Size-separation effect of blue-emitting porous silicon in RTO process

Blue-emitting porous silicon(PS) prepared by hydrothermal etching was treat ed by rapid thermal oxidation (RTO) process. Accompanying with the blue shi ft of the whole photoluminescence(PL) spectrum, the previous single Pt peak split into two separate PL peaks. Simultaneously, the size-reduction and s ize-separation of the silicon nanocrystallites were observed. This result i ndicates that the short-wavelength emissions in PS are also strongly size-d ependent.