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6. Dynamic modulation of multicolor upconversion luminescence of Er3+ via excitation pulse width.

Author

Ma, En, Yu, Shiqi, You, Wenwu, Tu, Datao, Wen, Fei, Xing, Yun, Lu, Shan, and Chen, Xueyuan

Subjects
LUMINESCENCE, LASER pulses, SEMICONDUCTOR lasers, PHOTON upconversion, ENERGY transfer
Abstract

Lanthanide-doped upconversion (UC) luminescent materials display multicolor emissions, making them ideal for a variety of applications, such as multi-channel biological imaging, fluorescence encryption, anti-counterfeiting, and 3D display. Manipulating the UC emissions of the luminescent materials with a fixed composition is crucial for their applications. Herein, we propose a facile strategy to achieve pulse-width-dependent multicolor UC emissions in NaYF4:Yb/Er/Tm nanocrystals. Upon excitation with a 980 nm continuous-wave laser diode, Er3+ ions in NaYF4:20%Yb,15%Er,1%Tm nanocrystals exhibited UC emissions with a red-to-green (R/G) ratio of 11.3. Nevertheless, by employing a 980 nm pulse laser with pulse widths from 0.1 to 10 ms, the UC R/G ratio can be easily adjusted from 0.9 to 11.3, resulting in continuous and remarkable color transformation from green, yellow, orange, to red. By virtue of the dynamic luminescence color variation of these NaYF4:20%Yb,15%Er,1%Tm nanocrystals, we demonstrated their potential applications in the areas of anti-counterfeiting and information encryption. These findings provide deep insights into the excited-state dynamics and energy transfer of Er3+ in NaYF4:Yb/Er/Tm nanocrystals upon 980 nm pulse excitation, which may pave the way for designing multicolor UC materials toward versatile applications. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Multi-wavelength compression imaging and 3D reconstruction based on lanthanide transducers

Author

Yu, Shiqi, Tu, Datao, and Chen, Xueyuan

Abstract

Multi-wavelength, multi-channel, and multi-depth imaging techniques are essential in the research of three-dimensional reconstruction and comprehensive information representation of target objects. However, traditional techniques are generally limited by cumbersome combinations of costly and bulky components. In this preview, we highlight an excellent imaging technique named “stochastic photoluminescence and compressed encoding” or SPACE. By combining four randomly arrayed lanthanide transducers as photonic encoders with a compressed sensing reconstruction algorithm, the proposed technology enables efficient ultra-broadband, multi-wavelength compression imaging and information reconstruction.

Published
2024
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