Temperature dependence of 3P0 Pr3+ fluorescence dynamics in Y4Al2O9 crystals

Abstract

Temperature-dependent emission spectra and fluorescence dynamics profiles have been investigated in Pr 3? :Y 4 Al 2 O 9 crystals in order to better understand the processes responsible for quenching of the praseodymium 3 P 0 emissions. The cross-relaxation transfer rates were experimentally determined as a function of temperature. Using the rate equations formalism, the dynamics of the observed emissions were modeled. Basing on comparison between the measured and calculated decays, the energy transfer rates between Pr 3? ions were evaluated. The role of the backward process in explanation of the complicated character of 3 P 0 decays and its temperature dependence, especially its unexpectedly slow decaying component, were established.

Luminescence Nanothermometry Based on Pr3+ : LaF3 Single Core and Pr3+ : LaF3/LaF3 Core/Shell Nanoparticles

“…For the Pr 3+ ions, the energy gap between 3 P 0 and the next-highest state, 3 P 1 , is only a few hundred cm − 1 for most host matrices. 3 P 1 becomes thermally populated following 3 P 0 excitation, and the luminescence spectrum contains both 3 P 0 and 3 P 1 emissions, with intensity ratios consistent with the predicted Boltzmann distribution among these states [22,[32][33][34]. e work [26] demonstrates the applicability of 5d⟶4f luminescence with the intra-f 2 transitions of Pr 3 covering a wide temperature range (10-1000 K).…”

Scintillation properties of μPD-grown Y4Al2O9:Pr (YAM:Pr) crystals

“…the RE 4 Al 2 O 9 monoclinics [16], has received much less attention so far [17][18][19][20][21]. To the best of our knowledge, scintillation properties of RE 4 Al 2 O 9 :Pr have not been investigated yet.…”

“…To the best of our knowledge, scintillation properties of RE 4 Al 2 O 9 :Pr have not been investigated yet. Although there are real problems with the growth by the Czochralski method (there is a phase transition around 1300°C, which causes lattice tensions and thereby crystals crack while cooling down), the newer alternative growth techniques like the sol-gel synthesis [18] or the micro-pulling-down (lPD) [19] have successfully been utilized to obtain Y 4 Al 2 O 9 :Pr (YAM:Pr) crystals. In this paper we present the http://dx.doi.org/10.1016/j.jallcom.2015.01.274 0925-8388/Ó 2015 Elsevier B.V. All rights reserved.…”

Physical Background for Luminescence Thermometry Sensors Based on Pr3+:LaF3 Crystalline Particles

“…For example, the active-core/active-shell Nd 3+ /Yb 3+ -doped LaF 3 NPs demonstrate relative thermal sensitivity around 0.41 ± 0.01% ⋅ ∘ C −1 , at 10 ∘ C [9,11]. The systems based on Pr 3+ are studied in [19][20][21]. In case of Pr 3+ ions, the energy gap between 3 P 0 and the next-highest state, 3 P 1 , is only a few hundred cm −1 for most host matrixes (for example, for LaF 3 [22] and CsCdBr 3 [22] it is around 500 cm −1 ), 3 P 1 becomes thermally populated following 3 P 0 excitation, and the luminescence spectrum contains both 3 P 0 and 3 P 1 emission, with intensity ratios consistent with the predicted Boltzmann distribution among these states [22].…”