Intense multiphoton upconversion of Yb3+–Tm3+ doped β-NaYF4 individual nanocrystals by saturation excitation

Jiajia Zhou; Gengxu Chen; Yingbin Zhu; Lili Huo; Wei Mao; Danna Zou; Xinwen Sun; E Wu; Heping Zeng; Junjie Zhang; Long Zhang; Jianrong Qiu; Shiqing Xu

doi:10.1039/C4TC02363C

Intense multiphoton upconversion of Yb³⁺–Tm³⁺ doped β-NaYF₄ individual nanocrystals by saturation excitation†

Jiajia Zhou,^a Gengxu Chen,^b Yingbin Zhu,^c Lili Huo,^a Wei Mao,^a Danna Zou,^a Xinwen Sun,^a E Wu,^b Heping Zeng,^b Junjie Zhang,^a Long Zhang,^d Jianrong Qiu^e and Shiqing Xu*^a

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* Corresponding authors

^a College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, China
E-mail: shiqingxu75@163.com
Fax: +86 57186875607
Tel: +86 57186875607

^b State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

^c Engineering Product Development, Singapore University of Technology and Design, Singapore 138682, Singapore

^d Key Laboratory of Materials for High-Power Laser, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China

^e State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Abstract

Saturation excitation of individual nanocrystals represents a powerful strategy to explore unique optical characteristics of luminescent activators. Here we report the intense multiphoton upconversion of β-NaYF₄: Yb³⁺–Tm³⁺ individual nanocrystals benefiting from the perfect ladder-type electron configuration of Tm³⁺ under saturation illumination excitation. This leads to a luminescence switching between the emissions from 2-photon upconversion and 4-photon upconversion, which exhibits significantly enhanced luminescence intensity by up to a factor of 70. Such intense multiphoton upconversion may have potential application in super-resolution imaging.

Journal of Materials Chemistry C

Intense multiphoton upconversion of Yb³⁺–Tm³⁺ doped β-NaYF₄ individual nanocrystals by saturation excitation†

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Intense multiphoton upconversion of Yb³⁺–Tm³⁺ doped β-NaYF₄ individual nanocrystals by saturation excitation

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Journal of Materials Chemistry C