Improved photoluminescence in Eu3+ doped LaVO4 phosphor via co-doping of Li+/Ca2+ ions

Effect of Cr3+ doping on structural and optical properties of Eu3+ doped LaVO4 phosphor

“…This implies that all Eu 3+ and Cr 3+ co-doped LaVO 4 phosphors crystallize into monoclinic crystal structure belonging to P 2 1 / n space group. 32–34 No traces of any secondary phase in the XRD profile of these compounds are seen. The XRD patterns shift towards higher 2 θ value with the increase of concentration of Cr 3+ ion.…”

“…The charge transfer transition (CTS) of O 2− → Eu 3+ also lies in 270–325 nm range and overlaps on (VO 4 ) 3- bands. 17–19,32–34…”

“…The XRD measurements clearly show that the phosphor samples exist in monoclinic phase at this temperature. 25,27,28,32–34…”

Structural and luminescence studies of titanium co‐doped SrY2O4:Eu phosphors

“…This increment may be due to substitution of Ti 4+ ions at interstitial sites, as the ionic size of Ti 4+ (0.605) or Ti 3+ (0.67) ions is smaller than the ionic size of Y 3+ ion (0.947 Å). [ 25 ] According to the ionic radii concept, if Ti 4+ ions substitute at the Y 3+ ‐ion site then the unit cell volume of Ti 4+ ‐doped SrY 1.91 Eu 0.09 O 4 spinels must decrease. But this is not the case.…”

“…This increment may be due to substitution of Ti 4+ ions at interstitial sites, as the ionic size of Ti 4+ (0.605) or Ti 3+ (0.67) ions is smaller than the ionic size of Y 3+ ion (0.947 Å). [25] According to the ionic radii concept, if…”