Mr. Mani, 

Please find few papers on the topic of your question:

1. Materials Letters, Volume 150, 1 July 2015, Pages 55-58

White light from annealed porous silicon: Broadband emission from violet to the near infrared, Marin, O. et al.

2. Journal of Materials Chemistry B, Volume 2, Issue 47, 21 December 2014, Pages 8314-8320, Engineering near-infrared fluorescent styrene-terminated porous silicon nanocomposites with bovine serum albumin encapsulation for in vivo imaging, Xia et al. 

3. Thin Solid Films, Volume 571, Issue P1, 28 November 2014, Pages 206-211

Hydrogen, oxygen and hydroxyl on porous silicon surface: A joint density-functional perturbation theory and infrared spectroscopy approach, Alfaro, P. et al. 

4. Applied Physics Letters, Volume 95, Issue 2, 2009, Article number 021906

Microstructure and infrared spectral properties of porous polycrystalline and nanocrystalline cubic silicon carbide, Fan et al. 

5.Physica Status Solidi (C) Current Topics in Solid State Physics

Volume 6, Issue 7, 2009, Pages 1546-1550

6th International Conference on Porous Semiconductor Science and Technology, PSST 2008; Mallorca; Spain; 10 March 2008 through 14 March 2008; Code 78471

Infrared study of the oxidation of porous silicon: Evidence of surface modes  

Acquaroli, L.N.et al.,

6.Radiophysics and Quantum Electronics,Volume 50, Issue 10-11, October 2007, Pages 823-831Infrared spectroscopy of nano-porous silicon  (Article)

Prokhorov, et al.