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Proceedings Paper

High refractive index nanoparticle-loaded encapsulants for light-emitting diodes
Author(s): Frank W. Mont; Jong Kyu Kim; Martin F. Schubert; Hong Luo; E. Fred Schubert; Richard W. Siegel
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Paper Abstract

TiO2 nanoparticle-loaded epoxy for light-emitting diode (LED) encapsulation is demonstrated to have a refractive index of n = 1.68, higher than that of pure epoxy (n = 1.53). The dispersion of surfactant-coated TiO2 nanoparticles into epoxy is shown to reduce the number and size of TiO2 agglomerates compared to uncoated TiO2 nanoparticle-loaded epoxy. The scattering of nanoparticle-loaded media is highly dependent on nanoparticle size and loading factor. A multilayer graded refractive index structure for LED encapsulants with layer thicknesses less than the calculated mean optical scattering length is therefore proposed. The graded-index structure shows increasing optical transmittance as the number of layers increases.

Paper Details

Date Published: 13 February 2007
PDF: 8 pages
Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 64861C (13 February 2007); doi: 10.1117/12.723305
Show Author Affiliations
Frank W. Mont, Future Chips Constellation (United States)
Rensselaer Polytechnic Institute (United States)
Jong Kyu Kim, Future Chips Constellation (United States)
Rensselaer Polytechnic Institute (United States)
Martin F. Schubert, Future Chips Constellation (United States)
Rensselaer Polytechnic Institute (United States)
Hong Luo, Future Chips Constellation (United States)
Rensselaer Polytechnic Institute (United States)
E. Fred Schubert, Future Chips Constellation (United States)
Rensselaer Polytechnic Institute (United States)
Richard W. Siegel, Rensselaer Polytechnic Institute (United States)


Published in SPIE Proceedings Vol. 6486:
Light-Emitting Diodes: Research, Manufacturing, and Applications XI
Klaus P. Streubel; Heonsu Jeon, Editor(s)

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