Porous silicon samples have been prepared from p-type
single-crystal silicon 〈100〉 by a
galvanostatic and an open-circuit etch in 50% HF. The materials
display bright red-orange
room-temperature photoluminescence (PL) in air and toluene solution.
Infrared measurements show that the porous silicon surface is partially oxidized.
Exposure to anthracene
(An) or 10-methylphenothiazine (MPTZ) results in dynamic quenching of
the material's
excited state(s). Nanosecond time-resolved PL decays are
complex and wavelength dependent, with average lifetimes in neat toluene of 0.3−16 μs.
Quenching by An and MPTZ is
more efficient and rapid at short observation wavelengths. The
steady-state and time-resolved quenching data are well fit to the Stern−Volmer model.
The PL decays are well
described by a skewed distribution of recombination rates.
1997 luminescence, fluorescence luminescence, fluorescence (solids and liquids) D 6540
-003Dynamic Quenching of Porous Silicon Excited States.-Porous silicon samples, prepared by a galvanostatic and an open-circuit etch in 50 wt.% HF of p-type single crystal Si(100), exhibit bright red-orange room-temp. photoluminescence (PL) in air and toluene solution. Dynamic quenching of the excited state(s) of the samples upon exposure to anthracene or 10methylphenothiazine is typical of partially oxidized porous silicon. Partial surface oxidation of Si is shown by IR measurements. Neat toluene restores the PL intensity. Excited states which emit light at high energy are quenched more rapidly and efficiently than those which emit at lower energy. -(KO, M. C.; MEYER, G.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.