Enhanced light extraction efficiency of GaN-based LED fabricated by multi-chip array Yoo, Hodol ; Ha, Kab ; Baek, Ji-Young ; Jung, Mee-Suk ; Su, Pei-Chen ; Kim, Yoonsu ; Cheon, Suyoung ; Cho, Soohaeng ; Kim, Kyoung-Kook Abstract Publication: Optical Materials Express Pub Date: May 2015 DOI: 10.1364/OME.5.001098 Bibcode: 2015OMExp...5.1098Y