准分子
光致发光
激发态
荧光团
荧光
材料科学
光电子学
半导体
准分子激光器
堆积
激子
分子物理学
光化学
光学
激光器
化学
原子物理学
物理
凝聚态物理
有机化学
作者
Benjamin T. Diroll,Wooje Cho,Igor Coropceanu,Samantha M. Harvey,Alexandra Brumberg,Nicholas Holtgrewe,S. A. Crooker,Michael R. Wasielewski,Vitali B. Prakapenka,Dmitri V. Talapin,Richard D. Schaller
出处
期刊:Nano Letters
[American Chemical Society]
日期:2018-09-24
卷期号:18 (11): 6948-6953
被引量:47
标识
DOI:10.1021/acs.nanolett.8b02865
摘要
Excimers, a portmanteau of “excited dimer”, are transient species that are formed from the electronic interaction of a fluorophore in the excited state with a neighbor in the ground state, which have found extensive use as laser gain media. Although common in molecular fluorophores, this work presents evidence for the formation of excimers in a new class of materials: atomically precise two-dimensional semiconductor nanoplatelets. Colloidal nanoplatelets of CdSe display two-color photoluminescence resolved at low temperatures with one band attributed to band-edge fluorescence and a second, red band attributed to excimer fluorescence. Previously reasonable explanations for two-color fluorescence, such as charging, are shown to be inconsistent with additional evidence. As with excimers in other materials systems, excimer emission is increased by increasing nanoplatelet concentration and the degree of cofacial stacking. Consistent with their promise as low-threshold gain media, amplified spontaneous emission emerges from the excimer emission line.
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