费斯特共振能量转移
化学
光致发光
接受者
皮秒
共振(粒子物理)
化学物理
钙钛矿(结构)
量子点
超快激光光谱学
光谱学
分子物理学
光电子学
原子物理学
凝聚态物理
结晶学
光学
材料科学
物理
荧光
量子力学
激光器
作者
Shobhana Panuganti,Lucas V. Besteiro,Eugenia S. Vasileiadou,Justin M. Hoffman,Alexander O. Govorov,Stephen K. Gray,Mercouri G. Kanatzidis,Richard D. Schaller
摘要
Two-dimensional (2D) semiconductors are attractive candidates for a variety of optoelectronic applications owing to the unique electronic properties that arise from quantum confinement along a single dimension. Incorporating nonradiative mechanisms that enable directed migration of bound charge carriers, such as Förster resonance energy transfer (FRET), could boost device efficiencies provided that FRET rates outpace undesired relaxation pathways. However, predictive models for FRET between distinct 2D states are lacking, particularly with respect to the distance d between a donor and acceptor. We approach FRET in systems with binary mixtures of donor and acceptor 2D perovskite quantum wells (PQWs), and we synthetically tune distances between donor and acceptor by varying alkylammonium spacer cation lengths. FRET rates are monitored using transient absorption spectroscopy and ultrafast photoluminescence, revealing rapid picosecond lifetimes that scale with spacer cation length. We theoretically model these binary mixtures of PQWs, describing the emitters as classical oscillating dipoles. We find agreement with our empirical lifetimes and then determine the effects of lateral extent and layer thickness, establishing fundamental principles for FRET in 2D materials.
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