[9p-E218-1~16] 13.8 Optical properties and light-emitting devices

1:30 PM - 1:45 PM JST(4:30 AM - 4:45 AM UTC)

[9p-E218-1] Relationship between Inter-[HfI₆]^2- Distance and optical properties in (Na,Li)₂HfI₆ Phosphor

〇(DC)Chihaya Fujiwara^1,2, Akihiro Yamaji², Shunsuke Kurosawa² (1.Graduate School of Eng., Tohoku Univ., 2.Graduate School of Eng., Nagoya Univ.)

Keywords:

Halide perovskite

Zero-dimensional halide perovskites A₂BX₆ exhibit room-temperature self-trapped exciton (STE) emission due to exciton localization within isolated [BX₆]^2- octahedra, making them promising candidates for LED and scintillator applications. However, the quantitative relationship between the inter-octahedral distance and emission properties remains unclear. In this study, we employed (Na,Li)₂HfI₆, in which the [HfI6]^2- inter-octahedral distance can be systematically controlled via Li substitution, and performed temperature-dependent photoluminescence measurements (15–375 K, UVSOR) together with DFT calculations. Multi-Gaussian fitting revealed a blue-shift of the emission peak with increasing Li content, as well as the emergence of a narrow emission component attributable to free excitons.