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

Full Article  |  PDF Article
More Like This
Femtosecond laser direct writing of microholes on roughened ZnO for output power enhancement of InGaN light-emitting diodes

Zhigang Zang, Xiaofeng Zeng, Jihe Du, Ming Wang, and Xiaosheng Tang
Opt. Lett. 41(15) 3463-3466 (2016)

High-speed integrated micro-LED array for visible light communication

Hao-Yu Lan, I-Chen Tseng, Yung-Hsiang Lin, Gong-Ru Lin, Ding-Wei Huang, and Chao-Hsin Wu
Opt. Lett. 45(8) 2203-2206 (2020)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

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.

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics