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Single‐Crystalline Optical Microcavities from Luminescent Dendrimers
Author(s) -
Iwai Kohei,
Yamagishi Hiroshi,
Herzberger Colin,
Sato Yuji,
Tsuji Hayato,
Albrecht Ken,
Yamamoto Kimihisa,
Sasaki Fumio,
Sato Hiroyasu,
Asaithambi Aswin,
Lorke Axel,
Yamamoto Yohei
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202000712
Subject(s) - luminescence , dendrimer , materials science , lasing threshold , crystallinity , amorphous solid , optoelectronics , laser , nanotechnology , photochemistry , crystallography , optics , chemistry , polymer chemistry , wavelength , physics , composite material
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 (G n COPV2, 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.