期刊
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
卷 250, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2020.119340
关键词
Carbon dots; Solid-state fluorescence; White light-emitting diodes; Microwave-assisted synthesis method
类别
资金
- Doctoral Scientific Research Foundation of Xinxiang Medical University [XYBSKYZZ201716]
- Key Scientific Research Project of Colleges and Universities in Henan Province [20A150034]
- Key Technologies R&D Program of Henan Province [202102310347, 172102310034, 182102311130]
Novel carbon dots with bright solid-state fluorescence were synthesized by a simple microwave-assisted method, showing the ability to overcome aggregation-induced fluorescence quenching and being suitable for the fabrication of WLEDs.
Fluorescence quenching of carbon dots (CDs) occurs in their aggregated state ascribed to direct pi-pi interactions or excessive resonance energy transfer (RET). Thus, CDs have been severely restricted for applications requiring phosphors that emit in the solid state, such as the fabrication of white light-emitting diodes (WLEDs). In this report, novel CDs with bright solid-state fluorescence (SSF) were synthesized by simple microwave-assisted synthesis method, using 1,4,7,10-tetraazacyclododecane (cyclen) and citric acid as precursors. Under 365 nm UV light, these CDs emit bright yellow SSF, indicating they successfully overcome the aggregation-induced fluorescence quenching (ACQ) effect. When the excitation wavelength (lambda(ex)) is fixed at 450 nm, the emission peak of the CDs is centered at 546 nm with the Commission Internationale de l'Eclairage chromaticity (CIE) coordinates of (0.43, 0.55), which means that they can be combined with a blue-emitting chip in order to fabricate WLEDs. More importantly, the absolute quantum yield (QY) of these CDs powder reached 48% at lambda(ex) of 450 nm, which was much higher than many previously reported SSF-emitting CDs and indicating their high light conversion ability in solidstate. Thanks to the excellent optical property of these CDs powder, they were successfully used in the preparation of high-performance WLEDs. This study not only enriches SSF-emitting CD-based nanomaterials with good prospects for application, but also provides valuable reference for subsequent research on the synthesis of solid-state fluorescent CDs. (C) 2020 Published by Elsevier B.V.
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