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DC Field | Value | Language |
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dc.citation.endPage | 440 | - |
dc.citation.number | 6 | - |
dc.citation.startPage | 433 | - |
dc.citation.title | NATURE PHOTONICS | - |
dc.citation.volume | 16 | - |
dc.contributor.author | Livache, Clement | - |
dc.contributor.author | Kim, Whi Dong | - |
dc.contributor.author | Jin, Ho | - |
dc.contributor.author | Kozlov, Oleg, V | - |
dc.contributor.author | Fedin, Igor | - |
dc.contributor.author | Klimov, Victor, I | - |
dc.date.accessioned | 2024-03-11T17:05:10Z | - |
dc.date.available | 2024-03-11T17:05:10Z | - |
dc.date.created | 2024-03-11 | - |
dc.date.issued | 2022-06 | - |
dc.description.abstract | Researchers show that up-conversion in manganese-doped CdSe colloidal quantum dots enables efficient electron photoemission. The effect is exploited for high-yield production of solvated electrons, demonstrating photochemistry applicability. Materials displaying electron photoemission under visible-light excitation are of great interest for applications in photochemistry, photocathodes, advanced electron beam sources and electron microscopy. We demonstrate that in manganese-doped CdSe colloidal quantum dots (CQDs), two-step Auger up-conversion enables highly efficient electron photoemission under excitation with visible-light pulses. This effect is enabled by extremely fast, subpicosecond Auger-type energy transfer from excited manganese ions to an intrinsic CQD exciton. Since the rate of this process outpaces that of intraband cooling, the high-energy 'hot' electron produced by the first Auger-excitation step can be efficiently promoted further into the external 'vacuum' state via one more manganese-to-CQD energy-transfer step. This CQD ionization pathway exploits exceptionally large uphill energy gain rates associated with the spin-exchange Auger process and leads to photoemission efficiencies of more than 3%, orders of magnitude greater than in the case of undoped CQDs. We demonstrate that using this phenomenon, we can achieve high-yield production of solvated electrons (>3% internal quantum efficiency), which makes it of considerable utility in visible-light-driven reduction photochemistry. | - |
dc.identifier.bibliographicCitation | NATURE PHOTONICS, v.16, no.6, pp.433 - 440 | - |
dc.identifier.doi | 10.1038/s41566-022-00989-x | - |
dc.identifier.issn | 1749-4885 | - |
dc.identifier.scopusid | 2-s2.0-85129314588 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/81534 | - |
dc.identifier.wosid | 000789715900001 | - |
dc.language | 영어 | - |
dc.publisher | NATURE PORTFOLIO | - |
dc.title | High-efficiency photoemission from magnetically doped quantum dots driven by multi-step spin-exchange Auger ionization | - |
dc.type | Article | - |
dc.description.isOpenAccess | FALSE | - |
dc.relation.journalWebOfScienceCategory | Optics; Physics, Applied | - |
dc.relation.journalResearchArea | Optics; Physics | - |
dc.type.docType | Article; Early Access | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | ABSORPTION-SPECTRUM | - |
dc.subject.keywordPlus | SOLVATED ELECTRONS | - |
dc.subject.keywordPlus | SEMICONDUCTOR | - |
dc.subject.keywordPlus | TEMPERATURE | - |
dc.subject.keywordPlus | WATER | - |
dc.subject.keywordPlus | NANOCRYSTALS | - |
dc.subject.keywordPlus | RELAXATION | - |
dc.subject.keywordPlus | DYNAMICS | - |
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