| Texto completo | |
| Autor(es): |
Pinto, Pablo B.
;
Matrone, Pedro W.
;
Ferreira, Flavia S.
;
Santos, Paulo V.
;
Sigoli, Fernando A.
;
Couto Jr, Odilon D. D.
Número total de Autores: 6
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ADVANCED OPTICAL MATERIALS; v. N/A, p. 10-pg., 2025-03-05. |
| Resumo | |
Accurate local temperature readout in integrated nanoscaled devices driven by high-frequency surface acoustic waves (SAWs) has a strong technological interest. The optical response of lanthanide (Ln)-doped NaLnF(4) core@multishell nanoparticles inserted into SAW delay lines is reported. The recombination dynamics between the( 2)H(11/2) and S-4(3/2) to the I-4(15/2) states of Er3+ is probed under SAWs modulation at 5, 225, and 290 K. It is shown that the spectral weight of the upconverted individual Stark levels of the S-4(3/2) band changes with the SAW and that their recombination lifetimes decrease as the SAW power is increased. By monitoring the luminescence intensity ratio (LIR), it is shown that such dynamics is consistent with a temperature increase and a carrier repopulation process across the S-4(3/2) Stark levels induced by Joule heating, which can reach up to 47 K at cryogenic temperatures. These effects, however, can be strongly suppressed by reducing the SAW duty cycle during the optical measurements. The results demonstrate that heating of nanoscopic systems integrated into SAW devices can be quite pronounced and that, since they do not interact with the SAW strain or piezoelectric field, these NaLnF(4) nanoparticles can be effectively employed as nanoscale in-situ and in-operando thermometers in such kind of application. (AU) | |
| Processo FAPESP: | 21/08111-2 - Materiais conversores de luz à base de terras raras: marcadores luminescentes, sensores e amplificadores ópticos |
| Beneficiário: | Hermi Felinto de Brito |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 21/06803-4 - Modulação acústica de dinâmica excitônica em heteroestruturas de van der Waals |
| Beneficiário: | Odilon Divino Damasceno Couto Júnior |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2 |
| Processo FAPESP: | 22/03323-4 - Geração e caracterização de padrões de ondas estacionárias em linhas de atraso de ondas acústicas de superfície |
| Beneficiário: | Pedro Winckler Matrone |
| Modalidade de apoio: | Bolsas no Brasil - Iniciação Científica |
| Processo FAPESP: | 23/00191-2 - Transporte acústico de portadores e spins in heteroestruturas de dicalcogenetos de metais de transição |
| Beneficiário: | Pedro Winckler Matrone |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado Direto |