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Open AccessArticle

An Efficient Synthesis and Photoelectric Properties of Green Carbon Quantum Dots with High Fluorescent Quantum Yield

1
Key Laboratory of Interface Science and Engineering in Advanced Materials, Taiyuan University of Technology, Ministry of Education, Taiyuan 030024, China
2
Institute for New Carbon Materials, Taiyuan University of Technology, Taiyuan 030024, China
3
School of Engineering and Computer Science, University of Hertfordshire, Hatfield post code, Hertfordshire AL10 9AB, UK
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 82; https://doi.org/10.3390/nano10010082
Received: 27 November 2019 / Revised: 25 December 2019 / Accepted: 28 December 2019 / Published: 1 January 2020
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.
Keywords: high product yield; green carbon quantum dots; high fluorescent quantum yield; white LEDs high product yield; green carbon quantum dots; high fluorescent quantum yield; white LEDs
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MDPI and ACS Style

Zheng, J.; Xie, Y.; Wei, Y.; Yang, Y.; Liu, X.; Chen, Y.; Xu, B. An Efficient Synthesis and Photoelectric Properties of Green Carbon Quantum Dots with High Fluorescent Quantum Yield. Nanomaterials 2020, 10, 82.

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