Deep red upconversion photoluminescence in Er3+‐doped Yb3Ga5O12 nanocrystalline garnet

The nanocrystalline single‐phase Er3+‐doped Yb3Ga5O12 garnets have been prepared by the sol‐gel combustion technique with a crystallite size of ≈30 nm. The presence of Yb3+ in garnet hosts allows their efficient excitation at the ≈977 nm wavelength. The Er3+ doping of Yb3Ga5O12 garnet host results i...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2022-05, Vol.105 (5), p.3391-3402
Main Authors: Netolicky, Tomas, Strizik, Lukas, Benes, Ludvik, Melanova, Klara, Slang, Stanislav, Wagner, Tomas
Format: Article
Language:English
Subjects:
combustion synthesis
Crystallites
Emission spectra
Energy transfer
Erbium
erbium/erbium compounds
Garnets
Nanocrystals
Phosphors
Photoluminescence
Sol-gel processes
Upconversion
Ytterbium
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Summary:The nanocrystalline single‐phase Er3+‐doped Yb3Ga5O12 garnets have been prepared by the sol‐gel combustion technique with a crystallite size of ≈30 nm. The presence of Yb3+ in garnet hosts allows their efficient excitation at the ≈977 nm wavelength. The Er3+ doping of Yb3Ga5O12 garnet host results in deep red Er3+: 4F9/2 → 4I15/2 upconversion photoluminescence (UCPL) emission. The dominance of the red UCPL emission over the green Er3+: 4F7/2/2H11/2/4S3/2 → 4I15/2 component was investigated using the measurement of the steady‐state and time‐dependent Er3+ and Yb3+ emission spectra in combination with the power‐dependent UCPL emission intensity. The proposed upconversion mechanism is discussed in terms of the Er3+ → Yb3+ energy back transfer process as well as Yb3+(Er3+) → Er3+ energy transfer and Er3+ ↔ Er3+ cross‐relaxation processes. The studied Er3+‐doped Yb3Ga5O12 garnet may be utilized as a red upconversion emitting phosphor.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18313