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Thermal Dynamics Induced by Surface Acoustic Waves in Lanthanide-Doped Core@Multishell Nanoparticles

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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