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Structural effect of a two-dimensional SiO2 photonic crystal layer on extraction efficiency in sputter-deposited Y2O3:Eu3+ thin-film phosphors

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4 Author(s)
Ko, Ki-Young ; Department of Chemistry, Kookmin University, Seoul 136-702, Korea ; Lee, Young Kwang ; Do, Young Rag ; Huh, Young-Duk

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We determined the effects of varying the structural parameters of two-dimensional (2D) square lattice SiO2 photonic crystal (PC) arrays on the efficiency of extraction of the photoluminescence (PL) of sputter-deposited Y2O3:Eu3+ thin films, in which the interface between the phosphor layer and the quartz substrate was modified with the 2D SiO2 PC pattern. The structural parameters of the 2D PC pattern were optimized according to their effects on the light extraction efficiency and similar trends were found for both the as-grown and the post-annealed samples; the samples with lattice constants in the range 400-600 nm exhibit the largest enhancement, there is increased enhancement with pattern height increases up to ∼420 nm, and the samples with a filling ratio of ∼0.20 exhibit the maximum enhancement of the extraction efficiency. For 2D PC patterns with a depth of 420 nm, a lattice constant of 600 nm, and a filling ratio of 0.2, the optimum PL extraction efficiencies of as-grown (350 °C) and post-annealed (900 °C) Y2O3:Eu3+ thin-film phosphors were improved by factors of more than 8.6 and 4.8, respectively, with respect to those of flat Y2O3:Eu3+ thin films. We investigated the reasons for this difference between the enhancements of the extraction efficiencies of the as-grown and post-annealed Y2O3:Eu3+ thin films deposited on 2D PC quartz substrates, in order to determine the factors affecting the extraction efficiencies of 2D PC lay- er assisted thin-film phosphors.

Published in:

Journal of Applied Physics  (Volume:102 ,  Issue: 1 )