期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 139, 期 16, 页码 5708-5711出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.7b01981
关键词
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资金
- School of Chemical and Biomolecular Engineering of the Georgia Institute of Technology
- School of Physics of the Georgia Institute of Technology
- Brook Byers Institute for Sustainable Systems
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.
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