Excitation-Independent Emission of Carbon Quantum Dot Solids

Autor:	Xuan-Dung Mai, Yen Thi Hai Phan, Van-Quang Nguyen
Jazyk:	angličtina
Rok vydání:	2020
Předmět:	Materials of engineering and construction. Mechanics of materials TA401-492
Zdroj:	Advances in Materials Science and Engineering, Vol 2020 (2020)
Druh dokumentu:	article
ISSN:	1687-8434 1687-8442
DOI:	10.1155/2020/9643168
Popis:	Solid assemblies of carbon quantum dots (CQDs) are important for diverse applications including LEDs, solar cells, and photosensors; their optical and electrical properties have not been explored yet. Herein, we used amphiphilic CQDs synthesized from citric acid and thiourea by a solvothermal method to fabricate CQD solid films. Optical properties of CQDs studied by UV-Vis and photoluminescence spectroscopies indicate that CQDs possess three different emission centers at 425 nm, 525 nm, and 625 nm originating from C sp2 states, N-states, and S-states, respectively. In a solid state, π-π stacking quenched the blue emission, while the red emission increased. Importantly, CQD films exhibited excitation independence, which is important to design solid-state lighting applications.
Databáze:	Directory of Open Access Journals
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