Transient Species Mediating Energy Transfer to Spin-Forbidden Mn d States in II-VI Semiconductor Quantum Dots
| Autor: | Giulio Cerullo, Kushagra Gahlot, Andrea Camellini, K R Pradeep, Ranjani Viswanatha, Gianluca Sirigu, Umesh V. Waghmare, Margherita Zavelani-Rossi, Anjali Singh |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials Chemistry2506 Metals and Alloys
Materials science Spin states Band gap Energy Engineering and Power Technology quantum dots 02 engineering and technology 010402 general chemistry 01 natural sciences Resonance (particle physics) Chemistry (miscellaneous) Renewable Energy Sustainability and the Environment Fuel Technology Mn doping Materials Chemistry Renewable Energy Spin (physics) energy transfer Sustainability and the Environment Doping 021001 nanoscience & nanotechnology 0104 chemical sciences Chemical physics Femtosecond ultrafast charge dynamics Density functional theory Transient (oscillation) 0210 nano-technology |
| Zdroj: | ACS energy letters 4 (2019): 729–735. doi:10.1021/acsenergylett.9b00064 info:cnr-pdr/source/autori:Gahlot, Kushagra; Pradeep, K. R.; Camellini, Andrea; Sirigu, Gianluca; Cerullo, Giulio; Zavelani-Rossi, Margherita; Singh, Anjali; Waghmare, Umesh V.; Viswanatha, Ranjani/titolo:Transient Species Mediating Energy Transfer to Spin-Forbidden Mn d States in II-VI Semiconductor Quantum Dots/doi:10.1021%2Facsenergylett.9b00064/rivista:ACS energy letters/anno:2019/pagina_da:729/pagina_a:735/intervallo_pagine:729–735/volume:4 |
| DOI: | 10.1021/acsenergylett.9b00064 |
| Popis: | The nature of the transient species leading to emission from the spin/orbital-forbidden Mn d–d transition in doped semiconductor quantum dots has intrigued scientists for a long time. This understanding is important in the quest for energy efficiency as the energy from the conduction band is transferred efficiently to Mn in the femtosecond time scale overcoming other nonradiative recombination pathways. In this work, we have shown the presence of the transient species using materials with band gaps in resonance with the energy of the Mn emission to understand the nature of the absorbing, transient, and emitting species. Detailed studies lead to the emergence of a transient Mn3+ state that is further corroborated with spin-dependent density functional theory calculations. This opens up a unique opportunity to realize a reversible photochemical reaction and high radiative efficiency in a semiconductor nanostructure by controlling the spin state of the magnetic ion by external illumination. |
| Databáze: | OpenAIRE |
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