OSA's Digital Library

Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 8 — Apr. 13, 2009
  • pp: 6148–6155

Azimuthally isotropic irradiance of GaN-based light-emitting diodes with GaN microlens arrays

Mount-Learn Wu, Yun-Chih Lee, Shih-Pu Yang, Po-Shen Lee, and Jenq-Yang Chang  »View Author Affiliations


Optics Express, Vol. 17, Issue 8, pp. 6148-6155 (2009)
http://dx.doi.org/10.1364/OE.17.006148


View Full Text Article

Enhanced HTML    Acrobat PDF (488 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

In this paper, the irradiance-modifying concept is proposed by introducing a microlens array on the p-GaN layer of GaN-based light-emitting diode (LED). Every microlens can locally modulate photons emitting from a micro-scaled active region of multiple quantum wells (MQWs) just beneath the microlens. The azimuthally isotropic irradiance from the GaN-based LED with microlens arrays is demonstrated numerically and experimentally. To realize such a novel LED, one-dimensional GaN microlens array with a period of 1.6 μm and a filling factor of 0.64 are fabricated by using dry etching. According to experimental results, the azimuthally isotropic light emission of proposed LED is observed. By using the angular-resolved photoluminescence, its intensity variation corresponding to the azimuth angles is as low as 10% within the angle region of ±50°.

© 2009 Optical Society of America

OCIS Codes
(230.3670) Optical devices : Light-emitting diodes
(230.3990) Optical devices : Micro-optical devices

ToC Category:
Optical Devices

History
Original Manuscript: January 15, 2009
Revised Manuscript: March 21, 2009
Manuscript Accepted: March 31, 2009
Published: April 1, 2009

Citation
Mount-Learn Wu, Yun-Chih Lee, Shih-Pu Yang, Po-Shen Lee, and Jenq-Yang Chang, "Azimuthally isotropic irradiance of GaN-based light-emitting diodes with GaN microlens arrays," Opt. Express 17, 6148-6155 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-8-6148


Sort:  Author  |  Year  |  Journal  |  Reset  

References

  1. T. Fujii, Y. Gao, R. Sharma, E. L. Hu, S. P. DenBaars, and S. Nakamura, "Increase in the extraction efficiency of GaN-based light-emitting diodes via surface roughening," Appl. Phys. Lett. 84, 855-857 (2004). [CrossRef]
  2. S. I. Na, G. Y. Ha, D. S. Han, S. S. Kim, J. Y. Kim, J. H. Lim, D. J. Kim, K. I. Min, and S. J. Park, "Selective wet etching of p-GaN for efficient GaN-based light-emitting diodes," IEEE Photon. Technol. Lett. 18, 1512-1514 (2006). [CrossRef]
  3. C. H. Kuo, C. C. Lin, S. J. Chang, Y. P. Hsu, J. M. Tsai, W. C. Lai, and P. T. Wang, "Nitride-based light-emitting diodes with p-AlInGaN surface layers," IEEE Tran. Electron. Dev. 52, 2346-2349 (2005). [CrossRef]
  4. A. David, T. Fuji, R. Sharma, K. McGroddy, S. Nakamura, S. P. DenBaars, E. L. Hu, and C. Weisbuch, "Photonic-crystal GaN light-emitting diodes with tailored guided modes distribution," Appl. Phys. Lett. 88, 061124 (2006). [CrossRef]
  5. C. H. Chao, S. L. Chung, and T. L. Wu, "Theoretical demonstration of enhancement of light extraction of flip-chip GaN light-emitting diodes with photonic crystals," Appl. Phys. Lett. 89, 091116 (2006). [CrossRef]
  6. A. David, T. Fuji, B. Moran, S. Nakamura, S. P. DenBaars, R. Sharma, K. McGroddy, E. L. Hu, and C. Weisbuch, "Photonic-crystal GaN light-emitting diodes with tailored guided modes distribution," Appl. Phys. Lett. 88, 061124 (2006). [CrossRef]
  7. H. W. Choi, C. W. Jeon, and M. D. Dawson, "InGaN microring light-emitting diodes," IEEE Photon. Technol. Lett. 16, 33-35 (2004). [CrossRef]
  8. K. H. Kim, J. Li, S. X. Jin, J. Y. Lin, and H. X. Jiang, "III-nitride ultraviolet light-emitting diodes with delta doping," Appl. Phys. Lett. 83, 566-568 (2003). [CrossRef]
  9. M. Yamada, T. Mitani, Y. Narukawa, S. Shioji, I. Niki, S. Sonobe, K. Deguchi, M. Sano, and T. Mukai, "InGaN-based near-ultraviolet and blue-light-emitting diodes with high external quantum efficiency using a patterned sapphire substrate and a mesh electrode," Jpn. J Appl. Phys. 41, 1431-1433 (2002). [CrossRef]
  10. S. J. Chang, W.S. Chen, S. C. Shei, T. K. Ko, C. F. Shen, Y. P. Hsu, C. S. Chang, J. M. Tsai, W. C. Lai, and A. J. Lin, "Highly Reliable High-Brightness GaN-Based Flip Chip LEDs," IEEE Tran. Adv. Packaging 30, (2007).
  11. I. Moreno and U. Contreras, "Color distribution from multicolor LED arrays," Opt. Express 15, 3607-3618 (2007) [CrossRef] [PubMed]
  12. A. Borbely, S. G. Johnson, "Performance of phosphor-coated light-emitting diode optics in ray-trace simulations," Opt. Eng. 44, 111308 (2005). [CrossRef]
  13. C. Deller, G. Smith, and J. Franklin, "Colour mixing LEDs with short microsphere doped acrylic rods," Opt. Express 12, 3327-3333 (2004) [CrossRef] [PubMed]
  14. I. Moreno, M. Avendano-Alejo, and R. I. Tzonchev, "Designing light-emitting diode arrays for uniform near-field irradiance," Appl. Opt. 45, 2265-2272 (2006). [CrossRef] [PubMed]
  15. I. Moreno, J. Munoz, and R. Ivanov, "Uniform illumination of distant targets using a spherical light-emitting diode array," Opt. Eng. 46, 033001 (2007). [CrossRef]
  16. H. T. Hsueh, J. -F. T. Wang, C. H. Chao, W. Y. Yeh, C. F. Lai, H. C. Kuo, T. C. Lu, and S. C. Wang, "Azimuthal Anisotropy of Light Extraction from Photonic Crystal Light-emitting Diodes," in Conference on Lasers and Electro-Optics/Pacific Rim 2007, (Optical Society of America, 2007), paper ThF1_4. [CrossRef]
  17. M. D. B. Charlton, M. E. Zoorob, and T. Lee, "Photonic Quasi-Crystal LEDs Design, modeling, and optimization," Proc. SPIE 6486, 64860R-1-64860R-10 (2007).
  18. H. W. Choi, C. Liu, E. Gu, G. McConnell, J. M. Girkin, I. M. Watson, and M. D. Dawson, "GaN micro-Light Emitting Diode Arrays with Monolithically-integrated Sapphire micro-lenses," Appl. Phys. Lett. 84, 2253-2255 (2004). [CrossRef]

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.


« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited