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Proceedings Paper

Plasmonic LED device
Author(s): Manuela Lunz; Dick de Boer; Gabriel Lozano; Said R. K. Rodriguez; Jaime Gomez Rivas; Marc A. Verschuuren
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Paper Abstract

Plasmonic nanostructures are known to influence the emission of near-by emitters. They can enhance the absorption and modify the external quantum efficiency of the coupled system. To evaluate the possibility of using plasmonics to enhance the light emission of a phosphor-converted LED device and create an efficient directional light source, regular arrays of aluminium nanoparticles covered with a red dye layer are investigated. In arrays of aluminum nanocylinders with a diameter of ca 140 nm combined with a thin (650 nm) layer of luminescent material, very narrow resonances have been observed, which lead to large enhancement factors of up to 70 and 20 for excitation with a directional blue laser source and a lambertian LED respectively, in a small spectral range for particular angles. The measured resonances agree very well with finite-difference time-domain numerical simulations. These changes in the angular emission profile of the red dye as well as the spectral shape of its emission can help to optimize the efficacy of phosphor-converted LED modules and increase the amount of useable light in a certain angular cone. Using Fourier microscopy, large modifications of the angular emission profile as well as spectral shaping are observed for these plasmonic LED devices if compared to reference samples without plasmonic nanostructures.

Paper Details

Date Published: 2 May 2014
PDF: 6 pages
Proc. SPIE 9127, Photonic Crystal Materials and Devices XI, 91270N (2 May 2014); doi: 10.1117/12.2052913
Show Author Affiliations
Manuela Lunz, Philips Research (Netherlands)
Dick de Boer, Philips Research (Netherlands)
Gabriel Lozano, FOM Institute for Atomic and Molecular Physics (Netherlands)
Said R. K. Rodriguez, FOM Institute for Atomic and Molecular Physics (Netherlands)
Jaime Gomez Rivas, FOM Institute for Atomic and Molecular Physics (Netherlands)
Eindhoven Univ. of Technology (Netherlands)
Marc A. Verschuuren, Philips Research (Netherlands)

Published in SPIE Proceedings Vol. 9127:
Photonic Crystal Materials and Devices XI
Sergei G. Romanov; Gabriel Lozano; Dario Gerace; Christelle Monat; Hernán Ruy Míguez, Editor(s)

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