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Engineering Orthogonal Upconversion through Selective Excitation in a Single Nanoparticle

机译：Engineering Orthogonal Upconversion through Selective Excitation in a Single Nanoparticle

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摘要

Orthogonal upconversion with color-switchable emissions under differentexcitation conditions provides new chances to diverse frontier applicationsof luminescent materials. However, the previous orthogonal upconversionsystems compulsorily require the precise control of spatial distributions ofdopants and host compositions to avoid spectral cross-talk, greatly limitingtheir synthesis and application. Herein, a conceptual design is presented torealize the orthogonal upconversion by selectively activating sensitizers andactivators in nanostructure. In detail, the 915 nm laser, instead of the mostlyused 980 nm, is adopted to activate the sensitizer Yb~(3+) because of the broad~2F_(5/2)←~2F_(7/2) absorption band; while it is non-responsive to Er~(3+), consequentlyavoiding the spectral cross-talk due to the simultaneous activation of bothEr~(3+) and Yb~(3+) under 980 nm irradiation as shown in the previous works.Such a selective excitation strategy is able to realize the red/green, blue/red,and blue/green orthogonal upconversion in a single nanoparticle by simplyaltering the excitation wavelength from 915 to 1530 nm. More interestingly,it further allows for full-color output by temporal control of the upconversiondynamics. The findings suggest a facile but effective approach to the designof smart luminescent materials, showing great potential in multi-level anticounterfeiting,information security and biological applications.

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