Na2CO3-inducing YPO4:Eu phase transformation and related luminescence

Phosphate Ion-Driven BiPO4:Eu Phase Transition

“…Our previous works and the works of others also observed a phase switch in other crystal systems, such as YPO 4 , NaYF 4 , and NaGdF 4 . − For example, in YPO 4 and NaYF 4 systems, the phase transition between hexagonal and tetragonal, as well as cubic and hexagonal, respectively, occurred by adjusting the contents of Y 3+ and PO 4 3+ or F – ions. Actually, it could be attributed to the parameter changes involving a 1 and ν 2 of their respective eq .…”

“…By fixing the excitation and emission wavelengths at 395 and 595 nm, respectively, the luminescence decay curves of the 5 D 0 → 7 F 1 transition of Eu 3+ for the corresponding BiPO 4 :Eu samples are measured and normalized as presented on the logarithmic scale (Figures 8a,b and S2c, see the Supporting Information). Considering the difference of the lifetime in different crystal structures, 22 we The Journal of Physical Chemistry C respectively used the monoexponential and biexponential decay equations to fit the decay curves of the as-prepared samples within single-phase and two-phase mixtures. Average lifetime values for all cases are calculated and given beside their corresponding decay curves.…”

Formation and aspect ratio control of rhabdophane-type yttrium orthophosphate hexagonal prism particles synthesized by a citrate-assisted hydrothermal process

“…This inconsistency would be due to a small volume fraction of the particles. Hence, it is concluded that the rhab-YPO 4 particles are unlikely to be generated well in the absence of Na 3 -Cit (or other potential additives 5,[8][9][10][14][15][16][17]22 ) under the present reaction conditions.…”

“…Yttrium orthophosphate, YPO 4 , has been used as a host material for rare-earth-doped phosphors, YPO 4 :Ln 3+ , where Ln 3+ denotes rare-earth ions such as Eu 3+ , Tb 3+ , etc. 1–22 In addition to the ordinal photoluminescence (PL), up-conversion PL has been achieved by co-doping a pair of two or three appropriate Ln 3+ ions, such as Yb 3+ /Tb 3+ , Yb 3+ /Er 3+ , or Nd 3+ /Yb 3+ /Er 3+ pairs. 23–25 The PL properties also enable the YPO 4 :Ln 3+ particles to be applied in detection probes for arsenic, 26 temperature, 27 or pressure.…”

“…21 Using appropriate additives seems more effective to obtain rhab-YPO 4 in a hydrothermal system. The additives that have been reported are Na 2 CO 3 , 14,17 CTAB, 5,10,18 EDTA, 6,9 organic acids, 3,5,9,15,16,22,31 etc. Such additives were also effective in a solvothermal system using an EtOH/water mixture 2,11 or an ethylene glycol medium.…”