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Open AccessArticle

Facile Preparation of Stable Solid-State Carbon Quantum Dots with Multi-Peak Emission

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
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(2), 303; https://doi.org/10.3390/nano10020303
Received: 18 January 2020 / Revised: 3 February 2020 / Accepted: 6 February 2020 / Published: 10 February 2020
Aggregation-caused quenching (ACQ) effect, known as the main cause to restrain solid-state luminescence of carbon quantum dots (CQDs), hinders further application of CQDs in white light-emitting diodes (WLED). Here, a complex of CQDs and phthalimide crystals (CQDs/PC) was prepared through a one-step solvothermal method. CQDs/PC prevented CQDs from touching directly by embedding the CQDs in phthalimide crystal matrix in situ, which effectively reduced the ACQ effect. Furthermore, CQDs/PC exhibited multi-peak fluorescence spectra that span the green, yellow and orange spectral regions. Finally, a WLED fabricated based on CQDs/PC achieved a color-rendering index of 82 and a correlated color temperature of 5430 K. This work provides a quick and effective strategy to apply CQDs to WLED.
Keywords: solid-state luminescence; multi-peak emission; yellow carbon quantum dots; white light-emitting diode solid-state luminescence; multi-peak emission; yellow carbon quantum dots; white light-emitting diode
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MDPI and ACS Style

Zheng, Y.; Zheng, J.; Wang, J.; Yang, Y.; Lu, T.; Liu, X. Facile Preparation of Stable Solid-State Carbon Quantum Dots with Multi-Peak Emission. Nanomaterials 2020, 10, 303.

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