Cubic Y2O3 Phase Research Articles

Sequential two photon absorption induced optical limiting action of oxide upconverter based MoS2 heterostructures

Lanthanide ions (Yb, Er) doped cerium oxide (CeO2) and yttrium oxide (Y2O3) upconverter nanoparticles were prepared by sol-gel synthesis technique. And the upconverter nanoparticles (CeO2: Yb, Er and Y2O3: Yb, Er) were made us heterostructure with MoS2 by hydrothermal synthesis. XRD confirms the formation of cubic phase of CeO2, cubic phase of Y2O3, hexagonal phase of MoS2 and their coexistence in heterostructures. Further, the observation of characteristic Raman peaks between 400 and 700 cm−1 (Raman modes of CeO2, Y2O3) and 300–400 cm−1 (Raman modes of MoS2) assured the formation of heterostructures. FESEM exposes that in heterostructures nanospheres (CeO2: Yb, Er) and nanospindle (Y2O3: Yb, Er) were dispersed on MoS2 nanoplatelets. Furthermore, when forming the heterostructure with MoS2, the diameter of the CeO2 nanosphere got increased (90 nm) whereas, the length of the Y2O3 nanospindle was decreased (166 nm). The maximum absorption band occurred at UV region due to the charge transition from O2− to Ce ion or Y ion for CeO2 (340 nm) and Y2O3 (274 nm) respectively. Both upconverters exhibits interesting luminescence behaviour with green emission (537 nm, 588 nm), blue emission (497 nm) and red emission (621 nm). Nonlinear absorption induced optical limiting action were examined by open aperture Z-scan technique using nanosecond pulse laser. All the prepared nanoparticles exhibit a reverse saturable absorption pattern ascribed due to sequential two photon absorption. Among, all the samples, MoS2–CeO2: Yb, Er and MoS2–Y2O3: Yb, Er heterostructure possess a high nonlinear absorption coefficient (16.76 × 10−10 m/W, 13.61 × 10−10 m/W) and low limiting threshold (0.33 × 1012 W/m2, 0.51 × 1012 W/m2) due to the strong inter-band collision between of MoS2 and upconverters. The absorption of high number of photons and low limiting threshold behaviour make MoS2–CeO2: Yb, Er and MoS2–Y2O3: Yb, Er heterostructures as potential candidate for the fabrication of optical limiter based laser safety devices.

Solution combustion synthesized Y2O3 nanoparticles and influence of Dy doping on their microstructural, optical, and photoluminescence characteristics

AbstractDy‐doped Y2O3 nanoparticles were synthesized by solution combustion route with urea as fuel, and their microstructural features were analyzed by X‐ray diffraction (XRD) and high‐resolution transmission electron microscopy (HRTEM). The XRD study confirms the formation of a pure cubic phase of Y2O3, with the maximum textural coefficient along the (2 2 2) plane for the Dy‐doped samples. The lattice fringes in the HRTEM image and the bright spotty rings in the selected area electron diffraction (SAED) pattern reveal the highly crystalline nature of the nanoparticles. From the diffuse reflectance spectroscopy, using Kubelka‐Monk theory, the direct bandgap energy is estimated to be 5.61 eV for the undoped Y2O3, which is found to decrease upon Dy3+ doping. The room‐temperature excitation spectra of the nanoparticles recorded at 575 nm emission wavelength comprise several excitation bands corresponding to the f‐f transitions of Dy3+ ions in the host lattice. The photoluminescence spectra of the nanoparticles excited at the wavelength of 350 nm comprise three visible emission peaks at 477 nm (blue), 573 nm (yellow), and 666 nm (red). It has been concluded that the 0.5 mol% Dy‐doped Y2O3 nanoparticles are the potential candidate to be used for solid‐state luminescent device applications.

