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Enhanced light extraction of light-emitting diodes with micro patterns by femtosecond laser micromachining for visible light communication

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Abstract

A significant enhancement of light extraction of light-emitting diodes (LEDs) with micro patterns has been experimentally investigated. The micro patterns on the surface of a polymer layer are fabricated by a femtosecond laser Bessel beam for obtaining microhole arrays with large depth, resulting in the reduction of photon loss by total internal reflection (TIR) at the surface of the LED. The light output power of the LED is apparently increased by introducing the array patterns without influencing its current-voltage (I-V) characteristics. Moreover, the electroluminescence spectra of a multi-color LED and its angular radiation profiles with orthogonal and hexagonal patterns also have been explored. In addition, the optical field distributions of the micro patterns simulated by the finite difference time domain method have expressed the modulation effect of the array depth. Finally, the patterned LED as a transmitter is embedded in the visible light communication system for evaluating the transmission signal quality.

© 2020 Optical Society of America

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Supplementary Material (1)

NameDescription
Supplement 1       Results for the spectra, morphology, and light efficiency of the micro patterns on LED fabricated by Gaussian and Bessel laser beams.

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