The microsecond Photoluminescence decay of as-prepared porous silicon
varies from sample to sample, but atmospheric oxidation at 200 degrees
C far 200 h gives rise to exactly identical exponential distribution
of decay time with luminescence energy for any porous silicon sample.
Discussion is made to demonstrate that we observe the characteristic p
hotoluminescence decay and the related parameters for oxidized porous
silicon. (C) 1997 Elsevier Science Ltd.