Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflector
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- Highly circularly polarized white light using a combination of white polymer light-emitting diode and wideband cholesteric liquid crystal reflector
- Lee, Hyun-Jung; Lee, Bo Ram; Choi, Suk-Won; Song, Myoung Hoon
- 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
- OPTICAL SOC AMER
- OPTICS EXPRESS, v.20, no.22, pp.24472 - 24481
- 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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