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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 4516–4522

Improvement of emission uniformity by using micro-cone patterned PDMS film

Che-Yu Liu, Kuo-Ju Chen, Da-Wei Lin, Chia-Yu Lee, Chien-Chung Lin, Shih-Hsuan Chien, Min-Hsiung Shih, Gou-Chung Chi, Chun-Yen Chang, and Hao-Chung Kuo  »View Author Affiliations


Optics Express, Vol. 22, Issue 4, pp. 4516-4522 (2014)
http://dx.doi.org/10.1364/OE.22.004516


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Abstract

Micro-patterned PDMS film was fabricated and combined with LED chip on board (COB) package to improve the emission uniformity of LED chip. The micro scale patterned sapphire substrate (PSS) was used as a mold to fabricate micro-cone patterned PDMS (MC-PDMS) film. A strong scattering effect from this MC-PDMS film can be verified by the high haze ratio and the Bi-directional Transmission effect. The angle dependent color temperature measurement system was used to measure the ΔCCT of COB with and without MC-PDMS. The measurement results indicate that the ΔCCT was reduced from 1025K to 428K. This improvement can effectively eliminate the yellow ring effect of LED chip. This technology can be thus considered as a cost-effective way for the next generation of light source packages.

© 2014 Optical Society of America

OCIS Codes
(230.2090) Optical devices : Electro-optical devices
(230.3670) Optical devices : Light-emitting diodes
(250.0250) Optoelectronics : Optoelectronics
(290.1483) Scattering : BSDF, BRDF, and BTDF

ToC Category:
Diffraction and Gratings

History
Original Manuscript: October 22, 2013
Revised Manuscript: January 28, 2014
Manuscript Accepted: February 4, 2014
Published: February 20, 2014

Citation
Che-Yu Liu, Kuo-Ju Chen, Da-Wei Lin, Chia-Yu Lee, Chien-Chung Lin, Shih-Hsuan Chien, Min-Hsiung Shih, Gou-Chung Chi, Chun-Yen Chang, and Hao-Chung Kuo, "Improvement of emission uniformity by using micro-cone patterned PDMS film," Opt. Express 22, 4516-4522 (2014)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-4-4516


