Color tuning in thermally stable Sm³⁺-activated CaWO₄nanophosphors

Abstract

Sm3+ (Sm3+ = 2, 5, 7 and 10 at%) doped CaWO4 nanophosphors exhibit a wide range emission in blue, green and red regions of the visible spectrum.

Tunable Luminescence in Sr2MgSi2O7:Tb3+, Eu3+Phosphors Based on Energy Transfer

“…For investigating the concentration quenching mechanism, it is necessary to calculate the critical distance ( R c ) between Tb 3+ ions. According to concentration quenching theory, R c was determined by [21,22]: $Rc=2{false[\frac{3V}{4\mathrm{sans-serif\pi }{X}_{c}N}false]}^{\mathrm{1/3}}$ where V corresponds to the volume of unit cell, N is the number of host cations in the unit cell, and X c is the critical concentration of dopant ions. In this paper, V = 331.34 Å 3 , N = 2 and X c is 0.08 for Tb 3+ doped SMSO phosphor, as a consequence, R c was calculated to be 7.9 Å.…”

Structural refinement, Raman spectroscopy, optical and electrical properties of (Ba1−xSrx)MoO4 ceramics

“…These electronic properties are related to the presence of order-disorder and/ or distortion at medium range into tetragonal lattice [20]. Depending on the nature of the substituted ions into tetragonal lattice in the host matrix of scheelite materials enhances the intensity of PL spectra and shift towards the shorter wavelength region at room temperature [21,22]. The existence of localized energy levels in between conduction and valence band has a significant effect on the values of the band gap [23].…”

Effect of annealing on the structural, optical and emissive properties of SrWO4:Ln3+ (Dy3+, Eu3+ and Sm3+) nanoparticles

“…Inorganic hosts such as strontium tungstates (SrWO 4 ) have been well known for a long time for its strong visible luminescence in blue and green region at room temperature under UV excitation. Due to its higher thermal and chemical properties, it can be conveniently activated with rare earth ions in order to develop active media for solid state lasers [9] and phosphors technologies [10][11][12].…”