Solid-state red emissive carbon dots based on high boiling point solvents for white light-emitting diodes
Summary: A simple and rapid one-step microwave-assisted method was employed to synthesize solid-state red emissive carbon dots (R-CDs) using phloroglucinol, urea, and ammonium fluoride in a high-boiling point solvent. Raw material ratios and solvent types were investigated. The optimal emission of R...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-04-01
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| Series: | iScience |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2589004225005115 |
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| Summary: | Summary: A simple and rapid one-step microwave-assisted method was employed to synthesize solid-state red emissive carbon dots (R-CDs) using phloroglucinol, urea, and ammonium fluoride in a high-boiling point solvent. Raw material ratios and solvent types were investigated. The optimal emission of R-CDs at 625 nm was achieved when the molar ratio was 3:1:6 in a 50% N, N-dimethyl formamide/water for 15 min. When formamide and water (v/v = 5:95) were used, R-CDs with longer emission (640 nm) were obtained and the reaction time was shortened to 3 min, enhancing both efficiency and cost-effectiveness. Both R-CDs maintained >96% fluorescence intensity after UV exposure and <5% weight loss at 200°C. Combined with polyvinyl pyrrolidone, R-CDs baesed red LEDs with CIE coordinates (0.67, 0.33) and (0.62, 0.38) were achieved. Combined with blue/green CDs, white LEDs showed color rendering indexes of 91–92. This study advances solid-state red CDs for high-quality white LEDs. |
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| ISSN: | 2589-0042 |