Microwave-Assisted Preparation of White Fluorescent Graphene Quantum Dots as a Novel Phosphor for Enhanced White-Light-Emitting Diodes
| Autor: | Lianhui Wang, Zou Min, Zhimin Luo, Wei Huang, Lihui Yuwen, Xinwen Zhang, Guangqin Qi, Ke-Yu Chen |
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| Rok vydání: | 2016 |
| Předmět: |
Materials science
business.industry Graphene Doping Nanotechnology Phosphor 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Fluorescence 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Biomaterials Quantum dot law Electrochemistry Optoelectronics Quantum efficiency Graphite 0210 nano-technology business Diode |
| Zdroj: | Advanced Functional Materials. 26:2739-2744 |
| ISSN: | 1616-301X |
| DOI: | 10.1002/adfm.201505044 |
| Popis: | Graphene quantum dots (GQDs) with white fluorescence are synthesized by a microwave-assisted hydrothermal method using graphite as the precursor. A solution-processed white-light-emitting diode (WLED) is fabricated using the as-prepared white fluorescent GQDs (white-light-emitting graphene quantum dots, WGQDs) doped 4,4-bis(carbazol-9-yl)biphenyl as the emissive layer. White-light emission is obtained from the WLED with 10 wt% doping concentration of WGQDs, which shows a luminance of 200 cd m−2 at the applied voltage of 11–14 V. Importantly, an external quantum efficiency of 0.2% is achieved, which is the highest among all the reported WLED based on GQDs or carbon dots. The results demonstrate that WGQDs as a novel phosphor may open up a new avenue to develop the environmentally friendly WLEDs for practical application in solid-state lighting. |
| Databáze: | OpenAIRE |
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