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Intense Visible and Near-Infrared Upconversion Photoluminescence in Colloidal LiYF4:Er3+ Nanocrystals under Excitation at 1490 nm
Open accessAbstract
We report intense upconversion photoluminescence (PL) in colloidal LiYF(4):Er(3+) nanocrystals under excitation with telecom-wavelength at 1490 nm. The intensities of two- and three-photon anti-Stokes upconversion PL bands are higher than or comparable to that of the Stokes emission under excitation with low power density in the range 5-120 W/cm(2). The quantum yield of the upconversion PL was measured to be as high as ∼1.2 ± 0.1%, which is almost 4 times higher than the highest upconversion PL quantum yield reported to date for lanthanide-doped nanocrystals in 100 nm sized hexagonal NaYF(4):Yb(3+)20%, Er(3+)2% using excitation at ∼980 nm. A power dependence study revealed that the intensities of all PL bands have linear dependence on the excitation power density, which was explained by saturation effects in the intermediate energy states.
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Metadata
- Authors
- Chen, G., Ohulchanskyy, T. Y., Kachynski, A., Ågren, H., & Prasad, P. N.
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-05-13
- Volume
- 5
- Issue
- 6
- Pages
- 4981-4986
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2040453464
- Cited by
- 374
- References
- 0
- FWCI
- 18.44
- Type
- journal article
- Language
- en
- Open access
- green
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