Coexistence of two different energy transfer processes in SiO2 films containing Si nanocrystals and Er

The mechanism of energy transfer from silicon nanocrystals (nc-Si) to erbium ions (Er3+) in SiO2 films containing nc-Si and Er was studied by analyzing delayed infrared luminescence from Er3+. It was found that, to theoretically reproduce the rising part of the time-dependent luminescence intensity, two different energy transfer processes, i.e., fast and slow processes, should be considered. From the fitting of the delayed luminescence to a model, the ratio of the two energy transfer processes and the energy transfer rate of the slow process were estimated. The ratio exhibited a clear dependence on the luminescence peak energy of Si nanocrystals, which act as photosensitizers for Er3+, indicating that the ratio depends on the size of nc-Si. The ratio of slow to fast processes increased with the decrease in size; this observation is a strong indication that the fast process is the direct inheritance of the process in bulk Si:Er systems, and the slow process is a characteristic process occurring only in nc-...

[1]  Maria Miritello,et al.  Electroluminescence at 1.54 μm in Er-doped Si nanocluster-based devices , 2002 .

[2]  Anthony J. Kenyon,et al.  OPTICAL-PROPERTIES OF PECVD ERBIUM-DOPED SILICON-RICH SILICA - EVIDENCE FOR ENERGY-TRANSFER BETWEEN SILICON MICROCLUSTERS AND ERBIUM IONS , 1994 .

[3]  Excitation of Tm3+ by resonant energy transfer from Si nanocrystals , 2002 .

[4]  Domenico Pacifici,et al.  Role of the energy transfer in the optical properties of undoped and Er-doped interacting Si nanocrystals , 2001 .

[5]  Indirect excitation of 1.5 μm emission from Er3+ in silicon-rich silica , 2000 .

[6]  Pieter G. Kik,et al.  Strong exciton-erbium coupling in Si nanocrystal-doped SiO2 , 2000 .

[7]  M. Fujii,et al.  Photoluminescence from SiO2 films containing Si nanocrystals and Er: Effects of nanocrystalline size on the photoluminescence efficiency of Er3+ , 1998 .

[8]  Se-Young Seo,et al.  Optical gain at 1.54 μm in erbium-doped silicon nanocluster sensitized waveguide , 2001 .

[9]  I. Bradley,et al.  Microscopic model for nonexcitonic mechanism of 1.5-μm photoluminescence of the Er3+ ion in crystalline Si , 2003 .

[10]  Minoru Fujii,et al.  Resonant excitation of Er3+ by the energy transfer from Si nanocrystals , 2001 .

[11]  F. Koch,et al.  Optical Properties of Si Nanocrystals , 1999 .

[12]  Minoru Fujii,et al.  Spectrally resolved electronic energy transfer from silicon nanocrystals to molecular oxygen mediated by direct electron exchange , 2003 .

[13]  Allan,et al.  Hydrogenic impurity levels, dielectric constant, and Coulomb charging effects in silicon crystallites. , 1995, Physical review. B, Condensed matter.

[14]  T. Ishikawa,et al.  Site-selective x-ray absorption fine structure analysis of an optically active center in Er-doped semiconductor thin film using x-ray-excited optical luminescence , 2001 .

[15]  Keiichi Yamamoto,et al.  1.54 μm photoluminescence of Er3+ doped into SiO2 films containing Si nanocrystals: Evidence for energy transfer from Si nanocrystals to Er3+ , 1997 .

[16]  G. Franzò,et al.  The excitation mechanism of rare-earth ions in silicon nanocrystals , 1999 .

[17]  Domenico Pacifici,et al.  Modeling and perspectives of the Si nanocrystals-Er interaction for optical amplification , 2003 .

[18]  A. Polman,et al.  Erbium implanted thin film photonic materials , 1997 .

[19]  T. Ishikawa,et al.  The optically active center and its activation process in Er-doped Si thin film produced by laser ablation , 1999 .

[20]  Maria Eloisa Castagna,et al.  Si-based materials and devices for light emission in silicon , 2003 .

[21]  S. G. Bishop,et al.  Photoluminescence excitation spectroscopy of erbium-doped silicon-rich silicon oxide , 2000 .

[22]  Photoluminescence and Optically Detected Magnetic Resonance Investigations on Porous Silicon , 1993 .

[23]  A. Kenyon,et al.  Evidence of energy coupling between Si nanocrystals and Er3+ in ion-implanted silica thin films , 1999 .

[24]  Namkyoo Park,et al.  Coefficient determination related to optical gain in erbium-doped silicon-rich silicon oxide waveguide amplifier , 2002 .

[25]  Domenico Pacifici,et al.  Er3+ ions–Si nanocrystals interactions and their effects on the luminescence properties , 2000 .

[26]  Minoru Fujii,et al.  Size-dependent photoluminescence from surface-oxidized Si nanocrystals in a weak confinement regime , 2000 .

[27]  Defects in porous silicon investigated by optically detected and by electron paramagnetic resonance techniques , 1993 .

[28]  M. Lannoo,et al.  Theoretical descriptions of porous silicon , 1995 .

[29]  Excitation of intra-4f shell luminescence of Yb3+ by energy transfer from Si nanocrystals , 1998 .

[30]  S. Takeoka,et al.  Breakdown of the k-conservation rule in Si1−xGex alloy nanocrystals: Resonant photoluminescence study , 2000 .

[31]  M. Fujii,et al.  Resonant electronic energy transfer from excitons confined in silicon nanocrystals to oxygen molecules. , 2002, Physical review letters.

[32]  Mizuta,et al.  Luminescent properties of visible and near-infrared emissions from porous silicon prepared by the anodization method. , 1992, Physical review. B, Condensed matter.