The role of temperature in the photoluminescence quantum yield (PLQY) of Ag2S-based nanocrystals

Highly emissive Ag2S nanocrystals (NCs) passivated with a gradated shell incorporating Se and Zn were synthesized in air, and the temperature dependence of their photoluminescence quantum yield (PLQY) was quantified in both organic and aqueous media at ∼1200 nm. The relevance of this parameter, meas...

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Detalles Bibliográficos
Autores: Wang, Peijiang, Morales Márquez,Rafael, Cervás, Gabriel, Hernández Medel, Alejandro, París Ogayar, Marina, Jiménez de Aberasturi, D., de Isidro Gómez,Ana Inés, Torres Pardo, María De La Almudena, Palomares, Francisco Javier, García Orrit, Saül, Sousa, Célia T., Espinosa, Ana, Telle, Helmut H., Ortgies, Dirk H., Vega Mayoral, Víctor, Cabanillas González, Juan, Martín Rodríguez, Emma, Resch Genger, Ute, Wegner, K. David, Juárez, Beatriz H.
Tipo de recurso: artículo
Fecha de publicación:2024
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/113618
Acceso en línea:https://hdl.handle.net/20.500.14352/113618
Access Level:acceso abierto
Palabra clave:546
Química inorgánica (Química)
2303 Química Inorgánica
Descripción
Sumario:Highly emissive Ag2S nanocrystals (NCs) passivated with a gradated shell incorporating Se and Zn were synthesized in air, and the temperature dependence of their photoluminescence quantum yield (PLQY) was quantified in both organic and aqueous media at ∼1200 nm. The relevance of this parameter, measured at physiological temperatures, is highlighted for applications that rely on the near infrared (NIR) photoluminescence of NCs, such as deep NIR imaging or luminescence nanothermometry. Hyperspectral NIR imaging shows that Ag2S-based NCs with a PLQY in organic media of about 10% are inefficient for imaging at 40 °C through 20 mm thick tissue with low laser irradiation power densities. In contrast, water-transferred Ag2S-based NCs with an initial PLQY of 2% in water exhibit improved robustness against temperature changes, enabling improved imaging performance.

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