Nature CommunicationsSub-10 nm upconversion nanocrystals for long-term single-particle trackingXiaochen QiuDaoming GuanXiaojing XiaHuan LingJialing HuYunxiang ZhangEmory ChanFuyou LiQian Liu2025-10-24Full textDOI https://doi.org/10.1038/s41467-025-64180-w