Temperature triggering a photon-avalanche-like mechanism in NdAl3(BO3)4 particles under excitation at 1064 nm

Santos, Emanuel P.; Maciel, Célio Vínicius Tomaz; Silva, Rodrigo Ferreira da; Luz, Daniel Ferreira da; Silva, Jefferson Ferreira da; Silva, Carlos Jacinto da; Maia, Lauro June Queiroz; Rego Filho, Francisco de Assis Martins Gomes; Moura, André de Lima

Temperature triggering a photon-avalanche-like mechanism in NdAl3(BO3)4 particles under excitation at 1064 nm

Data

2022

Autores

Santos, Emanuel P.

Maciel, Célio Vínicius Tomaz

Silva, Rodrigo Ferreira da

Luz, Daniel Ferreira da

Silva, Jefferson Ferreira da

Silva, Carlos Jacinto da

Maia, Lauro June Queiroz

Rego Filho, Francisco de Assis Martins Gomes

Moura, André de Lima

Resumo

Photon avalanche (PA) is a fascinating mechanism for exciting trivalent rare-earth ions (REI3+). It occurs when cross-relaxation mechanisms provide a non-zero population at a lower excited state. Then, photons that are nonresonant with ground-state transitions can be increasingly absorbed from this level. PA has been demonstrated with some REI3+-doped materials under specific excitation wavelengths and temperature regimes. Here the PA-like was observed on NdAl3(BO3)4 particles at some fixed temperature values (within 23 ◦C ≤ T ≤ 215 ◦C), while the excitation power was increased. In this study, the PA-like is associated to a cross-relaxation mechanism [ 4 F3/2, 4 I9/2] → [ 4 I15/2, 4 I15/2]. After multiphonon emissions, the population of Nd3+ ions at the 4 I11/2 state doubles at every iteration, a process followed by a resonant excited-state absorption ( 4 I11/2 → 4 F3/2). In this case, the excitation power threshold decreased threefold. In a second round of experiments, we demonstrate for the first time the triggering the PA-like mechanism by increasing the temperature (27 ◦C ≤ T < 35 ◦C) at a fixed excitation power (1064 nm, cw). We foresee applications of the present results in optical thermometry, hyperthermia treatments, super-resolution imaging, and the development of super-sensitive sensors.

Palavras-chave

Photon avalanche, Up-conversion, Trivalent neodymium ions

Citação

SANTOS, Emanuel P. et al. Temperature triggering a photon-avalanche-like mechanism in NdAl3(BO3)4 particles under excitation at 1064 nm. Journal of Luminescence, Amsterdam, v. 245, e118645, 2022. DOI: 10.1016/j.jlumin.2021.118645. Disponível em: https://www.sciencedirect.com/science/article/pii/S0022231321007614. Acesso em: 31 jan. 2024.