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Optically functional surface structures for GaN-based light-emitting diodes
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DOI：10.1039/c3tc31620c.png)
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Abstract
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The unrestricted control of the surface structure and refractive index would allow for new and improved functionalities in optoelectronic devices. Specifically, micro-patterned graded-refractive-index (GRIN) coatings can enable control of emission pattern and promote light extraction in GaInN light-emitting diodes (LEDs). We design and demonstrate coatings that are patterned into arrays of GRIN micro-pillars, each composed of five dielectric layers of (TiO2)(x)(SiO2)(1-x) with the bottom layer (adjacent to semiconductor) having the highest refractive index and the top layer (adjacent to air) having the lowest one. The GRIN micro-pillars, including their planar geometric shape and size, are structured for emission pattern control and maximum light-extraction efficiency. It is shown that the peak emission intensity of the GRIN LEDs is controllable from +/-20 degrees to +/-50 degrees off the surface-normal. In addition, LEDs patterned with an array of four-pointed-star-shaped GRIN micro-pillars with a pillar-size of 4 mu m and spacing between neighboring pillars of 4 mu m show a 155% enhancement in light-output power over an uncoated planar reference LED.
Keywords:
REFRACTIVE-INDEX
EXTRACTION EFFICIENCY
PATTERN
DESIGN
LENS
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