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

Recently, 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 trans...

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Bibliographic Details
Published in:Advanced optical materials 2024-06, Vol.12 (16), p.n/a
Main Authors: Xiahou, Junqing, Cao, Li, Huang, Sai, Zhang, Tao, Li, Ji‐Guang, Zhu, Qi
Format: Article
Language:English
Subjects:
acid microenvironment detection
Afterglows
Carbon dots
CDs coating
composite luminescent materials
Defects
Electron transfer
Emission
Energy transfer
Fluorescence
Fluorescent dyes
Heterogeneous structure
Heterojunctions
Luminescence
Near infrared radiation
Phosphors
Trivalent chromium
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Summary:Recently, 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. The ZLAGC@CDs phosphors exhibit double emissions at ≈430 and 718 nm. The CDs→Cr3+ energy transfer enhances the NIR emission. The interaction between CDs and electron traps improves visible/NIR afterglow. The phosphors are fluorescence sensors for acid microenvironment detection.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202303175