Efficient room temperature afterglow in nitrogen doped carbon dots triggered by steric hindrance effect

IF 3.3 3区物理与天体物理 Q2 OPTICS

Journal of Luminescence Pub Date : 2025-01-22 DOI:10.1016/j.jlumin.2025.121100

Jing Yang, Yafang Wang, Xiaona Lu

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Abstract

Carbon dots (CDs) have attracted considerable attention in the construction of metal free afterglow materials. Most of the precursor materials used for the preparation of CDs are hazardous chemicals and the afterglow decay time is very short. The current improvements were made by modifying the reaction time and embedding dopants. Two series of boronic acid-based carbon dots (CDs/BA) and N-doped boronic acid-based carbon dots (NCDs/BA) have been successfully prepared. The luminescence results indicate that the boronic acid caused boron carbon (B-C) bond can reduce the energy gap (Δ E_ST) between the lowest singlet state (S₁) and triplet state (T₁), which leads to the promotion of intersystem crossing (ISC) between S₁ and T₁ and the increase of the number of triplet excitons. Additionally, morphological characterization as well as the luminescence performance of NCDs/BA indicate that the steric hindrance effect has another effect on the activating of room temperature phosphorescent (RTP) of boronic acid-based CDs, which could increase the skeleton stiffness of CDs and effectively protect the excited triplet state of CDs from non-radiative deactivation.

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来源期刊

Journal of Luminescence 物理-光学

CiteScore

6.70

自引率

13.90%

发文量

850

审稿时长

3.8 months

期刊介绍： The purpose of the Journal of Luminescence is to provide a means of communication between scientists in different disciplines who share a common interest in the electronic excited states of molecular, ionic and covalent systems, whether crystalline, amorphous, or liquid. We invite original papers and reviews on such subjects as: exciton and polariton dynamics, dynamics of localized excited states, energy and charge transport in ordered and disordered systems, radiative and non-radiative recombination, relaxation processes, vibronic interactions in electronic excited states, photochemistry in condensed systems, excited state resonance, double resonance, spin dynamics, selective excitation spectroscopy, hole burning, coherent processes in excited states, (e.g. coherent optical transients, photon echoes, transient gratings), multiphoton processes, optical bistability, photochromism, and new techniques for the study of excited states. This list is not intended to be exhaustive. Papers in the traditional areas of optical spectroscopy (absorption, MCD, luminescence, Raman scattering) are welcome. Papers on applications (phosphors, scintillators, electro- and cathodo-luminescence, radiography, bioimaging, solar energy, energy conversion, etc.) are also welcome if they present results of scientific, rather than only technological interest. However, papers containing purely theoretical results, not related to phenomena in the excited states, as well as papers using luminescence spectroscopy to perform routine analytical chemistry or biochemistry procedures, are outside the scope of the journal. Some exceptions will be possible at the discretion of the editors.