To achieve a high transmittance and extinction ratio for the polarized white light-emitting diodes (WLEDs), the package structures of polarized WLEDs that are pumped by blue LEDs are studied. A WLED is implemented using a nano-wire grid polarizer (NWGP) and forms a pumping cavity. Combining the reflection and transmission characteristics of a NWGP, the optimized package structure has an air gap between the phosphor resin and the NWGP. Specifically, the angular dependence of the chromaticity coordinates and spatial uniformity of the radiation pattern are investigated and are more uniform than those of conventional LEDs.

© 2013 OSA

1. M. F. Weber, C. A. Stover, L. R. Gilbert, T. J. Nevitt, and A. J. Ouderkirk, “Giant birefringent optics in multilayer polymer mirrors,” Science287(5462), 2451–2456 (2000). [CrossRef] [PubMed]
2. J. M. Jonza and D. Dubner Andrew, “Multilayer Polymeric Color-shifting Polarizer Films,” in Optical Security and Counterfeit Deterrence Techniques, SPIE-IS&T Electronic Imaging (SPIE, 2004), 256–263.
3. S. H. Kim, J.-D. Park, and K.-D. Lee, “Fabrication of a nano-wire grid polarizer for brightness enhancement in liquid crystal display,” Nanotechnology17(17), 4436–4438 (2006). [CrossRef]
4. X. J. Yu and H. S. Kwok, “Optical wire-grid polarizers at oblique angles of incidence,” J. Appl. Phys.93(8), 4407–4412 (2003). [CrossRef]
5. I. Yamada, K. Takano, M. Hangyo, M. Saito, and W. Watanabe, “Terahertz wire-grid polarizers with micrometer-pitch Al gratings,” Opt. Lett.34(3), 274–276 (2009). [CrossRef] [PubMed]
6. S.-W. Ahn, K.-D. Lee, J.-S. Kim, S. H. Kim, J.-D. Park, S.-H. Lee, and P.-W. Yoon, “Fabrication of a 50 nm half-pitch wire grid polarizer using nanoimprint lithography,” Nanotechnology16(9), 1874–1877 (2005). [CrossRef]
7. M. F. Schubert, S. Chhajed, J. K. Kim, E. F. Schubert, and J. Cho, “Linearly polarized emission from GaInN lightemitting diodes with polarization-enhancing reflector,” Opt. Express15(18), 11213–11218 (2007). [CrossRef] [PubMed]
8. J.-C. Su, S.-F. Song, and H.-S. Chen, “Chromaticity stability of phosphor-converted white light-emitting diodes with an optical filter,” Appl. Opt.50(2), 177–182 (2011). [CrossRef] [PubMed]
9. Ö. Sepsi, I. Szanda, and P. Koppa, “Investigation of polarized light emitting diodes with integrated wire grid polarizer,” Opt. Express18(14), 14547–14552 (2010). [CrossRef] [PubMed]
10. D. Kim, “Polarization characteristics of a wire-grid polarizer in a rotating platform,” Appl. Opt.44(8), 1366–1371 (2005). [CrossRef] [PubMed]
11. F. Meng, J. Chu, H. Han, and K. Zhao, “The design of the sub-wavelength wire-grid polarizer,” in 2007 7th IEEE International Conference on Nanotechnology - IEEE-NANO 2007), 942–946.
12. T. Liu and M. O'Neill, “Increasing LCD energy efficiency with specialty light-management films,” Inform Display24, 24–30 (2008).

Appl. Opt.

• J.-C. Su, S.-F. Song, and H.-S. Chen, “Chromaticity stability of phosphor-converted white light-emitting diodes with an optical filter,” Appl. Opt.50(2), 177–182 (2011). [CrossRef] [PubMed]
• D. Kim, “Polarization characteristics of a wire-grid polarizer in a rotating platform,” Appl. Opt.44(8), 1366–1371 (2005). [CrossRef] [PubMed]

Inform Display

• T. Liu and M. O'Neill, “Increasing LCD energy efficiency with specialty light-management films,” Inform Display24, 24–30 (2008).

J. Appl. Phys.

• X. J. Yu and H. S. Kwok, “Optical wire-grid polarizers at oblique angles of incidence,” J. Appl. Phys.93(8), 4407–4412 (2003). [CrossRef]

Nanotechnology

• S.-W. Ahn, K.-D. Lee, J.-S. Kim, S. H. Kim, J.-D. Park, S.-H. Lee, and P.-W. Yoon, “Fabrication of a 50 nm half-pitch wire grid polarizer using nanoimprint lithography,” Nanotechnology16(9), 1874–1877 (2005). [CrossRef]
• S. H. Kim, J.-D. Park, and K.-D. Lee, “Fabrication of a nano-wire grid polarizer for brightness enhancement in liquid crystal display,” Nanotechnology17(17), 4436–4438 (2006). [CrossRef]

Opt. Express

• M. F. Schubert, S. Chhajed, J. K. Kim, E. F. Schubert, and J. Cho, “Linearly polarized emission from GaInN lightemitting diodes with polarization-enhancing reflector,” Opt. Express15(18), 11213–11218 (2007). [CrossRef] [PubMed]
• Ö. Sepsi, I. Szanda, and P. Koppa, “Investigation of polarized light emitting diodes with integrated wire grid polarizer,” Opt. Express18(14), 14547–14552 (2010). [CrossRef] [PubMed]

Opt. Lett.

• I. Yamada, K. Takano, M. Hangyo, M. Saito, and W. Watanabe, “Terahertz wire-grid polarizers with micrometer-pitch Al gratings,” Opt. Lett.34(3), 274–276 (2009). [CrossRef] [PubMed]

Science

• M. F. Weber, C. A. Stover, L. R. Gilbert, T. J. Nevitt, and A. J. Ouderkirk, “Giant birefringent optics in multilayer polymer mirrors,” Science287(5462), 2451–2456 (2000). [CrossRef] [PubMed]

Other

• J. M. Jonza and D. Dubner Andrew, “Multilayer Polymeric Color-shifting Polarizer Films,” in Optical Security and Counterfeit Deterrence Techniques, SPIE-IS&T Electronic Imaging (SPIE, 2004), 256–263.
• F. Meng, J. Chu, H. Han, and K. Zhao, “The design of the sub-wavelength wire-grid polarizer,” in 2007 7th IEEE International Conference on Nanotechnology - IEEE-NANO 2007), 942–946.

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