ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Recently the present authors’ group found that porous silicon showed strong and stablewhite/white-blue light emission after successive thermal carbonization and oxidation by water vapor.This material can be considered as a price-competitive solid-state white-light source. We examinedthese layers by electron energy-loss spectroscopy (EELS), energy-filtering transmission electronmicroscopy (EFTEM). The EEL spectra indicated that the silicon skeleton in the porous layer wascompletely oxidized by the thermal treatment in wet argon ambient and multi-types of carbon phaseswere present in the 1073 K oxidized sample of stronger emission, while carbon complexes includingSi and/or O were formed in the 1223 K oxidized sample of weaker light emission. EF-TEM imagesshowed that carbon/oxygen were more uniformly distributed in the 1223 K oxidized sample. It isassumed that the strong light-emitting properties are controlled by the size and internal chemicalbonding states of carbon clusters incorporated
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/17/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.561-565.1127.pdf