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Chen R, Wang Z, Teng Q, Li C, Li J, Zeng L, Zhang R, Huang F, Lei L, Yuan F, Chen D. Binary Host-induced Exciplex Enabled High Color-Rendering Index of 94 for Carbon Quantum Dot-Based White Light-Emitting Diodes. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2404485. [PMID: 38872266 DOI: 10.1002/advs.202404485] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2024] [Revised: 05/25/2024] [Indexed: 06/15/2024]
Abstract
White light-emitting diodes (WLEDs) with high color-rendering index (CRI, >90) are important for backlight displays and solid-state lighting applications. Although the well-developed colloidal quantum dots (QDs) based on heavy metals such as cadmium and lead are promising candidates for WLEDs, the low CRI still remains a significant limitation. In addition, the severe toxicity of heavy metals greatly limits their widespread use. Herein, the study demonstrates low-cost and environmentally friendly carbon quantum dots (CQDs)-based WLEDs that exhibit a high CRI of 94.33, surpassing that of conventional cadmium/lead-containing QD-based WLEDs. This achievement is attained through the employment of a binary host-induced exciplex strategy. The high hole/electron mobility and suitable energy levels of the donor and acceptor give rise to a broadband orange-yellow emission stemming from the exciplex. As the host, the binary exciplex is capable of contributing blue and orange-yellow emission components while efficiently mitigating the aggregation-induced quenching of CQDs. Meanwhile, CQDs effectively address the deep-red emission gap, enabling the realization of CQDs-based WLEDs with high CRI. These WLEDs also exhibit a remarkably low turn-on voltage of 2.8 V, a maximum luminance exceeding 2000 cd m- 2, a correlated color temperature of 4976 K, and Commission Internationale de l'Eclairage coordinates of (0.34, 0.32).
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Affiliation(s)
- Renjing Chen
- College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, 350117, P. R. China
| | - Zhibin Wang
- College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, 350117, P. R. China
| | - Qian Teng
- Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Chenhao Li
- Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Jinsui Li
- Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Lingwei Zeng
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201, P. R. China
| | - Ruidan Zhang
- College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, 350117, P. R. China
| | - Feng Huang
- College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, 350117, P. R. China
| | - Lei Lei
- Institute of Optoelectronic Materials and Devices, China Jiliang University, Hangzhou, 310018, P. R. China
| | - Fanglong Yuan
- Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, College of Chemistry, Beijing Normal University, Beijing, 100875, P. R. China
| | - Daqin Chen
- College of Physics and Energy, Fujian Normal University, Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials, Fuzhou, 350117, P. R. China
- Fujian Provincial Collaborative Innovation Center for Advanced High-Field Superconducting Materials and Engineering, Fuzhou, 350117, P. R. China
- Fujian Provincial Engineering Technology Research Center of Solar Energy Conversion and Energy Storage, Fuzhou, 350117, P. R. China
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Chelly M, Chelly S, Ferlazzo A, Neri G, Bouaziz-Ketata H. Lavandula multifida as a novel eco-friendly fluorescent-blue material for mercury ions sensing in seawater at femto-molar concentration. CHEMOSPHERE 2024; 352:141409. [PMID: 38346515 DOI: 10.1016/j.chemosphere.2024.141409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2023] [Revised: 01/30/2024] [Accepted: 02/06/2024] [Indexed: 02/19/2024]
Abstract
In this paper, we present a novel fluorescent material based on the herbal tea of Lavandula multifida (Lm). The fluorescence properties of Lm aqueous extract were analyzed under various excitation wavelengths in the range of 290-450 nm. The Lm herbal infusion was found to be highly fluorescent, with an emission maximum at 450 nm under excitation at 390 nm. Consequently, it was exploited to develop a fluorescence method for detecting metal ions. Results obtained upon the addition of Hg2+, Na+, K+, Ca2+, Mg2+, Pb2+, Cd2+, Cu2+, Ni2+, Bi3+, Mn2+, Fe3+ and Co2+ ions showed that the fluorescence intensity of the Lm aqueous extract decreased strongly with the presence of mercury ions. A solid-state fluorescent sensor, based on Lm embedded into a Nafion membrane and deposited on a transparent polyethylene terephthalate (PET) sheet, has also been developed for the effective detection of Hg2+ ions. The Lm-Nafion-PET sensor exhibited good stability, high repeatability, and reproducibility. Furthermore, the Lm-Nafion/PET sensor demonstrated remarkable sensitivity to Hg2+ in sea water, with a limit of detection of 0.25 fM. To our knowledge, this is the first study which reports Lavandula multifida plant for making a novel eco-friendly fluorescent solid-state sensor for the detection of mercury ions at femto-molar concentrations in seawater.
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Affiliation(s)
- Meryam Chelly
- Department of Engineering, University of Messina, C.da Di Dio, I-98166, Messina, Italy; Laboratory of Toxicology-Microbiology Environmental and Health, LR17ES06, Sfax, Tunisia
| | - Sabrine Chelly
- Department of Engineering, University of Messina, C.da Di Dio, I-98166, Messina, Italy; Laboratory of Toxicology-Microbiology Environmental and Health, LR17ES06, Sfax, Tunisia
| | - Angelo Ferlazzo
- Department of Engineering, University of Messina, C.da Di Dio, I-98166, Messina, Italy; Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125, Catania, Italy
| | - Giovanni Neri
- Department of Engineering, University of Messina, C.da Di Dio, I-98166, Messina, Italy.
| | - Hanen Bouaziz-Ketata
- Laboratory of Toxicology-Microbiology Environmental and Health, LR17ES06, Sfax, Tunisia.
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Ge M, Liu S, Li J, Li M, Li S, James TD, Chen Z. Luminescent materials derived from biomass resources. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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