Open AccessThe variation of the enhanced photoluminescence efficiency of Y_2O_3:Eu^3+films with the thickness to the photonic crystal layer
Author(s) -
KiYoung Ko,
Young Kwang Lee,
Hoo Keun Park,
Yoon-Chang Kim,
Young Rag
Publication year - 2008
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.16.005689
Subject(s) - photoluminescence , materials science , nanorod , optics , photonic crystal , phosphor , diffraction , scattering , excitation , quantum efficiency , optoelectronics , attenuation coefficient , quartz , absorption (acoustics) , crystal (programming language) , nanotechnology , composite material , physics , electrical engineering , engineering , computer science , programming language
This study examined the effects of the thickness of Y(2)O(3):Eu(3+) phosphor films on quartz substrates coated with two-dimensional (2D) SiO(2) square-lattice nanorod photonic crystal layers (PCL) at identical heights on their extraction and absorption efficiency. The photoluminescence (PL) efficiency enhancement ratio decreased exponentially with increasing Y(2)O(3):Eu(3+) film thickness. The 2D PCL-assisted Y(2)O(3):Eu(3+) film with a thickness (t) = 400 nm showed enhancement in the upward and downward PL emission by factors of 6.2 and 8.6, respectively, with respect to those of a conventional flat film. This observation was attributed to diffraction scattering of the excitation and emission light.