Hydrothermal synthesis and luminescence of CaMO4:RE3+ (M=W, Mo; RE=Eu, Tb) submicro-phosphors

Preparation and luminescence property of Sm‐doped ZnWO4 powders and films with wet chemical methods

“…2) the ZnWO 4 with a monoclinic sanmartinite structure was the main phase of the Sm-doped ZnWO 4 powders. The peak at ~28.60° was identified as the samarium tungstates, and also belong to that of sanmartinite, ZnWO 4 , as believed in some papers [20][21][22]. The XRD peaks were obviously lower for Smdoped ZnWO 4 powders than for the ZnWO 4 powders although a higher calcining temperature was used, indicating that the crystal growth was inhibited and the crystallinity was decreased by the Sm substitution.…”

Rare earth based nanostructured materials: synthesis, functionalization, properties and bioimaging and biosensing applications

“…Donors range from complex anion groups of the matrix such as vanadate, molybdate and wolframate groups, to individual lanthanide ions such as Ce 3+ , Gd 3+ and Bi 3+ , and also interesting in this context is the well-known O 2− to Eu 3+ charge transfer process, which is widely used to significantly increase the intensity of the Eu 3+ emissions. The ET from different anion groups of the matrix, such as vanadate [201], molybdate [202] and wolframate [203] groups, are among the most efficient ways of sensitizing the active lanthanide ions and obtaining optimum luminescence. As an example, a scheme showing the ET mechanism from the molybdate group to the Eu 3+ ion is shown in Figure 4A.…”

Preparation of red-emitting phosphors [K0.8Y0.65Eu3+0.08][Mo0.2W0.8O4] and calculation of Eu3+ 5D0 quantum efficiency

“…Here A 0-J is the experimental coefficients of spontaneous emissions, A 0-1 is the Einstein's coefficient of spontaneous emission between the 5 D 0 and 7 F 1 energy levels, which can be determined as approximately 50 s −1 and as a reference to calculate the value of other A 0-J [23][24][25]. So the quantum efficiency of Eu 3+ 5 D 0 energy level can be expressed by…”