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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 6 — Mar. 17, 2008
  • pp: 3680–3685

Active packing method for blue light-emitting diodes with photosensitive polymerization: formation of self-focusing encapsulates

Hao Wang, Jae-Hyoung Ryu, Kyu-Seung Lee, Chun Hua Tan, Lihua Jin, Songmei Li, Chang-Hee Hong, Yong-Hoon Cho, and Songhao Liu  »View Author Affiliations


Optics Express, Vol. 16, Issue 6, pp. 3680-3685 (2008)
http://dx.doi.org/10.1364/OE.16.003680


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Abstract

A novel light-emitting diode (LED) packaging method, named the active packaging (AP) method, is presented in this paper. In this method, during the LED packaging process, the light emitted from a GaN LED chip itself is employed to package the LED encapsulant, thereby eliminating the need to utilize a mold. Current injection into a bare LED chip, triggers a photosensitive epoxy to polymerize, leading to the formation of mushroom lamp cap on the LED chip. The emission properties of LEDs fabricated by this method, including their emission beam profiles and light outputs, were characterized. The results showed that a self-focusing effect happened with the addition of an epoxy on the chip. The simulation demonstrated that the geometry the encapsulant controlled the beam pattern of emission. Further, the self-focusing effect was believed to be caused by the combination of the threshold energy of epoxy polymerization, the beam pattern and the power output of the LED chip.

© 2008 Optical Society of America

OCIS Codes
(220.4610) Optical design and fabrication : Optical fabrication
(250.0250) Optoelectronics : Optoelectronics

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: November 16, 2007
Revised Manuscript: January 28, 2008
Manuscript Accepted: January 29, 2008
Published: March 5, 2008

Citation
Hao Wang, Jae-Hyoung Ryu, Kyu-Seung Lee, Chun Hua Tan, Lihua Jin, Songmei Li, Chang-Hee Hong, Yong-Hoon Cho, and Songhao Liu, "Active packing method for blue light-emitting diodes with photosensitive polymerization: formation of self-focusing encapsulates," Opt. Express 16, 3680-3685 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-6-3680


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References

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