https://scholars.lib.ntu.edu.tw/handle/123456789/407357
標題: | Enhanced upconversion of NaYF4:Er3+/Yb3+ phosphors prepared via the rapid microwaveassisted hydrothermal route at low temperature: Phase and morphology control | 作者: | Som S. Das S. Yang C.-Y. Lu C.-H. |
公開日期: | 2016 | 卷: | 41 | 期: | 3 | 起(迄)頁: | 464-467 | 來源出版物: | Optics Letters | 摘要: | Monophasic NaYF4:Er3+/Yb3+ crystals were synthesized via the microwave-assisted hydrothermal route at 180¢XC. Microwave heating during the hydrothermal process substantially reduces the duration of reaction for the formation of cubic-NaYF4:Er3+/Yb3+ nanocrystals from 6 h to 30 min. As the duration of the reaction increases, cubic-NaYF4:Er3+/Yb3+ nanocrystals are transformed to uniform hexagonal-NaYF4:Er3+/Yb3+ microprisms because of the enhanced reaction kinetics. Bright upconverted emission from the NaYF4:Er3+/Yb3+ crystal, obtained by the efficient two-photon excitation, is related to crystal structure and morphology. The hexagonal microprisms exhibit better upconversion and are employed in security applications. ? 2016 Optical Society of America. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/407357 | ISSN: | 01469592 | DOI: | 10.1364/OL.41.000464 |
顯示於: | 化學工程學系 |
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