量子点
激子
声子
发射光谱
光谱学
光发射
钙钛矿(结构)
光子
半导体
原子物理学
比克西顿
量化(信号处理)
物理
光致发光
材料科学
凝聚态物理
分子物理学
光电子学
化学
谱线
量子力学
结晶学
计算机科学
计算机视觉
作者
Gabriele Rainò,Nasser Yazdani,Simon C. Boehme,Manuel Kober‐Czerny,Chenglian Zhu,Franziska Krieg,Marta D. Rossell,Rolf Erni,Vanessa Wood,Ivan Infante,Maksym V. Kovalenko
标识
DOI:10.1038/s41467-022-30016-0
摘要
Semiconductor quantum dots have long been considered artificial atoms, but despite the overarching analogies in the strong energy-level quantization and the single-photon emission capability, their emission spectrum is far broader than typical atomic emission lines. Here, by using ab-initio molecular dynamics for simulating exciton-surface-phonon interactions in structurally dynamic CsPbBr3 quantum dots, followed by single quantum dot optical spectroscopy, we demonstrate that emission line-broadening in these quantum dots is primarily governed by the coupling of excitons to low-energy surface phonons. Mild adjustments of the surface chemical composition allow for attaining much smaller emission linewidths of 35-65 meV (vs. initial values of 70-120 meV), which are on par with the best values known for structurally rigid, colloidal II-VI quantum dots (20-60 meV). Ultra-narrow emission at room-temperature is desired for conventional light-emitting devices and paramount for emerging quantum light sources.
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