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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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

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Title
Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflector
Author
Lee, Hyun-JungLee, Bo RamChoi, Suk-WonSong, Myoung Hoon
Keywords
Cholesteric helix; Circularly polarized; Color stability; Degree of circular polarization; Fluorescent polymers; High brightness; Twisting power; Visible range; White light; White polymer light-emitting diodes; Wide-band
Issue Date
201210
Publisher
OPTICAL SOC AMER
Citation
OPTICS EXPRESS, v.20, no.22, pp.24472 - 24481
Abstract
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.
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DOI
http://dx.doi.org/10.1364/OE.20.024472
ISSN
1094-4087
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