Photoluminescence of oxidized porous silicon treated by sodium borohydride aqueous solution

Alkaline solutions are usually used to remove porous layer from porous silicon. However, novel star-like photoluminescent oxidized porous silicon (PS) particles have been successfully fabricated in sodium borohydride (NaBH4) solution in this work. It is interesting that porous layer has been oxidize...

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Bibliographic Details
Published in:Materials letters 2012-05, Vol.75, p.115-117
Main Authors: Mo, Yan, Ren, Anshu, Mao, Jianfei, Zhou, Zaide, Yuan, Hongyan, Du, Juan, Xiao, Dan
Format: Article
Language:English
Subjects:
Borohydrides
Constants
heat treatment
hydrogen
hydrolysis
lighting
Luminescence
mercury
Nanocrystals
Oxides
Oxidized porous silicon
Photoluminescence
Porous materials
Porous silicon
Quantum confinement
Silicon
Sodium
sodium hydroxide
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Summary:Alkaline solutions are usually used to remove porous layer from porous silicon. However, novel star-like photoluminescent oxidized porous silicon (PS) particles have been successfully fabricated in sodium borohydride (NaBH4) solution in this work. It is interesting that porous layer has been oxidized in NaBH4 alkaline solution, rather than being removed. Silicon oxide is formed due to the constant reactions of silicon nanocrystals and NaOH. Then these oxides are adjusted to star-like morphology by the pressure of H2. Both NaOH and H2 are generated from the hydrolysis of NaBH4. Oxidized PS shows bright orange photoluminescence (PL) at 550nm. This emission can be simply tuned into red or blue by illumination of high pressure mercury lamp or high temperature treatment. The PL of NaBH4-treated PS is originated from quantum confinement and surface state of silicon nanocrystallites. ► The unique star-like amorphous structure of silicon oxide was formed. ► The oxide was achieved in alkaline liquor, NaBH4 aqueous solution. ► The yellow photoluminescence of the oxide could be easily tuned into red or blue.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2012.01.130