Enhanced upconversion and downshifting emissions from Tm3+, Yb3+ co-doped CaZrO3 phosphor in the presence of alkali ions (Li+, Na+ and K+)

摘要: Abstract The Tm3+, Yb3+ co-doped CaZrO3 phosphor samples have been synthesized through solid state reaction method in the absence and presence of alkali metal ions (i.e. Li+, Na+, K+). X-ray diffraction (XRD) study shows formation crystal with orthorhombic phase. emits intense upconversion emission blue (474 nm) NIR (799 nm) regions due to 1G4 → 3H6 3H4 transitions Tm3+ ions, respectively on excitation 980 nm radiation. intensity is significantly enhanced charge compensation asymmetry field. case Na+ maximum at 1 W pump power, it increased by ∼44 ∼31 times regions, as compared without phosphor. downshifting region has observed oxygen vacancy 277 360 nm radiations which ions. Thus, this material suitable for white light emitting phosphors.