Journal
OPTICS EXPRESS
Volume 20, Issue 22, Pages 24472-24481Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.024472
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Funding
- Mid-career Researcher Program [2012-046931]
- National Research Foundation of Korea [2012R1A2A2A06046931, 2009-0085470] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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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. (C) 2012 Optical Society of America
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