Semiconductor Nanoplatelet Excimers

Diroll, Benjamin T.; Cho, Wooje; Coropceanu, Igor; Harvey, Samantha M.; Brumberg, Alexandra; Holtgrewe, Nicholas; Crooker, Scott A.; Wasielewski, Michael R.; Prakapenka, Vitali B.; Talapin, Dmitri V.; Schaller, Richard D.

doi:10.1021/acs.nanolett.8b02865

Title: Semiconductor Nanoplatelet Excimers

Journal Article · 24 September 2018 · Nano Letters

DOI: https://doi.org/10.1021/acs.nanolett.8b02865 · OSTI ID:1479966

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^[2]; Coropceanu, Igor ^[2]; Harvey, Samantha M. ^[3];

^[4]; Holtgrewe, Nicholas ^[5];

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^[3]; Prakapenka, Vitali B. ^[5];

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Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
Univ. of Chicago, IL (United States). Dept. of Chemistry
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Northwestern Univ., Evanston, IL (United States). Inst. for Sustainability and Energy
Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
Univ. of Chicago, IL (United States). Center for Advanced Radiation Sources (CARS)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials; Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry; Northwestern Univ., Evanston, IL (United States). Inst. for Sustainability and Energy

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. In conclusion, consistent with their promise as low-threshold gain media, amplified spontaneous emission emerges from the excimer emission line.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC); US Air Force Office of Scientific Research (AFOSR); USDOD

Grant/Contract Number:: AC52-06NA25396; AC02-06CH11357; DGE-1324585; FA9550-15-1-0099; DMR-1710104; EAR-1634415; FG02-94ER14466; EAR-1531583

OSTI ID:: 1479966

Alternate ID(s):: OSTI ID: 1494796

Report Number(s):: LA-UR-18-28426

Journal Information:: Nano Letters, Vol. 18, Issue 11; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 43 works

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