Plasmonic-Enhanced Luminescence Characteristics of Microscale Phosphor Layers on a ZnO Nanorod-Arrayed Glass Substrate

Oh Hyeon Kwon, Jin Woo Jang, Sun Joo Park, Jun Sik Kim, Sung Jun Hong, Ye Seul Jung, Heesun Yang, Young Joo Kim, Yong Soo Cho

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We present a planar luminescent layer for glare-free, long-lifespan white light-emitting diodes (LEDs), with attractive light outputs. The novel and facile remote phosphor approach proposed in this work enhances luminescence properties by combining a waveguiding ZnO-based nanostructure with plasmonic Au nanoparticles. The system comprised a microscale yellow phosphor layer that is applied by simple printing onto an Au nanoparticle-dispersed ZnO nanorod array. This architecture resulted in a considerable enhancement in luminous efficacy of approximately 18% because of the combination of waveguide effects from the nanorod structure and plasmonic effects from the Au nanoparticles. Performance was optimized according to the length of the Zn nanorods and the concentration of Au. An optimal efficiency of ∼84.26 lm/W for a silicate phosphor-converted LED was achieved using long ZnO nanorods and an Au concentration of 12.5 ppm. The finite-difference time-domain method was successfully used to verify the luminous efficacy improvements in the Au nanoparticle-intervened nanostructures via the waveguiding and plasmonic effects.

Original languageEnglish
Pages (from-to)1004-1012
Number of pages9
JournalACS Applied Materials and Interfaces
Volume11
Issue number1
DOIs
Publication statusPublished - 2019 Jan 9

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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