Light Extraction Efficiency and Radiation Patterns of III-Nitride Light-Emitting Diodes With Colloidal Microlens Arrays With Various Aspect Ratios
By Xiao-Hang Li, Renbo Song, Y. Ee, P. Kumnorkaew, J. Gilchrist, Nelson Tansu. IEEE Photonics Journal, 2011
209 citations recorded by the source corpus.
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.
Subfields: Condensed Matter Physics, Materials Chemistry, Surfaces, Coatings and Films
View Paper: https://www.semanticscholar.org/paper/28e670af3a8e965cdc87c8ea046d5e2c57a7d26c
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In Condensed Matter Physics
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Citations in the corpus
- Metal assisted chemical etching for high aspect ratio nanostructures: A review of characteristics and applications in photovoltaics (2012, background): “Many applications including solar cells, thermoelectrics, and other optoelectronics that involve structures that are currently fabricated by dry etch or bottom-up growth and assembly techniques, can benefit from this facile fabrication technique tremendously, including GaN based solar cells [78] and”
- Advances in the LED Materials and Architectures for Energy-Saving Solid-State Lighting Toward “Lighting Revolution” (2012, background): “Meanwhile, the addition of a microlenses array on top of the device is capable of increasing the light extraction efficiency by more than two times [48]–[49] because of the increase in effective photon escape cone and a reduced level of internal reflection resulted from the grading of refractive ind”