White light-emitting diode daubed via CaSc2O4:Ho3+/Yb3+ nanocrystal sheets enclosed using SiO2

Abstract

Our investigation assesses the downshifting (DS), periodicity up-transmutation as well as internal light consistency from phosphor samples of CaSc₂O₄ incorporated with Ho³⁺/Yb³⁺ along with up-conversion from CaY₂O₄ incorporated with Ho³⁺/Yb³⁺. These samples are created via precursor antecedent compound technique. The generation for the crystalline samples having orthorhombic stage is validated by the X-ray powder diffraction. The dispersal reflectance spectra exhibit several lines within the zones of ultraviolet–visible–near infrared (UV-vis-NIR), resulting from the ions of Ho³⁺ as well as Yb³⁺. The optical band gap (Eg) results reach 5.69 and 5.58 eV, corresponding to CaSc₂O₄:Ho³⁺/Yb³⁺ and CaY₂O₄:Ho³⁺/Yb³⁺. The CaSc₂O₄:Ho³⁺/Yb³⁺ samples exhibit potent downshifting discharge in green hue when excited under 454 nm. CaSc₂O₄:Ho³⁺/Yb³⁺, as well as CaY₂O₄:Ho³⁺/Yb³⁺, exhibit potent discharges in green hue as well as near-infrared up-transmutation discharges in faint blue and red hues when excited under 980 nm. The spectrum hue clarity -S_gr – for CaSc₂O₄:Ho³⁺(1%)/Yb³⁺(5%) reaches 0.78. The disparity in pumping force yields internal light consistency for said sample with the green discharge, being nonexistent in the CaY₂O₄:Ho³⁺(1%)/Yb³⁺(5%) sample. As such, CaSc₂O₄:Ho³⁺/Yb³⁺ may prove useful when applied to up-transmutation apparatuses.