Investigation of defect related photoluminescence property of multicolour emitting Gd₂O₃:Dy³⁺phosphor

White‐Light and Yellow/Blue Photoluminescence Emission Based on Dy3+‐Doped SiO2–Gd2O3 Composites

“…The band located at 230 nm, is assigned to the host absorption, associated with the transition between the valence band to the conduction band in Gd 2 O 3 . The bands observed at approximately 255, 275, and 311 nm are associated to the electronic transitions from the energy level 8 S 7/2 to the excited levels 6 D J , 6 I J , and 6 P J , respectively, all belonging to Gd 3+ .…”

“…. The most intense band, at 230 nm, is assigned in the literature to the host absorption, associated to the transition from valence to the conduction band in Gd 2 O 3 . The weak absorption band at 275 nm is associated to the transition from state 8 S 7/2 to the excited state 6 I J of Gd 3+ …”

“…Dy 3+ is highlighted due to its peculiar emission in the yellow region, which makes it applicable for LED systems, photocatalysis, and lasers in liquid or crystal medium . Its yellow emission is attributed to the 4 F 9/2 → 6 H 13/2 transition, favored when Dy 3+ is located in a symmetry site without inversion center, thus is sensitive to the host matrix in which Dy 3+ is located . Dy 3+ still presents emissions on blue and red regions, and according the host in which Dy 3+ is allocated and the doping amounts, an ideal combination with yellow emission can generate white light.…”

Influence of Al3+ on the cross relaxation process and electrical properties of Dy3+ activated Gd2O3 phosphor for white LED application

“…where λ is the wavelength of the X-ray used, β is the full width at half maximum (FWHM) of XRD peak and θ is Bragg's angle [17]. The increase in D value with the annealing temperature of the phosphor shows the improved crystallinity.…”

Multispectral Emissions of Lanthanide-Doped Gadolinium Oxide Nanophosphors for Cathodoluminescence and Near-Infrared Upconversion/Downconversion Imaging

“…The imaging by NIR and CL are also conducted to obtain emissive images of nanoparticles. The use of gadolinium oxide (Gd 2 O 3 ) as a host material instead of Y 2 O 3 is interesting because it has intrinsic magnetic properties, which permits the expansion of potential applications using magnetic resonance imaging (MRI) [37,38,39]. Gadolinium ions possess seven unpaired electrons, which accelerate the proton relaxation in MRI, a result of which is T 1 contrast enhancement.…”