Au–Ag nanoalloy molecule-like clusters for enhanced quantum efficiency emission of Er3+ ions in silica. Cesca, T., Kalinic, B., Michieli, N. T., Maurizio, C., Angela, T., Scian, C., Giancarlo, B., Mazzoldi, P., & Mattei, G. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 17:28262–28269, 2015.
doi  abstract   bibtex   
The occurrence of a very efficient non-resonant energy transfer process forming ultrasmall Au–Ag nanoalloy clusters and Er3+ ions is investigated in silica. The enhancement of the room temperature Er3+ emission efficiency by an order of magnitude is achieved by coupling rare-earth ions to molecule-like (AuxAg1x)N alloy nanoclusters with N = 10–15 atoms and x = 0.6 obtained by optimized sequential ion implantation on Er-implanted silica. For comparison, AuN nanoclusters obtained by the same approach and with the same size and numerical density showed an enhancement by only a factor of 2 with respect to pure Er emission, demonstrating the beneficial effect of using nanoalloyed clusters. The temperature evolution of the energy transfer process is investigated by photoluminescence and exhibits a maximum efficiency at about 600 °C, where the clusters reach the optimal size and the silica matrix completely recovers the implantation damage. The nanoalloy cluster composition and size have been studied by EXAFS analysis, which indicated a stronger Ag–O interaction with respect to the Au–O one and a preferential location of the Ag atoms at the nanoalloy cluster surface.
@article{
	11577_3156459,
	author = {Cesca, Tiziana and Kalinic, Boris and Michieli, Niccolo' Tomaso and Maurizio, Chiara and Angela, Trapananti and Scian, Carlo and Giancarlo, Battaglin and Mazzoldi, Paolo and Mattei, Giovanni},
	title = {Au–Ag nanoalloy molecule-like clusters for enhanced quantum efficiency emission of Er3+ ions in silica},
	year = {2015},
	journal = {PHYSICAL CHEMISTRY CHEMICAL PHYSICS},
	volume = {17},
	abstract = {The occurrence of a very efficient non-resonant energy transfer process forming ultrasmall Au–Ag nanoalloy clusters and Er3+ ions is investigated in silica. The enhancement of the room temperature Er3+ emission efficiency by an order of magnitude is achieved by coupling rare-earth ions to molecule-like (AuxAg1x)N alloy nanoclusters with N = 10–15 atoms and x = 0.6 obtained by optimized sequential ion implantation on Er-implanted silica. For comparison, AuN nanoclusters obtained by the same approach and with the same size and numerical density showed an enhancement by only a factor of 2 with respect to pure Er emission, demonstrating the beneficial effect of using nanoalloyed clusters. The temperature evolution of the energy transfer process is investigated by photoluminescence and exhibits a maximum efficiency at about 600 °C, where the clusters reach the optimal size and the silica matrix completely recovers the implantation damage. The nanoalloy cluster composition and size have been studied by EXAFS analysis, which indicated a stronger Ag–O interaction with respect to the Au–O one and a preferential location of the Ag atoms at the nanoalloy cluster surface.},
	doi = {10.1039/C5CP01084E},
	pages = {28262--28269}
}

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