Energy transfer efficiency in YF3 nanocrystals: Quantifying the Yb3+ to Tm3+ infrared dynamics

Abstract

In this work, we report on the determination of the infrared

Advances in the theoretical understanding of photon upconversion in rare-earth activated nanophosphors

“…By using rate equations of multi-steps energy transfer, Quintanilla et al 104 analyzed Yb 3+ -Yb 3+ and Yb 3+ -Tm 3+ energy transfer in nanoparticles of YF 3 co-doped with Yb 3+…”

“…By using rate equations of multi-steps energy transfer, Quintanilla et al 104 analyzed Yb 3+ -Yb 3+ and Yb 3+ -Tm 3+ energy transfer in nanoparticles of YF 3 co-doped with Yb 3+ and Tm 3+ . It is shown that the spectroscopic parameters involved, such as emission and absorption rates, remain unaltered when the material size is reduced in certain scales.…”

Structural and optical properties in Tm3+/Tm3+–Yb3+ doped NaLuF4 glass‐ceramics

“…Moreover, the overall intensity is lower. This effect could be attributed to energy migration among Yb 3+ ions due to the higher concentration, to energy back transfer from Tm 3+ to Yb 3+ and/or to energy transfer to quencher centers 49 …”

“…This effect could be attributed to energy migration among Yb 3+ ions due to the higher concentration, to energy back transfer from Tm 3+ to Yb 3+ and/or to energy transfer to quencher centers. 49 The UC processes involved in the population of the relevant emitting states of Tm 3+ ion are depicted in Figure 9. Firstly, the Yb 3+ ion at the ground state was excited to the 2 F 5/2 state by absorbing one 975 nm photon and then transferred the energy to Tm 3+ ions in the ground state following the mechanism 2 46 To obtain information about the processes involved in the UC emission after 975 nm excitation, the UC emission spectra have been obtained at different pump power densities.…”