Semiconductor Nanoplatelet Excimers,Nano Letters

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Semiconductor Nanoplatelet Excimers
Nano Letters ( IF 9.6 ) Pub Date : 2018-09-24 00:00:00 , DOI: 10.1021/acs.nanolett.8b02865
Benjamin T. Diroll ₁ , Wooje Cho ₂ , Igor Coropceanu ₂ , Samantha M. Harvey _{3,

4} , Alexandra Brumberg ₃ , Nicholas Holtgrewe ₅ , Scott A. Crooker ₆ , Michael R. Wasielewski _{3,

4} , Vitali B. Prakapenka ₅ , Dmitri V. Talapin ₂ , Richard D. Schaller _{1,

3,

4}

Affiliation

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.

中文翻译：

半导体纳米血小板准分子

准分子是“激发的二聚体”的代表，是由激发态的荧光团与基态的邻近分子之间的电子相互作用形成的瞬态物质，已被广泛用作激光增益介质。尽管在分子荧光团中很常见，但这项工作为在新型材料中形成准分子提供了证据：原子精确的二维半导体纳米片。CdSe的胶体纳米片在低温下显示出两种颜色的光致发光，其中一个带归因于带边荧光，而另一个红色带归因于受激准分子荧光。以前对双色荧光的合理解释（例如充电）与其他证据不一致。与其他材料系统中的准分子一样，准分子的发射通过增加纳米血小板的浓度和界面堆积的程度而增加。与它们作为低阈值增益介质的承诺相一致，受激准分子发射谱线出现了放大的自发发射。

更新日期：2018-09-24

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