An Efficient Synthesis and Photoelectric Properties of Green Carbon Quantum Dots with High Fluorescent Quantum Yield
Autor: | Xuguang Liu, Wei Yingying, Yongzhen Yang, Xie Yanting, Jingxia Zheng, Bingshe Xu, Yong Kang Chen |
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Rok vydání: | 2019 |
Předmět: |
Materials science
Dopant General Chemical Engineering high product yield Analytical chemistry Quantum yield Ethylenediamine Photoelectric effect Color temperature Fluorescence Article high fluorescent quantum yield law.invention lcsh:Chemistry chemistry.chemical_compound white LEDs lcsh:QD1-999 chemistry law Yield (chemistry) General Materials Science green carbon quantum dots Light-emitting diode |
Zdroj: | Nanomaterials Volume 10 Issue 1 Nanomaterials, Vol 10, Iss 1, p 82 (2020) |
ISSN: | 2079-4991 |
Popis: | To greatly improve the production quality and efficiency of carbon quantum dots (CQDs), and provide a new approach for the large-scale production of high-quality CQDs, green carbon quantum dots (g-CQDs) with high product yield (PY) and high fluorescent quantum yield (QY) were synthesized by an efficient one-step solvothermal method with 2,7-dihydroxynaphthalene as the carbon source and ethylenediamine as the nitrogen dopant in this study. The PY and QY of g-CQDs were optimised by adjusting reaction parameters such as an amount of added ethylenediamine, reaction temperature, and reaction duration. The results showed that the maximum PY and QY values of g-CQDs were achieved, which were 70.90% and 62.98%, respectively when the amount of added ethylenediamine, reaction temperature, and reaction duration were 4 mL, 180 ° C, and 12 h, respectively. With the optimised QY value of g-CQDs, white light emitting diodes (white LEDs) were prepared by combining g-CQDs and blue chip. The colour rendering index of white LEDs reached 87, and the correlated colour temperature was 2520 K, which belongs to the warm white light area and is suitable for indoor lighting. These results indicate that g-CQDs have potential and wide application prospects in the field of white LEDs. |
Databáze: | OpenAIRE |
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