Amplified Photon Upconversion by Photonic Shell of Cholesteric Liquid Crystals

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As an effective platform to exploit triplet triplet-annihilation-based photon upconversion (TTA-UC), microcapsules composed of a fluidic UC core and photonic shell are microfluidically prepared using a triple emulsion as the template. The photonic shell consists of cholesteric liquid crystals (CLCs) with a periodic helical structure, exhibiting a photonic band gap. Combined with planar anchoring at the boundaries, the shell serves as a resonance cavity for TTA-UC emission and enables spectral tuning of the UC under low-power-density excitation. The CLC shell can be stabilized by introducing a polymerizable mesogen in the LC host. Because of the microcapsule spherical symmetry, spontaneous emission of the delayed fluorescence is omnidirectionally amplified at the edge of the stop band. These results demonstrate the range of opportunities provided by TTA-UC systems for the future design of low-threshold photonic devices.
Publisher
AMER CHEMICAL SOC
Issue Date
2017-04
Language
English
Article Type
Article
Keywords

LIGHT; BAND; REFLECTION; CAPSULES; PHASE

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.139, no.16, pp.5708 - 5711

ISSN
0002-7863
DOI
10.1021/jacs.7b01981
URI
http://hdl.handle.net/10203/223851
Appears in Collection
CBE-Journal Papers(저널논문)
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