Academic Journal
Dual-emitting dot-in-bulk cdse/cds nanocrystals with highly emissive core-and shell-based trions sharing the same resident electron
| العنوان: | Dual-emitting dot-in-bulk cdse/cds nanocrystals with highly emissive core-and shell-based trions sharing the same resident electron |
|---|---|
| المؤلفون: | Pinchetti, Valerio, Shornikova, Elena V., Qiang, Gang, Bae, Wan Ki, Meinardi, Francesco, Crooker, Scott A., Yakovlev, Dmitri R., Bayer, Manfred, Klimov, Victor I., Brovelli, Sergio |
| المساهمون: | Pinchetti, V, Shornikova, E, Qiang, G, Bae, W, Meinardi, F, Crooker, S, Yakovlev, D, Bayer, M, Klimov, V, Brovelli, S |
| بيانات النشر: | American Chemical Society US |
| سنة النشر: | 2019 |
| المجموعة: | Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
| مصطلحات موضوعية: | charged excitons/trion, core/shell heterostructure, dual emission, Nanocrystal, spin dynamic |
| الوصف: | Colloidal CdSe nanocrystals (NCs) overcoated with an ultrathick CdS shell, also known as dot-in-bulk (DiB) structures, can support two types of excitons, one of which is core-localized and the other, shell-localized. In the case of weak "sub-single-exciton" pumping, emission alternates between the core-and shell-related channels, which leads to two-color light. This property makes these structures uniquely suited for a variety of photonic applications as well as ideal model systems for realizing complex excitonic quasi-particles that do not occur in conventional core/shell NCs. Here, we show that the DiB design can enable an unusual regime in which the same long-lived resident electron can endow trionlike characteristics to either of the two excitons of the DiB NC (core-or shell-based). These two spectrally distinct trion states are apparent in the measured photoluminescence (PL) and spin dynamics of core and shell excitons conducted over a wide range of temperatures and applied magnetic fields. Low-Temperature PL measurements indicate that core-and shell-based trions are characterized by a nearly ideal (â 100%) emission quantum yield, suggesting the strong suppression of Auger recombination for both types of excitations. Polarization-resolved PL experiments in magnetic fields of up to 60 T reveal that the core-and the shell-localized trions exhibit remarkably similar spin dynamics, which in both cases are controlled by spin-flip processes involving a heavy hole. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| Relation: | info:eu-repo/semantics/altIdentifier/pmid/31651177; info:eu-repo/semantics/altIdentifier/wos/WOS:000502687500063; volume:19; issue:12; firstpage:8846; lastpage:8854; numberofpages:9; journal:NANO LETTERS; http://hdl.handle.net/10281/254711; info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85074937175 |
| DOI: | 10.1021/acs.nanolett.9b03676 |
| الاتاحة: | http://hdl.handle.net/10281/254711 https://doi.org/10.1021/acs.nanolett.9b03676 |
| رقم الانضمام: | edsbas.29C33C81 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1021/acs.nanolett.9b03676 |
|---|