Dependence of radiative lifetimes of porous silicon on excitation wavelength and intensity

Excited state radiative lifetime measurements are made on porous silicon as a function of excitation wavelength and excitation intensity. The results indicate that a simple quantum confinement model for the light absorption a nd emission mechanism is not suitable. We support our results by suggesting that a cascading energy transfer process among surface molecule-like state s is most likely active and we provide a general indication of the density of energy transfer states. (C) 2000 American Institute of Physics. [S0003-6 951(00)00319-3].