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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 22 — Oct. 22, 2012
  • pp: 24472–24481

Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflector

Hyun-Jung Lee, Bo Ram Lee, Suk-Won Choi, and Myoung Hoon Song  »View Author Affiliations

Optics Express, Vol. 20, Issue 22, pp. 24472-24481 (2012)

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We present a simple and intriguing device that generates highly circularly polarized white light. It comprises white polymer light-emitting diodes (WPLEDs) attached to a wideband cholesteric liquid crystal (CLC) reflector with a wide photonic bandgap (PBG) covering the visible range. The degree of circular polarization realized is very high over the visible range. The wide PBG was realized by introducing a gradient in pitch of the cholesteric helix by controlling the twisting power within the CLC medium. WPLEDs fabricated using a ternary (red, green, and blue) fluorescent polymer blend with the same moiety showed a low turn-on voltage, high brightness, high efficiency, and good color stability.

© 2012 OSA

OCIS Codes
(230.0230) Optical devices : Optical devices
(230.2090) Optical devices : Electro-optical devices

ToC Category:
Optical Devices

Original Manuscript: August 6, 2012
Revised Manuscript: October 3, 2012
Manuscript Accepted: October 5, 2012
Published: October 11, 2012

Hyun-Jung Lee, Bo Ram Lee, Suk-Won Choi, and Myoung Hoon Song, "Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflector," Opt. Express 20, 24472-24481 (2012)

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