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Solid-State Carbon Dots with Red Fluorescence and Efficient Construction of Dual-Fluorescence Morphologies
Jiangling He1, Youling He1, Yonghao Chen1
1Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China.
Small (Weinheim an Der Bergstrasse, Germany)
|May 18, 2017
Summary
Organosilane-functionalized carbon dots (CDs) now offer stable solid-state red fluorescence, overcoming self-quenching. A new method creates dual-fluorescence materials from these CDs for applications like white LEDs and oxygen sensing.
Area of Science:
- Materials Science
- Nanotechnology
- Photochemistry
Background:
- Carbon dots (CDs) are nanomaterials with unique optical properties.
- Achieving stable solid-state luminescence from CDs, especially overcoming self-quenching, remains a challenge.
- Developing novel methods for creating functional luminescent materials is crucial for advanced applications.
Purpose of the Study:
- To report the first stable solid-state red fluorescence from organosilane-functionalized carbon dots (CDs).
- To introduce a novel method for constructing dual-fluorescence morphologies using these CDs.
- To investigate the photoluminescence properties and potential applications of these engineered materials.
Main Methods:
- Synthesis of organosilane-functionalized carbon dots (approx. 3 nm).
- Characterization of photoluminescence properties (quantum yield, fluorescence lifetime) in solid-state and aqueous solutions.
- Construction of dual-fluorescence composites by combining CDs with non-fluorescent matrices (starch, Al2O3, RnOCH3COONa).
- Tuning photoluminescence by adjusting the mass ratio of CDs to the solid matrix.
Main Results:
- Stable solid-state red fluorescence was achieved from organosilane-functionalized CDs.
- A novel method for creating dual-fluorescence morphologies was successfully developed.
- Quantum yields were 9.60% (solid-state) and 50.7% (aqueous).
- Fluorescence lifetimes were 4.82 ns (solid-state) and 15.57 ns (aqueous).
- Dual-fluorescence materials exhibited characteristic peaks near 440 nm and 600 nm.
- Tunable photoluminescence was demonstrated in CDs/starch composites.
- Composites showed potential for white light-emitting diodes and oxygen sensing.
Conclusions:
- Organosilane-functionalized carbon dots provide a viable route to stable solid-state red fluorescence.
- The developed method enables the creation of novel dual-fluorescence materials with tunable properties.
- These engineered carbon dot composites hold promise for applications in lighting and sensing technologies.
