TY  - JOUR
AU  - Rathaiah, M.
AU  - Haritha, P.
AU  - Lozano-Gorrín, A.D.
AU  - Babu, P.
AU  - Jayasankar, C.K.
AU  - Rodríguez-Mendoza, U.R.
AU  - Lavín, V.
AU  - Venkatramu, V.
T1  - Stokes and anti-Stokes luminescence in Tm3+/Yb3+-doped Lu3Ga5O12 nano-garnets: A study of multipolar interactions and energy transfer dynamics
LA  - eng
PY  - 2016
SP  - 14720
EP  - 14729
T2  - Physical Chemistry Chemical Physics
SN  - 1463-9076
VL  - 18
IS  - 21
PB  - Royal Society of Chemistry
AB  - Nanocrystalline Lu3Ga5O12 garnets doped with Tm3+/Yb3+ 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 Lu3Ga5O12 nano-garnets have been measured to derive the partial energy level structure of Tm3+ and Yb3+ 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 3H4 and 1G4 levels of Tm3+ ions and the 2F5/2 level of Yb3+ 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 Tm3+-Yb3+ co-doped Lu3Ga5O12 nano-garnets. The results show that as-synthesized nano-garnets may be useful in the field of phosphors and photonics.
DO  - 10.1039/C6CP01639A
UR  - https://portalciencia.ull.es/documentos/5e3c3c6129995246bbf60768
DP  - Dialnet - Portal de la Investigación
ER  -