Color-Tunable Luminescence of Eu-Doped LaF3 Particles Sensitized by d–f Energy Transfer from a Two-Photon Absorbing Ir(III) Complex Ye, Yating Jiménez Gallego, Juan Ramón Quesada Moreno, María del Mar Navarro, Amparo Ortega Naranjo, Esther María Orte Gutiérrez, Ángel Herrera Martínez, Juan Manuel d–f energy transfer iridium luminescence lanthanide nanoparticles The surface of Eu0.3La0.7F3 submicron particles is functionalized with a blue-emitting Ir(III) complex (1) specifically designed to coordinate lanthanide(III) ions efficiently through a carboxylic unit. In this Eu0.3La0.7F3@1 composite, the Ir(III) complexes are randomly coordinated to either superficial La(III) ions or Eu(III) ions (Ir-Lasurface and Ir-Eusurface pairs, respectively) and its color emission, a balance between blue (Ir-based) and red (Eu-based) light, can be tuned as a function of the excitation wavelength. Irradiation at the maximum of the excitation band in 1 promotes blue emission from Ir-Lasurface pairs and red emission from Eusurface ions sensitized by Ir → Eusurface energy transfer (EnT). At λexc = 396 nm (maximum of the Eu(III) 5L6 ← 7F0 absorption band) the red emission from inner Eu(III) ions becomes dominant. Excitation of 1 can also be achieved by two photon-absorption (TPA) since this complex has a moderate cross-section of σ2 = 9.4 ± 1.0 GM at 780 nm (σ2 = 5.8 ± 0.6 GM at 800 nm). Phosphorescence lifetime imaging (PLIM) allows the emission of individual particles to be visualized and the Ir-, Eusurface-, and Eucore-based emissions can be distinguished due to the significant differences in their respective emission lifetimes. 2024-11-27T07:13:32Z 2024-11-27T07:13:32Z 2024-03-11 journal article Y. Ye, J.-R. Jiménez, M. M. Quesada-Moreno, A. Navarro, E. M. Ortega-Naranjo, A. Orte, J. M. Herrera, Color-Tunable Luminescence of Eu-Doped LaF3 Particles Sensitized by d–f Energy Transfer from a Two-Photon Absorbing Ir(III) Complex. Adv. Optical Mater. 2024, 12, 2302954. https://doi.org/10.1002/adom.202302954 https://hdl.handle.net/10481/97411 10.1002/adom.202302954 eng http://creativecommons.org/licenses/by-nc/4.0/ open access Atribución-NoComercial 4.0 Internacional Wiley