光致发光
量子点
等离子体子
光电子学
光子
联轴节(管道)
激子
材料科学
纳米技术
纳米材料
三极管
塞尔效应
亮度
发光
自发辐射
物理
光学
凝聚态物理
激光器
冶金
作者
Zhiyuan Wang,Jianwei Tang,Jiahao Han,Juan Xia,Tianzi Ma,Xue-Wen Chen
出处
期刊:Nano Letters
[American Chemical Society]
日期:2024-01-23
卷期号:24 (5): 1761-1768
标识
DOI:10.1021/acs.nanolett.3c04661
摘要
Colloidal quantum dots (QDs) are excellent luminescent nanomaterials for many optoelectronic applications. However, photoluminescence blinking has limited their practical use. Coupling QDs to plasmonic nanostructures shows potential in suppressing blinking. However, the underlying mechanism remains unclear and debated, hampering the development of bright nonblinking dots. Here, by deterministically coupling a QD to a plasmonic nanocavity, we clarify the mechanism and demonstrate unprecedented single-QD brightness. In particular, we report for the first time that a blinking QD could obtain nonblinking photoluminescence with a blinking lifetime through coupling to the nanocavity. We show that the plasmon-enhanced radiative decay outcompetes the nonradiative Auger process, enabling similar quantum yields for charged and neutral excitons in the same dot. Meanwhile, we demonstrate a record photon detection rate of 17 MHz from a colloidal QD, indicating an experimental photon generation rate of more than 500 MHz. These findings pave the way for ultrabright nonblinking QDs, benefiting diverse QD-based applications.
科研通智能强力驱动
Strongly Powered by AbleSci AI