Phase diagram study and thermodynamic assessment of the Y2O3-YF3 system

The phase diagram of the Y2O3-YF3 system up to 1973 K was investigated using a classical equilibration/quenching experiment and differential thermal analysis (DTA). Equilibrium phases were confirmed by electron probe microanalysis (EPMA) and X-ray diffraction (XRD) phase analysis. For the very first time, the entire range of the phase diagram of yttrium oxy-fluoride system up to 1973 K was experimentally determined. Cubic-Y2O3 phase dissolves more than 5 mol% of YF3 at 1973 K. The melting points of YOF and vernier phases are found to be higher than 1973 K and their steep liquidus in the YF3-rich region are determined. Based on new experimental phase diagram data and thermodynamic property data in the literature, the Y2O3-YF3 system was thermodynamically modeled by the CALculation of PHAse Diagram (CALPHAD) method. As applications of the thermodynamic database, metastable solubilities of YF3 in Y2O3 during plasma etching process were calculated.

Europium-Doped Y2O3-Coated Diatomite Nanomaterials: Hydrothermal Synthesis, Characterization, Optical Study with Enhanced Photocatalytic Performance

Eu-doped Y2O3 coated diatomite nanostructures with variable Eu3+ contents were synthesized by a facile hydrothermal technique. The products were characterized by means of energy dispersive X-ray photoelectron spectroscopy (EDX), scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), Brunauer–Emmett–Teller (BET), UV-vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy techniques. As claimed by PXRD, the particles were crystallized excellently and attributed to the cubic phase of Y2O3. The influence of substitution of Eu3+ ions into Y2O3 lattice caused a redshift in the absorbance and a decrease in the bandgap of as-prepared coated compounds. The pore volume and BET specific surface area of Eu-doped Y2O3-coated diatomite is greater than uncoated biosilica. The sonophotocata-lytic activities of as-synthesized specimens were evaluated for the degradation of Reactive Blue 19. The effect of various specifications such as ultrasonic power, catalyst amount, and primary dye concentration was explored.

Modified Y2O3-coated biosilica with Dysprosium nanomaterials: synthesis, characterization, optical study with enhanced catalytic activity

Dy-doped Y2O3 coated biosilica nanostructures with variable Dy3+ contents were synthesized by a facile hydrothermal technique. The products were characterized by means of energy dispersive X-ray photoelectron spectroscopy (EDX), scanning electron microscopy (SEM), X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), UV-Vis diffuse reflectance spectroscopy, and photoluminescence spectroscopy techniques. As claimed by XRD, the particles were crystallized excellently and attributed to the cubic phase of Y2O3. The influence of substitution of Dy3+ ions into Y2O3 lattice caused a redshift in the absorbance and a decrease in the bandgap of as-prepared coated compounds. The pore volume and BET specific surface area of Dy-doped Y2O3 -coated diatomite is greater than uncoated biosilica. The sonophotocatalytic activities of as-synthesized specimens were evaluated for the degradation of Reactive Blue 19. The effect of various specifications like ultrasonic power, various scavenger, and catalyst amount was explored. The results revealed that diatomite coated with Dy3+-incorporated yttrium oxide nanoparticles can be utilized in various experimental cycles with no significant drop in photocatalytic activity.

Luminescence properties and cell uptake analysis of Y2O3:Eu, Bi nanophosphors for bio-imaging applications

A comparative investigation of nanostructural and photoluminescence properties (PL), functionalization, cytotoxicity and cell uptake of Y2O3:Eu3+,Bi3+ nanoparticles (NPs) fabricated by sol–gel (SG) and combustion synthesis (CS) is reported in this work. A detailed analysis by X-ray diffraction confirmed the formation of pure crystalline cubic phase of Y2O3 and transmission electron microscopy revealed the formation of spheroidal NPs by SG, while CS resulted in NPs with irregular morphology. The photoluminescence analysis of Y2O3: Eu3+,Bi3+ demonstrated red emission from Eu3+ upon near-UV excitation via energy transfer from Bi3+→Eu3+. The Y2O3:Eu3+, Bi3+ (4%, 0.1%) produced by SG approach presented the strongest red emission when excited under 254 and 330 nm excitation-wavelength with quantum yield value of 76% and 22% respectively. SG synthesized Y2O3:Eu3+, Bi3+ (4%, 0.1%) NPs were successfully functionalized with folic acid (FA) for cellular internalization. Cytotoxicity assay and flow cytometry studies of the FA functionalized Y2O3:Eu3+, Bi3+ (4%, 0.1%) NPs in various cancer cells showed good biocompatibility and cellular uptake. Our findings suggest the applicability of sol gel synthesized Y2O3:Eu3+, Bi3+ (4%, 0.1%) NPs for cancer cells bioimaging.

