量子ドット超格子の特異な発光を室温で観測 －集団的光ブリンキングと光子バンチング－

2026-04-15 東京科学大学

図1. 超格子の作製

＜関連情報＞

• https://www.isct.ac.jp/ja/news/r3004kkysajk#top
• https://www.nature.com/articles/s41467-026-70931-0

CsPbBr3量子ドット超格子における室温での集団点滅と光子バンチング Room temperature collective blinking and photon bunching from CsPbBr3 quantum dot superlattice

Qiwen Tan,Sudipta Seth,Boris Louis,Xiayan Wu,Nithin Pathoor,Toranosuke Takagi,Shun Omagari,Takumi Sannomiya,Johan Hofkens & Martin Vacha
Nature Communications  Published:27 March 2026
DOI:https://doi.org/10.1038/s41467-026-70931-0  Unedited version

Abstract

Development of quantum systems supporting collective many-body states is crucial for advancement of quantum technologies, and perovskite quantum dots (QDs) have emerged as promising quantum light sources. However, photon bunching, a key signature of collective states, has been observed in perovskites only at cryogenic temperatures. Here, we report collective blinking and photon bunching in perovskite QD superlattices at room temperature. Sub-wavelength-sized CsPbBr₃ superlattices exhibit distinct two-level blinking, and demonstrate photon bunching with a degree of up to 3.9. Time-resolved photoluminescence and super-resolution imaging reveal long lifetime components, and emission spatially confined to regions tens of nanometers in size, observations consistent with long-range exciton migration to a localized energy trap within the superlattice. Power-dependent degree of bunching and analysis of the bunching dynamics point to biexciton–exciton cascade emission as the origin of photon bunching. These findings establish perovskite QD superlattices as a promising platform for room-temperature collective optical phenomena.