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References

  1. E. F. Schubert, J. K. Kim, “Solid-state light sources getting smart,” Science 308(5726), 1274–1278 (2005). [CrossRef] [PubMed]
  2. M. R. Krames, O. B. Shchekin, R. Mueller-Mach, G. O. Mueller, L. Zhou, G. Harbers, M. G. Craford, “Status and future of high-power light-emitting diodes for solid-state lighting,” J. Disp. Technol 3(2), 160–175 (2007). [CrossRef]
  3. N. Narendran, N. Maliyagoda, L. Deng, and R. Pysar, “Characterizing LEDs for general illumination applications: Mixed-color and phosphor-based white sources,” in Solid State Lighting and Displays, I. T. Ferguson, Y. S. Park, N. Narendran, and S. P. DenBaars, eds. (SPIE, 2001), pp. 137–147.
  4. H. C. Kuo, C. W. Hung, H. C. Chen, K. J. Chen, C. H. Wang, C. W. Sher, C. C. Yeh, C. C. Lin, C. H. Chen, Y. J. Cheng, “Patterned structure of Remote Phosphor for phosphor-converted white LEDs,” Opt. Express 19(Suppl 4), A930–A936 (2011). [CrossRef] [PubMed]
  5. H. C. Chen, K. J. Chen, C. C. Lin, C. H. Wang, H. V. Han, H. H. Tsai, H. T. Kuo, S. H. Chien, M. H. Shih, H. C. Kuo, “Improvement in uniformity of emission by ZrO₂ nano-particles for white LEDs,” Nanotechnology 23(26), 265201 (2012). [CrossRef] [PubMed]
  6. Z. Liu, K. Wang, X. Luo, and S. Liu, “Realization of High Spatial Color Uniformity for White light-Emitting Diodes by Remote Hemispherical YAG: Ce Phosphor Film,” in 2010 Proceedings 60th Electronic Components and Technology Conference(2010), pp. 1703–1707. [CrossRef]
  7. J. Lau, Chip On Board Technologies for Multichip Modules (Kluwer Academic Publishers, 1994).
  8. Z. Liu, S. Liu, K. Wang, X. Luo, “Optical Analysis of Color Distribution in White LEDs With Various Packaging Methods,” IEEE. Photonic. Tech. L 20(24), 2027–2029 (2008). [CrossRef]
  9. H. Y. Lin, Y. J. Chen, C. C. Chang, X. F. Li, S. C. Hsu, C. Y. Liu, “Pattern-Coverage Effect on Light Extraction Efficiency of GaN LED on Patterned-Sapphire Substrate,” Electrochem. Solid. St 15(3), H72–H74 (2012). [CrossRef]
  10. T. V. Cuong, H. S. Cheong, H. G. Kim, H. Y. Kim, C. H. Hong, E. K. Suh, H. K. Cho, B. H. Kong, “Enhanced light output from aligned micropit InGaN-based light emitting diodes using wet-etch sapphire patterning,” Appl. Phys. Lett. 90(13), 131107 (2007). [CrossRef]
  11. L. Ya-Ju, C. Ching-Hua, K. Chih Chun, L. Po Chun, L. Tien-Chang, K. Hao-Chung, W. Shing-Chung, “Study of the excitation power dependent internal quantum efficiency in InGaN/GaN LEDs grown on patterned sapphire substrate,” IEEE. J. Sel. Top. Quant 15(4), 1137–1143 (2009). [CrossRef]
  12. Y. K. Ee, J. M. Biser, W. Cao, H. M. Chan, R. P. Vinci, N. Tansu, “Metalorganic Vapor Phase Epitaxy of III-Nitride Light-Emitting Diodes on Nanopatterned AGOG Sapphire Substrate by Abbreviated Growth Mode,” IEEE J. Sel. Top. Quant. 15(4), 1066–1072 (2009). [CrossRef]
  13. Y. K. Ee, X. H. Li, J. Biser, W. Cao, H. M. Chan, R. P. Vinci, N. Tansu, “Abbreviated MOVPE nucleation of III-nitride light-emitting diodes on nano-patterned sapphire,” J. Cryst. Growth 312(8), 1311–1315 (2010). [CrossRef]
  14. Y. Li, S. You, M. Zhu, L. Zhao, W. Hou, T. Detchprohm, Y. Taniguchi, N. Tamura, S. Tanaka, C. Wetzel, “Defect-reduced green GaInN/GaN light-emitting diode on nanopatterned sapphire,” Appl. Phys. Lett. 98(15), 151102 (2011). [CrossRef]
  15. Y. K. Ee, P. Kumnorkaew, R. A. Arif, H. Tong, J. F. Gilchrist, N. Tansu, “Light extraction efficiency enhancement of InGaN quantum wells light-emitting diodes with polydimethylsiloxane concave microstructures,” Opt. Express 17(16), 13747–13757 (2009). [CrossRef] [PubMed]
  16. W. H. Koo, W. Youn, P. Zhu, X.-H. Li, N. Tansu, F. So, “Light Extraction of Organic Light Emitting Diodes by Defective Hexagonal-Close-Packed Array,” Adv. Funct. Mater. 22(16), 3454–3459 (2012). [CrossRef]
  17. Y. K. Ee, R. A. Arif, N. Tansu, P. Kumnorkaew, J. F. Gilchrist, “Enhancement of light extraction efficiency of InGaN quantum wells light emitting diodes using SiO(2)/polystyrene microlens arrays,” Appl. Phys. Lett. 91(22), 221107 (2007). [CrossRef]
  18. X. H. Li, R. Song, Y. K. Ee, P. Kumnorkaew, J. F. Gilchrist, N. Tansu, “Light Extraction Efficiency and Radiation Patterns of III-Nitride Light-Emitting Diodes With Colloidal Microlens Arrays With Various Aspect Ratios,” IEEE. Photonics. J. 3(3), 489–499 (2011). [CrossRef]
  19. C. C. Lin, W. L. Liu, C. Y. Hsieh, “Scalar scattering model of highly textured transparent conducting oxide,” J. Appl. Phys. 109(1), 014508 (2011). [CrossRef]
  20. K. J. Chen, H. C. Chen, C. C. Lin, C. H. Wang, C. C. Yeh, H. H. Tsai, S. H. Chien, M. H. Shih, H. C. Kuo, “An Investigation of the Optical Analysis in White Light-Emitting Diodes With Conformal and Remote Phosphor Structure,” J. Disp. Technol 9(11), 915–920 (2013). [CrossRef]
  21. C. H. Hung, C. H. Tien, “Phosphor-converted LED modeling by bidirectional photometric data,” Opt. Express 18(Suppl 3), A261–A271 (2010). [CrossRef] [PubMed]
  22. K. J. Chen, H. V. Han, B. C. Lin, H. C. Chen, M. H. Shih, S. H. Chien, K. Y. Wang, H. H. Tsai, P. Yu, P. T. Lee, C. C. Lin, H. C. Kuo, “Improving the Angular Color Uniformity of Hybrid Phosphor Structures in White Light-Emitting Diodes,” IEEE Electron Device Lett. 34(10), 1280–1282 (2013). [CrossRef]
  23. X. H. Lee, I. Moreno, C.-C. Sun, “High-performance LED street lighting using microlens arrays,” Opt. Express 21(9), 10612–10621 (2013). [CrossRef] [PubMed]

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