High refractive index nanoparticle-loaded encapsulants for light-emitting diodes

Frank W. Mont; Jong Kyu Kim; Martin F. Schubert; Hong Luo; E. Fred Schubert; Richard W. Siegel

doi:10.1117/12.723305

13 February 2007 High refractive index nanoparticle-loaded encapsulants for light-emitting diodes

Frank W. Mont, Jong Kyu Kim, Martin F. Schubert, Hong Luo, E. Fred Schubert, Richard W. Siegel

Proceedings Volume 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI; 64861C (2007) https://doi.org/10.1117/12.723305
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

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.

Citation Download Citation

Frank W. Mont, Jong Kyu Kim, Martin F. Schubert, Hong Luo, E. Fred Schubert, and Richard W. Siegel "High refractive index nanoparticle-loaded encapsulants for light-emitting diodes", Proc. SPIE 6486, Light-Emitting Diodes: Research, Manufacturing, and Applications XI, 64861C (13 February 2007); https://doi.org/10.1117/12.723305

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