期刊
IEEE PHOTONICS JOURNAL
卷 3, 期 3, 页码 489-499出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JPHOT.2011.2150745
关键词
III-Nitrides; light-emitting diodes (LEDs); light extraction efficiency; microlens arrays; far-field radiation
资金
- U.S. Department of Energy [DE-PS26-08NT00290]
- National Science Foundation [0828426]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0828426] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1028490] Funding Source: National Science Foundation
The fabrication studies of silica/polystyrene (PS) colloidal microlens arrays with various aspect ratios were performed on the III-nitride light-emitting diodes (LEDs). The use of colloidal-based microlens arrays led to significant enhancement in light extraction efficiency for III-nitride LEDs. In varying the aspect ratios of the microlens arrays, the engineering of various PS thicknesses was employed by using high-temperature treatment and redeposition process. The effects of PS thickness on the light extraction efficiency and far-field emission patterns of InGaN quantum-well (QW) LEDs were studied. The total output powers of microlens LEDs with various PS thicknesses exhibited 1.93-2.70 times enhancement over that of planar LEDs, and the use of optimized PS layer thickness is important in leading the enhancement of the light extraction efficiency in large angular direction.
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