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Proceedings Paper

A numerical analysis of a high-index nanocomposite encapsulant and a roughened surface
Author(s): Young-Gu Ju; Tae-Hoon Kim
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Paper Abstract

The two dimensional Finite-Difference-Time-Domain (FDTD) algorithm is used to study the optical behavior of nano-composite encapsulants. As the size of the nano-particles in an encapsulant decreases, the scattering from particles also decreases and the nano-mixture eventually becomes an optically uniform medium. Calculations of FDTD reveal the size limit of nano-particles when the transition from scatterers to an optically uniform medium occurs. As the size of the nano-particles is reduced to 0.02 λ, scattering substantially disappears and the transmission efficiency improves two-fold compared to that without nano-particles. The numerical results show that the use of a nano-composite encapsulant can improve the extraction efficiency of high-brightness light-emitting-diodes (LEDs). In addition, we simulated the roughened surface of a high-index resin layer using FDTD. The transmission efficiency of roughened surface increases 37% compared to that of the flat surface. Therefore, the combination of high-index nano-composites and a roughened surface can increase the extraction efficiency of the LEDs.

Paper Details

Date Published: 21 September 2006
PDF: 9 pages
Proc. SPIE 6355, Advanced LEDs for Solid State Lighting, 63550B (21 September 2006); doi: 10.1117/12.687783
Show Author Affiliations
Young-Gu Ju, KyungPook National Univ. (South Korea)
Tae-Hoon Kim, Korea Photonics Technology Institute (South Korea)

Published in SPIE Proceedings Vol. 6355:
Advanced LEDs for Solid State Lighting
Chang-Hee Hong; Tsunemasa Taguchi; Jung Han; Lianghui Chen, Editor(s)

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