Presentation Information
[10a-P01-32]EELS characterization of nano-light sources generated by electron beam irradiation
〇(B)Kanta Hirai1, Tomoyasu Fujimaru2, Masato Inamata2, Hiromu Tanaka2, Midori Ikeuchi3, Hidehiro Yamashita3, Shiro Ihara3, Mitsuhiro Murayama3,4, Hikaru Saito3 (1.Kyushu Univ., 2.IGSES, Kyushu Univ., 3.IMCE, Kyushu Univ., 4.Virginia Tech.)
Keywords:
Nano-Light Source,Electron Beam Irradiation,Halide Perovskite
The study of Inamata shows that CsPbBr3/Cs4PbBr6 composites’ light emission increase by strong electron beam irradiation, but it was unclear if this was due to the growth of existing CsPbBr3 nanocrystals or the creation of new ones from the Cs4PbBr6 matrix. To resolve this, we used a sample that was phase-separated by heat treatment to create distinct Cs4PbBr6 and CsPbBr3 regions. We irradiated strong electron beam only to a Cs4PbBr6 crystal grain, and the area was subsequently analyzed using electron energy-loss spectroscopy (EELS). The EELS results confirmed the generation of new CsPbBr3 crystals within the irradiated area. In addition, the size of these generated crystal was calculated to be approximately 42 nm from an EELS map. These results show that nano-light sources of several tens of nanometers can be generated at arbitrary location within the Cs4PbBr6 region.