Titolo:  Luminescence enhancement by energy transfer in melamine-Y2O3:Tb3+ nanohybrids
Data di pubblicazione:  2015
Autori: 
Autori:  Stagi, Luigi; Chiriu, Daniele; Ardu, Andrea; Cannas, Carla; Carbonaro, Carlo M.; Ricci, Pier Carlo
Numero degli autori:  6
Lingua:  Inglese
Presenza coautori internazionali:  no
Rivista:  JOURNAL OF APPLIED PHYSICS
Volume:  118
Fascicolo:  12
Pagina iniziale:  125502
Numero di pagine:  9
Digital Object Identifier (DOI):  http://dx.doi.org/10.1063/1.4931678
Codice identificativo Scopus:  2-s2.0-84942549118
Codice identificativo ISI:  WOS:000362565800070
Abstract:  The phenomenon of luminescence enhancement was studied in melamine-Y2O3:Tb hybrids. Terbium doped Y2O3 mesoporous nanowires were synthesized by hydrothermal method. X-ray diffraction patterns and Raman scattering spectra testified the realization of a cubic crystal phase. Organic-inorganic melamine-Y2O3:Tb3+ hybrid system was successfully obtained by vapour deposition method. Vibration Raman active modes of the organic counterpart were investigated in order to verify the achievement of hybrid system. Photoluminescence excitation and photoluminescence spectra, preformed in the region between 250 and 350 nm, suggest a strong interaction among melamine and Terbium ions. In particular, a remarkable improvement of 5D4→ FJ Rare Earth emission (at about 542 nm) of about 102 fold was observed and attributed to an efficient organic-Tb energy transfer. The energy transfer mechanism was studied by the use of time resolved photoluminescence measurements. The melamine lifetime undergoes to a significant decrease when adsorbed to oxide surfaces and it was connected to a sensitization mechanism. The detailed analysis of time decay profile of Terbium radiative recombination shows a variation of double exponential law toward a single exponential one. Its correlation with surface defects and non-radiative recombination was thus discussed.
Parole Chiave:  Physics and Astronomy (all)
Tipologia: 1.1 Articolo in rivista

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