[9p-C309-1~13] 12.8 Specific theme: Photoelectric Properties, Structural Controls and Device of Perovskites Materials

3:00 PM - 3:15 PM JST(6:00 AM - 6:15 AM UTC)Presentation by Applicant for JSAP Young Scientists Presentation Award

[9p-C309-5] Synthesis of Sn/Ge halide nanocrystals and their application as orange-red scintillators

〇(B)Kiryu Sato¹, Koryu Sato², Amu Sato², Yutaka Fujimoto³, Takayuki Chiba^1,2 (1.Yamagata Univ., 2.Yamagata Univ. Grad. Schl. of Org. Mater. Sci., 3.Tohoku Univ. Grad. Schl. of Eng.)

Keywords:

scintillator,Self-Trapped Exciton,lead-free halide nanocrystals

In this study, we synthesized lead-free Sn/Ge halide nanocrystals exhibiting broadband long-wavelength luminescence optimized for silicon photodetectors. Benefiting from a novel structure where Sn/Ge-centered octahedral units are embedded within a robust CsBr host lattice, intense orange-red emission centered at 630 nm (FWHM: 150 nm) was achieved with a high PLQY exceeding 90%. This emission originates from self-trapped excitons (STEs), and its large Stokes shift is expected to suppress self-absorption. Furthermore, we fabricated nanocrystal/polymer composite films and demonstrated their radioluminescence scintillation response under X-ray irradiation.