promote RTP activity and obtain a stable triplet state, which suppresses nonradiative transitions and leads to long lifetime RTP. Besides, as the conjugation of the organic precursor molecules 2-Ph, 9-Ph and 1-Py gradually increases, it results in a gradual decrease of the triplet state energy T1. Thus, 2-Ph@BA, 9-Ph@BA and 1-Py@BA RTP emission showed a significant redshift, leading to green, yellow and red phosphorescence colors, respectively. Finally, RTP CD composites are used in information security and time division colorful multiplexing based on the synthesized samples with different phosphorescence colors and lifetimes.

Graphical abstract: Aromatic ring compounds with different conjugation degrees in a boronic acid matrix to realize multicolor phosphorescence for time division colorful multiplexing

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Article information

Article type
Paper
Submitted
09 Dec 2024
Accepted
20 Jan 2025
First published
21 Jan 2025

Nanoscale, 2025, Advance Article

Aromatic ring compounds with different conjugation degrees in a boronic acid matrix to realize multicolor phosphorescence for time division colorful multiplexing

Q. Yao, Z. Wang, N. V. Gaponenko, J. Shi, Z. Da, C. Zhang, J. Wang, W. Wan and M. Wang, Nanoscale, 2025, Advance Article , DOI: 10.1039/D4NR05190D

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