Improving upconversion luminescence efficiency in Er3+-doped NaYF4 nanocrystals by two-color laser field
| Autor: | Cheng Xu, Jianrong Qiu, Jingxin Ding, Chengshuai Yang, Pei Liu, Zhenrong Sun, Yunhua Yao, Ye Zheng, Tianqing Jia, Shian Zhang |
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| Rok vydání: | 2016 |
| Předmět: |
education.field_of_study
Materials science business.industry Mechanical Engineering Population Doping 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Laser 01 natural sciences 0104 chemical sciences law.invention Mechanics of Materials law Photovoltaics Optoelectronics General Materials Science Photonics 0210 nano-technology Biological imaging business education Luminescence Excitation |
| Zdroj: | Journal of Materials Science. 51:5460-5468 |
| ISSN: | 1573-4803 0022-2461 |
| Popis: | Improving upconversion luminescence efficiency of lanthanide-doped nanocrystals is always a hot topic for scientists because of its very important application in photonics, photovoltaics, biological imaging, security printing, and therapeutics. Two-color laser field has shown to be a well-established strategy to further improve the upconversion luminescence efficiency. Here, we first propose a two-color laser field combining the 850 and 980 nm lasers to improve the green and red upconversion luminescence efficiency in Er3+-doped NaYF4 nanocrystals. In this work, an important advantage for our strategy is that the population is directly pumped to the radiation energy level of the upconversion luminescence by a cooperation excitation process, but not the spontaneous decay from other higher energy levels, and so the higher luminescence enhancement efficiency can be obtained. These studies also provide a clear physical picture for the physical control mechanism of the upconversion luminescence efficiency improvement, which can pave a way to properly design the laser fields in the future study of upconversion luminescence generation and control. |
| Databáze: | OpenAIRE |
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