A1 Refereed original research article in a scientific journal
Excitation effects and luminescence stability in porous SiO2:C layers
Authors: Vasin A, Rusavsky A, Nazarov A, Lysenko V, Rudko G, Piryatinski Y, Blonsky I, Salonen J, Makila E, Starik S
Publisher: WILEY-V C H VERLAG GMBH
Publication year: 2012
Journal: physica status solidi (a)
Journal name in source: PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
Journal acronym: PHYS STATUS SOLIDI A
Number in series: 6
Volume: 209
Issue: 6
First page : 1015
Last page: 1021
Number of pages: 7
ISSN: 1862-6300
DOI: https://doi.org/10.1002/pssa.201100815
Abstract
White-light emitting porous SiO2:C layers on silicon wafers have been fabricated by oxidation of carbonized porous silicon. The study was focused mainly on the identification of the mechanism of light emission and photo-induced degradation. The effect of carbonization temperature and exposure to intense ultraviolet irradiation on the photoluminescence (PL) properties was studied by steady state and time-resolved PL measurements. Two types of photo-induced degradation phenomena were observed: reversible and irreversible. The irreversible degradation is suggested to be associated with photo-induced chemical interaction of light emitting material with atmospheric oxygen. It is demonstrated that irreversible degradation can be reduced by encapsulation of the light-emitting material. The structural configuration of light-emitting centers and mechanism of reversible degradation are discussed.
White-light emitting porous SiO2:C layers on silicon wafers have been fabricated by oxidation of carbonized porous silicon. The study was focused mainly on the identification of the mechanism of light emission and photo-induced degradation. The effect of carbonization temperature and exposure to intense ultraviolet irradiation on the photoluminescence (PL) properties was studied by steady state and time-resolved PL measurements. Two types of photo-induced degradation phenomena were observed: reversible and irreversible. The irreversible degradation is suggested to be associated with photo-induced chemical interaction of light emitting material with atmospheric oxygen. It is demonstrated that irreversible degradation can be reduced by encapsulation of the light-emitting material. The structural configuration of light-emitting centers and mechanism of reversible degradation are discussed.
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