Light extraction efficiency and radiation patterns of III-nitride light-emitting diodes with colloidal microlens arrays with various aspect ratios
IEEE Photonics Journal, 2011•ieeexplore.ieee.org
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 …
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 …
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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