High-refractive-index TiO2-nanoparticle-loaded encapsulants for light-emitting diodes
By F. Mont, Jong Kyu Kim, M. Schubert, E. Fred Schubert, R. W. Siegel. 2008
149 citations recorded by the source corpus.
A high-refractive-index (high-n) encapsulant is highly desirable because it can result in enhancement of light-extraction efficiency from high-n semiconductor light-emitting diode (LED) chips. A uniform dispersion of TiO2 nanoparticles in epoxy for LED encapsulation is demonstrated for surfactant-coated TiO2 nanoparticles by drying, mixing with a solvent, refluxing, centrifuging, and mixing with epoxy. The refractive index of surfactant-coated TiO2-nanoparticle-loaded epoxy is 1.67 at 500nm, significantly higher than that of conventional epoxy (n=1.53). Theoretical analysis of optical scattering in nanoparticle-loaded encapsulants reveals that the diameter of nanoparticles and the volume loading fraction of nanoparticles are of critical importance for optical scattering. Quasispecular transparency of the encapsulant film can be achieved if the thickness of the film is kept below the optical scattering length. A graded-refractive-index multilayer encapsulation structure with the thickness of each layer bei...
Subfields: Computational Mechanics, Electrical and Electronic Engineering
View Paper: https://www.semanticscholar.org/paper/ce077bbdc00ee67b67a4ecdedf0a4223f20531d7
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In Computational Mechanics
In Electrical and Electronic Engineering
Citations in the corpus
- Enhancement of light extraction from light emitting diodes (2011, background): “The issues related to the optimization of the encapsulant such as its loading with nanoparticles to increase the refractive index [127], an additional scattering layer around the chip [128] and light-converting phosphor [129–132] or alternative conversion aids such as fluorescent nanospheres [133,13”