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Multicolor Tunable Upconversion Luminescence Via Near‐Infrared Manipulation of Population Pathways of Er3+ Ions Excited‐State Levels for Volumetric Color Displays

ADVANCED OPTICAL MATERIALS(2024)

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摘要
Precise control over multicolor luminescence of upconversion nanoparticles (UCNPs) is of significant importance for their applications in widespread fields of research. However, realizing the tunable emissions in single UCNPs with a single lanthanide element remains a great challenge. Herein, without multiple lanthanide elements, a new strategy for the regulation of the excited-state level population pathways of the same lanthanide activator Er3+ ion to obtain multicolor-tunable upconversion luminescence is proposed through utilizing 980 nm coupled 1973 nm synergistic excitation. Unlike typical single wavelength excitation, the synergistic excitation may affect population pathways of the excited-state level of Er3+ ion by adjusting excitation wavelength and power density, resulting in a dynamically adjustable change in luminescence color output. Notably, multicolor luminescence involving green, chartreuse, yellow, orange, and red can be tuned dynamically in the NaYF4:Er3+ single UCNPs by using the tunable 980/1973 nm synergistic excitation. This dynamic luminescence color variation from these UCNPs has demonstrated promising potential applications in volumetric color display. The results provide a new approach to achieve multicolor-tunable upconversion luminescence at single nanoparticles level and open up the possibility of developing true three-dimensional volumetric color display technologies with resolution at the nanometer range.
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关键词
dynamic luminescence color variation,excited-state level population pathways,single lanthanide element,synergistic excitation,volumetric color display
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