Showing papers by "Leigh T. Canham published in 1995"
573 citations
TL;DR: In this paper, an all solid state, VLSI compatible, electroluminescent device based on porous silicon with an external quantum efficiency greater than 0.1% under CW operation was presented.
Abstract: The authors report an all solid state, VLSI compatible, electroluminescent device based on porous silicon with an external quantum efficiency greater than 0.1% under CW operation. The emission, which is broadband and peaks at 600 nm, is detected above a low threshold current density and voltage of 0.01 Am-2 and 2.3 V, respectively.
169 citations
TL;DR: In this article, the temporal variation of the visible photoluminescence from rapid thermally oxidized porous silicon prepared from n+ substrates was studied, and it was shown that the blue (fast band) emission becomes prevalent only after samples are stored in ambient air.
Abstract: We have studied the temporal variation of the visible photoluminescence from rapid thermally oxidized porous silicon prepared from n+ substrates. In contrast to the red (slow band) emission, which is observable immediately after high‐temperature oxidation, the blue (fast band) emission is shown to become prevalent only after samples are stored in ambient air. The intensity of the blue emission increases with progressive aging, the magnitude of the increase being dependent on the temperature at which the material is oxidized. Thermal treatment of aged rapid thermally oxidized material can reduce and even quench the blue photoluminescence. Quenching is reversible in that the photoluminescence re‐appears after further aging at room temperature.
48 citations
TL;DR: In this article, the spin-orbit interaction in luminescent porous silicon was studied and the radiative lifetime of the triplet exciton was determined by the spinorbit interaction.
Abstract: We present a theoretical treatment of the spin-orbit interaction in luminescent porous silicon. We calculate the radiative lifetime of the triplet exciton, which is determined by the spin-orbit interaction, and compare the results with experiment. We discuss previous work on the optically detected magnetic resonance (ODMR) of porous silicon. We show that the spin-orbit interaction causes a substantial fine-structure broadening of the ODMR. Other workers have argued that the large linewidth of the triplet ODMR cannot be explained within the quantum-confinement theory of porous silicon. Our results demonstrate that this argument is incorrect.
35 citations
TL;DR: In this paper, the response of a range of porous Si films to acellular simulated body fluids has been monitored by SEM, EDX and FTIR analyses, and quite low levels of porosity are shown to induce hydroxyapatite growth both on top of the film, and even on neighbouring areas of bulk Si, which in isolation have no such effect.
Abstract: The response of a range of porous Si films to acellular simulated body fluids has been monitored by SEM, EDX and FTIR analyses. Quite low levels of porosity are shown here to induce hydroxyapatite growth both on top of the film, and even on neighbouring areas of bulk Si, which in isolation have no such effect. The in-vitro demonstration of hydroxyapatite nucleation by a porous semiconductor could provide further insight into the phenomenon of bioactivity and help realise a broader range of bioactive materials.
15 citations