Jump to main content
Jump to site search

Issue 14, 2014
Previous Article Next Article

Extraction of light trapped due to total internal reflection using porous high refractive index nanoparticle films

Author affiliations

Abstract

TiO2 nanoparticle layers composed of columnar TiO2 nanoparticle piles separated with nanoscale pores were fabricated on the bottom surface of the hemispherical glass prism by performing gas phase cluster beam deposition at glancing incidence. The porosity as well as the refractive index of the nanoparticle layer was precisely tuned by the incident angle. Effective extraction of the light trapped in the substrate due to total internal reflection with the TiO2 nanoparticle layers was demonstrated and the extraction efficiency was found to increase with the porosity. An enhanced Rayleigh scattering mechanism, which results from the columnar aggregation of the nanoparticles as well as the strong contrast in the refractive index between pores and TiO2 nanoparticles in the nanoporous structures, was proposed. The porous TiO2 nanoparticle coatings were fabricated on the surface of GaN LEDs to enhance their light output. A nearly 92% PL enhancement as well as a 30% EL enhancement was observed. For LED applications, the enhanced light extraction with the TiO2 nanoparticle porous layers can be a supplement to the microscale texturing process for light extraction enhancement.

Graphical abstract: Extraction of light trapped due to total internal reflection using porous high refractive index nanoparticle films

Back to tab navigation

Publication details

The article was received on 26 Feb 2014, accepted on 09 Apr 2014 and first published on 11 Apr 2014


Article type: Paper
DOI: 10.1039/C4NR01065E
Author version
available:
Download author version (PDF)
Nanoscale, 2014,6, 8177-8184

  •   Request permissions

    Extraction of light trapped due to total internal reflection using porous high refractive index nanoparticle films

    P. Mao, F. Sun, H. Yao, J. Chen, B. Zhao, B. Xie, M. Han and G. Wang, Nanoscale, 2014, 6, 8177
    DOI: 10.1039/C4NR01065E

Search articles by author

Spotlight

Advertisements