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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 1 — Jan. 1, 2012
  • pp: 88–90

Improving the optical performance of InGaN light-emitting diodes by altering light reflection and refraction with triangular air prism arrays

Ji Hye Kang, Hyung Gu Kim, S. Chandramohan, Hyun Kyu Kim, Hee Yun Kim, Jae Hyoung Ryu, Young Jae Park, Yun Seon Beak, Jeong-Sik Lee, Joong Seo Park, Volodymyr V. Lysak, and Chang-Hee Hong  »View Author Affiliations


Optics Letters, Vol. 37, Issue 1, pp. 88-90 (2012)
http://dx.doi.org/10.1364/OL.37.000088


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Abstract

The effect of triangular air prism (TAP) arrays with different distance-to-width (d/w) ratios on the enhancement of light extraction efficiency (LEE) of InGaN light-emitting diodes (LEDs) is investigated. The TAP arrays embedded at the sapphire/GaN interface act as light reflectors and refractors, and thereby improve the light output power due to the redirection of light into escape cones on both the front and back sides of the LED. Enhancement in radiometric power as high as 117% and far-field angle as low as 129° are realized with a compact arrangement of TAP arrays compared with that of a conventional LED made without TAP arrays under an injection current of 20 mA.

© 2012 Optical Society of America

OCIS Codes
(130.0250) Integrated optics : Optoelectronics
(230.0230) Optical devices : Optical devices
(230.3670) Optical devices : Light-emitting diodes
(260.6970) Physical optics : Total internal reflection
(250.5590) Optoelectronics : Quantum-well, -wire and -dot devices

ToC Category:
Optical Devices

History
Original Manuscript: September 28, 2011
Manuscript Accepted: November 15, 2011
Published: December 24, 2011

Citation
Ji Hye Kang, Hyung Gu Kim, S. Chandramohan, Hyun Kyu Kim, Hee Yun Kim, Jae Hyoung Ryu, Young Jae Park, Yun Seon Beak, Jeong-Sik Lee, Joong Seo Park, Volodymyr V. Lysak, and Chang-Hee Hong, "Improving the optical performance of InGaN light-emitting diodes by altering light reflection and refraction with triangular air prism arrays," Opt. Lett. 37, 88-90 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-1-88

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