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Stokes and anti-Stokes luminescence in Tm3+/Yb3+-doped Lu3Ga5O12 nano-garnets: a study of multipolar interactions and energy transfer dynamics
Nanocrystalline Lu 3 Ga 5 O 12 garnets doped with Tm 3+ /Yb 3+ ions have been synthesized by a low cost and environmentally benign sol-gel technique and characterized for their structural, Stokes and anti-Stokes luminescence properties. The diffuse reflectance spectra of doped Lu 3 Ga 5 O 12 nano-ga...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
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| Summary: | Nanocrystalline Lu
3
Ga
5
O
12
garnets doped with Tm
3+
/Yb
3+
ions have been synthesized by a low cost and environmentally benign sol-gel technique and characterized for their structural, Stokes and anti-Stokes luminescence properties. The diffuse reflectance spectra of doped Lu
3
Ga
5
O
12
nano-garnets have been measured to derive the partial energy level structure of Tm
3+
and Yb
3+
ions and possible energy transfer channels between them. Upon laser excitation at 473 nm, weak red and intense near-infrared Stokes emissions have been observed in the nano-garnets. The decay curves of
3
H
4
and
1
G
4
levels of Tm
3+
ions and the
2
F
5/2
level of Yb
3+
ions have been measured upon resonant laser excitation and are found to be non-exponential in nature due to multipolar interactions. In order to know the kind of multipolar interaction among optically active ions, the decay curves are analyzed through the generalized Yokota-Tanimoto model. Moreover, under 970 nm laser excitation, intense blue anti-Stokes emission is observed by the naked eye in Tm
3+
-Yb
3+
co-doped Lu
3
Ga
5
O
12
nano-garnets. The results show that as-synthesized nano-garnets may be useful in the field of phosphors and photonics.
Nanocrystalline Lu
3
Ga
5
O
12
garnets doped with Tm
3+
/Yb
3+
ions have been synthesized and characterized for their structural, Stokes and anti-Stokes luminescence properties. Multipolar interactions among active ions, energy transfer and diffusion parameters have been estimated in the nano-garnets. |
|---|---|
| ISSN: | 1463-9076 1463-9084 |
| DOI: | 10.1039/c6cp01639a |