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Blue and red upconversion color tuning of Tm3+ via pulse excitation based on the thermal effect

Yin Zhu, Li Xu, Boyang Li, Yifu Wang, Dongyu Li, Jing Ren, Haili Jiang, Lu Liu, Fuqiang Jiang, and Jianzhong Zhang

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Abstract

Color-tunable upconversion luminescence has wide prospects for anti-counterfeiting and disease diagnosis/treatment. To date, achieving high-quality tunable red and blue emissions using a single excitation wavelength remains a formidable challenge, due to the large energy difference between the red and blue photons. In this Letter, based on Tm3+ upconversion luminescence, blue dominant and red dominant emissions are generated upon 980-nm excitations using a short and long pulse, respectively. The corresponding color tuning mechanisms are investigated based on the spectral observations. The proposed color tuning strategy is particularly useful for in vivo applications as the red and blue lights play important roles in biological imaging and drug release, respectively.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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