Sensitization of the Blue-green Electroluminescence by Gadolinium Coupled to Si Nanocluster Embedded in a SiO2 Matrix

Abstract

In this work an enhancement of the blue and green electroluminescence (EL) related to silicon inclusions into SiO2 layer by gadolinium co-doping was investigated. The blue (460 nm) and green (550 nm) EL corresponds to the oxygen-deficient-centres (ODC) and Si nanoclusters with average diameter below 1 nm, respectively. After gadolinium co-doping a fourfold increase of the total EL intensity was observed. It was found that the increase of the blue and green EL is due to the energy transfer from Gd3+ ions to the ODC defects and amorphous silicon nanoclusters. Moreover, the gadolinium co-doping increases the concentration of the small silicon nanoclusters.DOI: http://dx.doi.org/10.5755/j01.ms.19.2.1789

Keywords

• electroluminescence
• Gd
• Si-nanocrystals
• MOSLED
• energy transfer