Wide-range emission of Er3+/Yb3+co-doped lanthanum niobates: A study of temperature and excitation-dependent luminescence aiming at applications in Biophotonics

Author(s)

Manfre, Mateus Grecco ; Borges, Fernanda Hediger ; dos Santos, Luiz Fernando ; de Souza, Vitor dos Santos ; Castelani, Matheus ; Franca, Leonardo V. S. ; Baffa, Oswaldo ; Goncalves, Rogeria Rocha

• Document type: Journal article
• Source: Optical Materials; v. 157, p. 13-pg., 2024-11-01.

Abstract

We have synthesized Er3+,Yb3+ co-doped lanthanum niobate samples by a sol-gel route and investigated their luminescent properties under different excitation sources aiming at applications in Biophotonics. The samples were crystalline and composed primarily of orthorhombic La3NbO7 with secondary formation of monoclinic LaNbO4. We verified NIR-to-visible upconversion with the naked eye under excitation at 980 and 1550 nm; emission in the green and red regions prevailed, respectively. X-ray excitation revealed prevalent emission in the blue region, attributed to the luminescence of NbO43- groups in the lattice, as well as Er3+ emissions in the visible range. All the samples presented high relative thermal sensitivity (above 1.32 % K- 1) and repeatability above 97 % between 243 and 293 K. Based on the investigated luminescent properties, the samples prepared herein are versatile materials with a wide range of potential applications as scintillators, optical markers, energy converters for photodynamic therapy, and nanothermometers. (AU)

• FAPESP's process: 23/02852-6 - "Lanthanide doped Alkali/alkaline earth niobates and germanates: Studies of Persistent Luminescence to Active planar waveguide".
• Grantee: Vítor dos Santos de Souza
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 20/00277-6 - Development of nanoparticulate materials of lanthanide-doped rare earth tantalates for applications in Photonics
• Grantee: Fernanda Hediger Borges Ribeiro
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 23/03092-5 - Muntifunctional platform based on luminescent rare earth fluoride, oxide and silicates for Photonics and Theranostic Applications
• Grantee: Luiz Fernando dos Santos
• Support Opportunities: Scholarships abroad - Research Internship - Doctorate
• FAPESP's process: 20/04157-5 - Multifunctional Plataform based on luminescent rare earth fluoride and oxide for Theranostics
• Grantee: Luiz Fernando dos Santos
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 21/08111-2 - Development of rare earth based light converters: luminescent markers, optical sensors, and amplifiers
• Grantee: Hermi Felinto de Brito
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 20/05319-9 - Multifunctional plataforms based on lanthanide doped nanostructured luminescent materials for potential photonic and theranostic applications
• Grantee: Rogéria Rocha Gonçalves
• Support Opportunities: Regular Research Grants