[20a-E101-1~10] 12.3 Functional Materials and Novel Devices

[20a-E101-6] Single-crystal microcavities of light-harvesting dendrimers

〇Kohei Iwai¹, Hiroshi Yamagishi¹, Hayato Tsuji², Ken Albrecht³, Humio Sasaki⁴, Hiroyasu Sato⁵, Yohei Yamamoto¹ (1.F. of Pure and Apply. Sci., Univ. of Tsukuba, 2.F. of Sci., Kanagawa Univ., 3.IMCE, Kyushu Univ., 4.AIST, 5.Rigaku)

Keywords:organic laser, dendrimer

Here, we demonstrate the first optical microcavities that were solely made of a multi-generation light-harvesting dendrimer. Newly synthesized 1-3rd generation light-harvesting dendrimers having a carbon-bridged oligo-para-phenylenevinylene core and multi-branched carbazole shells self-assembled into well-shaped single crystals, respectively. The crystal structures of 1st- and 2nd-generation dendrimers were confirmed by single-crystal X-ray diffraction analysis. When micro-scale crystals of these dendrimers were irradiated with 397 nm laser, their photoluminescence were efficiently confined and resonated in the crystals. Upon irradiating much intense light, stimulated emission occures. Two-dimentinnl finite-differece time-domain simulations revealed that the light confinment in the micro-scale crystals of 3rd-generation dendrimer is based on FP-mode and WGM.