期刊
JOURNAL OF MATERIALS SCIENCE
卷 54, 期 11, 页码 8492-8503出版社
SPRINGER
DOI: 10.1007/s10853-019-03497-6
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资金
- National Natural Science Foundation of China [11504060, 51701201]
- Natural Science Foundation of Guangxi Zhuang Autonomous Region [2018GXNSFBA281163]
- Scientific Research Project for Higher Education of Guangxi Zhuang Autonomous Region [KY2015ZD006]
- Doctoral Scientific Research Foundation of Guangxi University [XBZ160084]
- Young Teachers' Innovation Training Project of Guangxi Bossco Environmental Protection Technology Co., Ltd. [BRP180220]
Low-voltage and multicolor electroluminescent light-emitting diodes (LEDs) based upon carbon dots (CDs) are demonstrated by using simple all-inorganic CDs/Si heterostructures. Electroluminescence (EL) originations of the CDs/Si LEDs are investigated clearly without the interference of commonly used organic semiconductors. Three distinct peaks at 438, 540, and 600nm are achieved in the EL spectra of the CDs/Si LEDs, and they are found to only originate from the CDs. Addition of a PMMA polymer does not influence the EL originations, but improves the flatness of the CD active layer, thereby enhancing the EL performance of the CDs/Si LEDs. Most strikingly, the emission threshold voltage of such all-inorganic CDs/Si LEDs is as low as 3.4V, which is the lowest onset voltage among the CDs-based LEDs by using fluorescent CDs as the active emitter. The ultra-low driving voltage proves the feasibility of the all-inorganic CDs/Si LEDs in the future multicolor solid-state lighting applications.
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