期刊
ACS NANO
卷 7, 期 12, 页码 11234-11241出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn405017q
关键词
carbon dots; color switchable; voltage-dependent; light emitting diode; current density
类别
资金
- National Science Fund for Distinguished Young Scholars [61225018]
- National 863 Program [2011AA050509]
- National Natural Science Foundation of China [61106039, 51272084]
- National Postdoctoral Foundation [2011049015]
- Hong Kong Scholar Program [XJ2012022]
- Shandong Natural Science Foundation [ZR2012FZ007]
- Jilin Talent Fund
- Jilin Province Youth Foundation [201101025]
- State Key Laboratory on Integrated Optoelectronics (Jilin University) [IOSKL2012ZZ12]
- Research Grant Council of Hong Kong S.A.R. [T23-713/11]
Carbon-dot based light-emitting diodes (LEDs) with driving current controlled color change are reported. These devices consist of a carbon-dot emissive layer sandwiched between an organic hole transport layer and an organic or inorganic electron transport layer fabricated by a solution-based process. By tuning the device structure and the injecting current density (by changing the applied voltage), we can obtain multicolor emission of blue, cyan, magenta, and white from the same carbon dots. Such a switchable EL behavior with white emission has not been observed thus far in single emitting layer structured nanomaterial LEDs. This interesting current density-dependent emission is useful for the development of colorful LEDs. The pure blue and white emissions are obtained by tuning the electron transport layer materials and the thickness of electrode.
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