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Seminar PLUM : Monday, 5th December 2022 at 11:00 am

Victor Castaing (Universidad de Sevilla)

Title: Persistent phosphors: from glow in the dark stars to advanced medical nanodisplays


Institut Néel, Room F418 (Erwin Bertaut)
Abstract : Glow in the dark starks shinning on children’s ceilings take their properties from persistent luminescence (PersL) materials. These materials, typically rare earth- or transition metal-doped oxides, feature additional defects called traps that allow them to store part of the optical energy they receive and to re-emit it gradually, leading to unique delayed and long-lasting luminescence.
Interestingly, this delayed and long lasting emission brings benefits to high societal impact application fields such as medicine (1,2). However, commercial materials giving the property to glow in the dark stars cannot be used for this novel applications. Indeed, colloidally stable nanometric sized particles featuring high crystalline quality as well as persistent luminescence properties in specific spectral ranges are needed, being thorough works on synthesis methods, chemical compositions and optical as well as biological environment highly demanded.
Works I will present are part of this research dynamic. First, preparation of persistent nanocrystals trapped in an amorphous matrix will be introduced to demonstrate critical effects of crystal size, crystal quality and chemical composition on afterglow properties (3,4).  Then, I will present a method allowing preparation of colloidally stable nanoparticles that are homogeneous in size and use them as small bricks to conceive transparent persistent coatings with unique optical properties (5). Finally, the perspectives of using persistent nanoparticles for photodynamic therapy will be discussed.
(1)         Viana, B.; Richard, C.; Castaing, V.; Glais, E.; Pellerin, M.; Liu, J.; Chanéac, C. NIR-Persistent Luminescence Nanoparticles for Bioimaging, Principle and Perspectives. In Near Infrared-Emitting Nanoparticles for Biomedical Applications; Benayas, A., Hemmer, E., Hong, G., Jaque, D., Eds.; Springer International Publishing: Cham, 2020; pp 163–197. https://doi.org/10.1007/978-3-030-32036-2_8.
(2)         Castaing, V.; Arroyo, E.; Becerro, A. I.; Ocaña, M.; Lozano, G.; Míguez, H. Persistent Luminescent Nanoparticles: Challenges and Opportunities for a Shimmering Future. Journal of Applied Physics 2021, 130 (8), 080902. https://doi.org/10.1063/5.0053283.
(3)         Castaing, V.; Sontakke, A. D.; Fernández-Carrión, A. J.; Touati, N.; Binet, L.; Allix, M.; Gourier, D.; Viana, B. Persistent Luminescence of ZnGa 2 O 4 :Cr 3+ Transparent Glass Ceramics: Effects of Excitation Wavelength and Excitation Power: Persistent Luminescence of ZnGa 2 O 4 :Cr 3+ Transparent Glass Ceramics: Effects of Excitation Wavelength and Excitation Power. Eur. J. Inorg. Chem. 2017, 2017 (44), 5114–5120. https://doi.org/10.1002/ejic.201700841.
(4)         Castaing, V.; Giordano, L.; Richard, C.; Gourier, D.; Allix, M.; Viana, B. Photochromism and Persistent Luminescence in Ni-Doped ZnGa 2 O 4 Transparent Glass-Ceramics: Toward Optical Memory Applications. J. Phys. Chem. C 2021, 125 (18), 10110–10120. https://doi.org/10.1021/acs.jpcc.1c01900.
(5)         Arroyo, E.; Medrán, B.; Castaing, V.; Lozano, G.; Ocaña, M.; Becerro, A. I. Persistent Luminescence of Transparent ZnGa 2 O 4 :Cr 3+ Thin Films from Colloidal Nanoparticles of Tunable Size. J. Mater. Chem. C 2021, 9 (13), 4474–4485. https://doi.org/10.1039/D1TC00258A.