Grafting Carbon Dots on Persistent Luminescence Phosphors to Generate Remarkably Improved NIR Afterglow for Microenvironment Fluorescence Detection

Author:

Xiahou Junqing1,Cao Li1,Huang Sai2,Zhang Tao3,Li Ji‐Guang4,Zhu Qi13ORCID

Affiliation:

1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education) School of Materials Science and Engineering Northeastern University Shenyang Liaoning 110819 P. R. China

2. School of Material Science and Engineering University of Jinan Jinan 250022 P. R. China

3. Shenyang National Laboratory for Materials Science Northeastern University Shenyang Liaoning 110819 P. R. China

4. Research Center for Electronic and Optical Materials National Institute for Materials Science Tsukuba Ibaraki 305‐0044 Japan

Abstract

AbstractRecently, combining long afterglow materials with organic fluorescent dyes, particularly carbon dots (CDs) to produce heterojunction and improve its luminescence and persistence properties became an important research direction. However, the precise role of these internal defects in the energy transfer process of CD@inorganic matrix composite fluorescent materials has not been thoroughly discussed. Establishing matching trap level to promote the energy transfer between the trap level and CDs level not only helps to enhance the afterglow performance, but also can explain the heterogeneous structure interaction between organic–inorganic fluorescent materials. Herein, ZLAGC@CDs luminescent composite is successfully synthesized via coating CDs on Zn1‐x(Li/Al)xGa2xO4:0.005Cr3+ (ZLAGC, x = 0–1), which exhibits a unique double emission at ≈430 nm (the defect luminescence of CDs) and 718 nm (the 2E→4A2 transition of Cr3+). After coating, the energy transfer from the defect level of CDs to the excited state of Cr3+ enhanced the NIR emission. The electron transfer between the defect level of CDs and the split deeper trap level of ZLAGC also improved the visible and near‐infrared (NIR) afterglow. The fluorescence and afterglow signals of ZLAGC@CDs are highly sensitive to solution pH under acidic conditions, indicating that the prepared fluorescent composite has potential application in acid microenvironment fluorescence detection.

Funder

Fundamental Research Funds for the Central Universities

National Natural Science Foundation of China

Publisher

Wiley

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