Structural and luminescence properties of undoped and Eu-doped SiOC thin films

We report on the investigation of the structural, chemical and optical properties of undoped and Eu-doped SiOC thin films synthetized by RF magnetron sputtering. Undoped SiOC exhibits an intense room temperature luminescence at ~ 500 nm, and an important contribution to this signal is due to the presence of Si-C bonds. Moreover, when inserted in a SiOC matrix, Eu ions have a higher solid solubility with respect to pure SiO2; as a consequence, we observe a reduction of Eu clustering phenomena. Furthermore the reducing properties of SiOC, related to the presence of C, allow the prevalence of the Eu2+ emission over the Eu3+ one. Through the control of the annealing conditions it is possible to obtain an intense light emission at 440 nm. These properties propose SiOC as a novel and efficient Si-based host matrix for Eu and open the way to promising perspectives of Eu-based materials for photonic applications and LED fabrication.

[1]  F. Iacona,et al.  New strategies to improve the luminescence efficiency of Eu ions embedded in Si-based matrices , 2013 .

[2]  F. Priolo,et al.  Eu3+ reduction and efficient light emission in Eu2O3 films deposited on Si substrates. , 2012, Optics express.

[3]  Lu Jin,et al.  Structure and luminescence evolution of annealed Europium-doped silicon oxides films. , 2010, Optics express.

[4]  Mengbing Huang,et al.  White light emission from amorphous silicon oxycarbide (a-SiCxOy) thin films: Role of composition and postdeposition annealing , 2010 .

[5]  G. Dong,et al.  Reduction of Eu3+ to Eu2+ in Eu-doped high silica glass prepared in air atmosphere , 2010 .

[6]  M. Helm,et al.  Anomalous wear-out phenomena of europium-implanted light emitters based on a metal-oxide-semiconductor structure , 2009 .

[7]  T. Hayakawa,et al.  Blue light emission from Eu2+ ions in sol-gel-derived Al2O3―SiO2 glasses , 2009 .

[8]  T. He,et al.  Preparation, characterization, and optical properties of nano- and submicron-sized Y2O3:Eu3+ phosphors , 2009 .

[9]  H. Shirai,et al.  White light emission from silicon oxycarbide films prepared by using atmospheric pressure microplasma jet , 2009 .

[10]  V. Lysenko,et al.  Color control of white photoluminescence from carbon-incorporated silicon oxide , 2008 .

[11]  M. Helm,et al.  Blue and red electroluminescence of Europium-implanted metal-oxide-semiconductor structures as a probe for the dynamics of microstructure , 2008 .

[12]  Blue emission from Eu2+-doped high silica glass by near-infrared femtosecond laser irradiation , 2008 .

[13]  J. Salonen,et al.  Strong White Photoluminescence from Carbon-Incorporated Silicon Oxide Fabricated by Preferential Oxidation of Silicon in Nano-Structured Si:C Layer , 2007 .

[14]  Wolfgang Skorupa,et al.  Switchable two-color electroluminescence based on a Si metal-oxide-semiconductor structure doped with Eu , 2007 .

[15]  A. Kaloyeros,et al.  Efficient energy transfer from silicon oxycarbide matrix to Er ions via indirect excitation mechanisms , 2007 .

[16]  E. Eisenbraun,et al.  Photoluminescence in erbium doped amorphous silicon oxycarbide thin films , 2005 .

[17]  J. Shin,et al.  Enhancement of the green, visible Tb3+ luminescence from Tb-doped silicon-rich silicon oxide by C co-doping , 2004 .

[18]  J. Shin,et al.  Intense blue-white luminescence from carbon-doped silicon-rich silicon oxide , 2004 .

[19]  A. Quaranta,et al.  Synthesis and luminescent properties of novel Eu2+-doped silicon oxycarbide glasses , 2004 .

[20]  B. Garrido,et al.  White luminescence from Si+ and C+ ion-implanted SiO2 films , 2003 .

[21]  Jesper Lægsgaard,et al.  Dissolution of rare-earth clusters in SiO2 by Al codoping: A microscopic model , 2002 .

[22]  Photoluminescence studies of SiC nanocrystals embedded in a SiO2 matrix , 2001 .

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