Preparation and characterizations of Pr3+:CaF2 transparent ceramics with different doping concentrations

The effects of the solution reactant concentration and temperature on the preparation of Pr3+:BaF2 transparent ceramics

“…47 where α is the absorption coefficient, and N is the Pr 3+ doping concentration. The absorption cross-section of Pr 3+ in 5 at.% Pr 3+ :BaF 2 transparent ceramic is calculated to be 4.96 × 10 −21 cm 2 , which is less than the absorption crosssection value of 8.12 × 10 −21 cm 2 reported in Yi et al 48 of Pr:CaF 2 ceramics.…”

Enhancement of the photoluminescence modulation ratio in highly transparent KNN-based ceramics for optical information storage

“…In addition, there are several characteristic absorption peaks at 450 nm, 472 nm, 488 nm, 593 nm, 1432 nm, 1540 nm and 1960 nm, corresponding to the transitions from ground state level to 3 P 2 , 3 P 1 , 3 P 0 , 1 D 2 , 3 F 4 , 3 F 3 and 3 F 2 levels respectively. 32–34…”

“…In addition, there are several characteristic absorption peaks at 450 nm, 472 nm, 488 nm, 593 nm, 1432 nm, 1540 nm and 1960 nm, corresponding to the transitions from ground state level to 3 P 2 , 3 P 1 , 3 P 0 , 1 D 2 , 3 F 4 , 3 F 3 and 3 F 2 levels respectively. [32][33][34] Generally speaking, the larger the energy band gap (E g ), the higher the photon energy absorbed by the electron transition that is required, and the easier it is for the sample to become transparent in the visible region. 35 E g is calculated according to the Tauc equation (Fig.…”

D2h-Symmetric Tetratellurium Clusters in Silicate Glass as a Broadband NIR Light Source for Spectroscopy Applications

“…The average fluorescence lifetime τ is estimated as follows Here, A 1 and A 2 are the decay constants and τ 1 and τ 2 represent the long lifetime and short lifetime in the decay processes, respectively. 30 Upon excitation at 265 nm, the average fluorescence lifetimes for emissions at 730 and 535 nm are 37 and 51 μs, respectively, while the average fluorescence lifetimes are 20 and 14 μs for emissions at 535 and 430 nm under excitation at 315 nm, respectively. The great variation in lifetime excited by 265 and 315 nm indicates that the emissions at 730 and 430 nm originate from different types of Te centers.…”

“…All curves can be well fitted by double-exponential decay, suggesting that decay behaviors are related to multiple mechanisms. The average fluorescence lifetime τ is estimated as follows Here, A 1 and A 2 are the decay constants and τ 1 and τ 2 represent the long lifetime and short lifetime in the decay processes, respectively . Upon excitation at 265 nm, the average fluorescence lifetimes for emissions at 730 and 535 nm are 37 and 51 μs, respectively, while the average fluorescence lifetimes are 20 and 14 μs for emissions at 535 and 430 nm under excitation at 315 nm, respectively.…”