Author/Authors :
Ramيrez، نويسنده , , J.M. and Jambois، نويسنده , , O. and Berencén، نويسنده , , Y. and Navarro-Urrios، نويسنده , , D. and Anopchenko، نويسنده , , A. and Marconi، نويسنده , , A. and Prtljaga، نويسنده , , N. and Daldosso، نويسنده , , N. and Pavesi، نويسنده , , L. and Colonna، نويسنده , , J.-P. and Fedeli، نويسنده , , J.-M. and Garrido، نويسنده , , B.، نويسنده ,
Abstract :
We present a electroluminescence (EL) study of the Si-rich silicon oxide (SRSO) LEDs with and without Er3+ ions under different polarization schemes: direct current (DC) and pulsed voltage (PV). The power efficiency of the devices and their main optical limitations are presented. We show that under PV polarization scheme, the devices achieve one order of magnitude superior performance in comparison with DC. Time-resolved measurements have shown that this enhancement is met only for active layers in which annealing temperature is high enough (>1000 °C) for silicon nanocrystal (Si-nc) formation. Modeling of the system with rate equations has been done and excitation cross-sections for both Si-nc and Er3+ ions have been extracted.
Keywords :
Pulsed voltage , electroluminescence , Erbium , Silicon nanocrystals (Si-ncs)
