13 February 2007 High refractive index nanoparticle-loaded encapsulants for light-emitting diodes
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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.
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Frank W. Mont, Frank W. Mont, Jong Kyu Kim, Jong Kyu Kim, Martin F. Schubert, Martin F. Schubert, Hong Luo, Hong Luo, E. Fred Schubert, E. Fred Schubert, Richard W. Siegel, 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); doi: 10.1117/12.723305; https://doi.org/10.1117/12.723305


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