High Efficient YVPO4 Luminescent Materials Activated by Europium

Abstract

YPO4:Eu, YVO4:Eu, and YVPO4:Eu based phosphors with various Eu(III) activator contents and phosphate-vanadate ratios were synthesized by the self-propagating high-temperature synthesis method. The samples were characterized by scanning electron microscopy, nitrogen sorption, acid-base indicators and photoluminescence. The particle surface features with a finely dispersed structure comprising all the involved elements. The pore structure and the specific surface areas of the samples were different depending on the compositions of the samples. The most finely dispersed sample was YVO4:Eu samples. The specific surface areas of the YPO4:Eu samples were 10 to 15 times greater than those of vanadate samples. The phosphors samples had a slightly basic (YVO4:Eu, YVPO4:Eu) or slightly acidic (YPO4:Eu) properties of the surface with different contents of Lewis and Brönsted sites. The differences in the compositions and acid-base state resulted in the difference in the intensity and brightness of the photoluminescence (PL) of the samples. The yttrium-phosphate-vanadate phosphors of the mixed YVxP1−xO4-Eu had higher brightness and PL intensity than those samples with similar phosphate as well as vanadate phosphors.

Emission Quenching and First Evidence of Tb3+-to-As5+ Charge Transfer in Terbium(III) Ion-Doped YVxAs1–xO4 Solid-State Solution

“…Minakova et al have shown that the peak related to the (220) plane was split. In this case, there could be indicated the existence of another crystal phase in the YV x As 1– x O 4 matrix . Therefore, an emergence of the double-exponential decay profile could be seen, when such a phenomenon occurs.…”

“…The decays present In this case, there could be indicated the existence of another crystal phase in the YV x As 1−x O 4 matrix. 36 Therefore, an emergence of the doubleexponential decay profile could be seen, when such a phenomenon occurs. The short time component can be associated with the Tb 3+ :YV x As 1−x O 4 phase in which Tb 3+ ions are nearby V 5+ ions as well as As 5+ ions.…”

Bismuth and Vanadium-Substituted Yttrium Phosphates for Cool Coating Applications

“…YPO 4 is considered as one of the best host material to prepare luminescent compounds, since they acquire high quantum efficiency and because of the existence of explicit absorption and emission spectral regions . High absorption and high vacuum stability during the radiation process in the ultraviolet (UV) domain make them as an efficient source of red light in normal and plasma display process . Eu 3+ -doped YPO 4 was reported to have the aforementioned quality; hence the possibility of using the material as a red light-emissive source was proposed by Chanchan and Singh .…”

“… 21 High absorption and high vacuum stability during the radiation process in the ultraviolet (UV) domain make them as an efficient source of red light in normal and plasma display process. 22 Eu 3+ -doped YPO 4 was reported to have the aforementioned quality; hence the possibility of using the material as a red light-emissive source was proposed by Chanchan and Singh. 21 Due to its high thermal expansion coefficient, it was explored as green barrier coatings to protect silicon ceramics.…”