Effect of chip spacing on light extraction for light-emitting diode array

Shuang Chao Chung, Pei Chen Ho, Dun Ru Li, Tsung Xian Lee, Tsung Hsun Yang, Ching Cherng Sun

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


GaN LED array in packaging is important for the demand of high optical flux. In order to tighten the whole packaging size, the spacing among LED chips becomes an important factor in the packaging design. This study is to investigate the change of the light extraction when a GaN LED chip array packaging is applied. The shielding effect with various spacing for the GaN LED array with or without silicon encapsulation is obtained. We apply the Monte Carlo ray-tracing method in the simulations to analyze the optical behavior of the two major types of the GaN LED array. The shielding effect is more dominant for bare chip packaging. When a silicone thin dispensing layer is applied, the shielding effect is not obvious because of more light extraction, the neighbor dies play an important role in photon recycling.

Original languageEnglish
Pages (from-to)A640-A649
JournalOptics Express
Issue number11
StatePublished - 1 Jun 2015


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