Single-Crystalline Optical Microcavities from Luminescent Dendrimers

Kohei Iwai; Hiroshi Yamagishi; Colin Herzberger; Yuji Sato; Hayato Tsuji; Ken Albrecht; Kimihisa Yamamoto; Fumio Sasaki; Hiroyasu Sato; Aswin Asaithambi; Axel Lorke; Yohei Yamamoto

doi:10.1002/anie.202000712

Single-Crystalline Optical Microcavities from Luminescent Dendrimers

Angew Chem Int Ed Engl. 2020 Jul 27;59(31):12674-12679. doi: 10.1002/anie.202000712. Epub 2020 May 20.

Authors

Kohei Iwai¹, Hiroshi Yamagishi¹, Colin Herzberger^{2

3}, Yuji Sato², Hayato Tsuji², Ken Albrecht^{4

5

6}, Kimihisa Yamamoto^{4

5}, Fumio Sasaki⁷, Hiroyasu Sato⁸, Aswin Asaithambi⁹, Axel Lorke⁹, Yohei Yamamoto¹

Affiliations

¹ Department of Materials Science, Faculty of Pure and Applied Sciences, and, Tsukuba Research Center for Energy Materials Science (TREMS), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8573, Japan.
² Department of Chemistry, Faculty of Science, Kanagawa University, 2946 Tsuchiya, Hiratsuka, 259-1293, Japan.
³ Institute of Organic Chemistry, Clausthal University of Technology, Adolph-Roemer-Straße 2A, 38678, Clausthal-Zellerfeld, Germany.
⁴ Laboratory for Chemistry and Life Science, Tokyo Institute of Technology, 4259 Nagatsuta Midori-ku, Yokohama, 226-8503, Japan.
⁵ ERATO Yamamoto Atom Hybrid Project, Japan Science and Technology Agency (JST), 4259 Nagatsuta Midori-ku, Yokohama, 226-8503, Japan.
⁶ Institute for Materials Chemistry and Engineering, Kyushu University, 6-1 Kasuga-koen, Fukuoka, 816-8580, Japan.
⁷ Electronics and Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki, 305-8568, Japan.
⁸ Rigaku Corporation, 12-9-3 Matsubara, Akishima, Tokyo, 196-8666, Japan.
⁹ Faculty of Physics and CENIDE, University of Duisburg-Essen, Lotharstraße 1, 47057, Duisburg, Germany.

PMID: 32338404
DOI: 10.1002/anie.202000712

Abstract

Microcrystallites are promising minute mirrorless laser sources. A variety of luminescent organic compounds have been exploited along this line, but dendrimers have been inapplicable owing to their fragility and extremely poor crystallinity. Now, a dendrimer family that overcomes these difficulties is presented. First-, second-, and third-generation carbazole (Cz) dendrimers with a carbon-bridged oligo(phenylenevinylene) (COPV2) core (GnCOPV2, n=1-3) assemble to form microcrystals. The COPV2 cores align uni/bidirectionally in the crystals while the Cz units in G2- and G3COPV2 align omnidirectionally. The dendrons work as light-harvesting antennas that absorb non-polarized light and transfer it to the COPV2 core, from which a polarized luminescence radiates. Furthermore, these crystals act as laser resonators, where the lasing thresholds are strongly coupled with the crystal morphology and the orientation of COPV2, which is in contrast with the conventional amorphous dendrimers.

Keywords: dendrimers; laser chemistry; light harvesting; microcavities; photochemistry.

Abstract

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