Amplified Photon Upconversion by Photonic Shell of Cholesteric Liquid Crystals

被引：52

作者：

Kang, Ji-Hwan ^{[1
]}

Kim, Shin-Hyun ^{[5
]}

Fernandez-Nieves, Alberto ^{[2
]}

Reichmanis, Elsa ^{[1
,3
,4
]}

机构：

[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[3] Georgia Inst Technol, Sch Chem & Biochem, Atlanta, GA 30332 USA

[4] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

[5] Korea Adv Inst Sci & Technol, Dept Chem & Biomol Engn, Daejeon 305701, South Korea

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2017年 / 139卷 / 16期

关键词：

LIGHT; BAND; REFLECTION; CAPSULES; PHASE;

D O I：

10.1021/jacs.7b01981

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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.

引用

页码：5708 / 5711

页数：4

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