Structural and photoluminescence properties of Y2O3 and Y2O3:Ln3+ (Ln = Eu, Er, Ho) films synthesized by plasma electrolytic oxidation of yttrium substrate

Plasma electrolytic oxidation (PEO) of yttrium is performed for the first time and is shown that Y2O3 and trivalent rare-earth ions (Eu3+, Er3+ or Ho3+) doped Y2O3 films can be formed by PEO in alkaline electrolyte without or with addition of rare-earth oxide particles (Eu2O3, Er2O3 or Ho2O3), respectively. The elements present in PEO micro-discharges were identified using optical emission spectroscopy technique. The gas plasma temperature of (3000 ± 300) K was estimated from the intensity distribution within a part of an OH spectrum. The morphology, chemical composition, crystal structure, formation process and photoluminescence (PL) properties of formed films were investigated. Diffraction patterns of formed films show well pronounced reflections inherent to pure cubic phase of Y2O3. PL characterization of Y2O3 and Y2O3:Ln3+ (Ln = Eu, Er, Ho) films is performed through excitation and emission spectra. An intense red PL emission was observed from the Y2O3:Eu3+ and a green emission was observed from Y2O3:Er3+ and Y2O3:Ho3+ films.

Excitation power and Er3+ concentration effect on the color quality parameters in Y2O3:Er3+/Yb3+/Tm3+ nanophosphors

Y2O3 nanocrystalline phosphors doped with Er3 + / Yb3 + / Tm3 + ions were prepared using thermal decomposition technique at 500°C. Pure cubic phase of Y2O3 with an average crystallite size ∼29 ± 4 nm was determined from x-ray diffraction and high-resolution transmission electron microscope measurements. Their upconversion luminescence spectra were measured under 975-nm laser diode excitation at room temperature. A bright blue emission was simultaneously observed at 480 nm due to the G41 → H63 transition of Tm3 + ions, with the green (550 nm) and red (670 nm) emissions due to the H11/22, S3/24 → I15/24 and F9/24 → I15/24 transitions of Er3 + ions, respectively. Relative emission intensities of these colors were significantly affected by the Er3 + concentration as well as the excitation power density of 975-nm laser light. Color quality parameters and the color tuning abilities were determined from the Commission International de I’Echairage 1931 chromaticity diagram analysis, color rendering index, and their correlated color temperature values. A careful color tuning from cool to warm white light in Y2O3 : Er3 + / Yb3 + / Tm3 + phosphors was achieved by controlling both the doping concentration of Er3 + ions and the excitation power density of the 975-nm laser light.

Synthesis and properties of Y<SUB align="right">2O<SUB align="right">3:Eu<SUP align="right">3+</SUP> nanoflakes for security labels application using inkjet ink with electrohydrodynamic printing technique

Y2O3:Eu3+ nanoflakes are successfully synthesised by hydrothermal method with trisodium citrate as surfactant. The doping ratio of Eu3+ ion affects the luminescent intensity of the product. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and Raman spectroscopy are used for the characterisation of size, structure and morphology of the samples prepared at different conditions. The corresponding patterns of Y2O3:Eu3+ nanoflakes can be indexed to the cubic phase of Y2O3 (JCPDS 43-1036). The flake morphology of Y2O3:Eu3+ attains 98% when the molar ratio of citrate/yttrium is 0.6. Y2O3:Eu3+ nanoflakes have well-organised flake morphology with the average width around ~90-100 nm and the thickness around ~20 nm. The Y2O3:Eu3+ nanoflakes synthesised with 5-h reaction time are flower-like nanocrystals composed of numerous contorted nanoflakes linked together by edge-to-surface. The photoluminescence results show the strongest emissivity at wavelength of 618 nm due to 5D0→7F2 transition and the sample synthesised at 5-h hydrothermal reaction time has the best luminescent intensity. The crystallinity level, luminescent intensity and size of nanoparticles are elevated under annealing process. The ink for inkjet, containing synthesised Y2O3:Eu3+ nanoflakes, disperses in ethyl cellulose and other necessary solvents. The experimental security labels are printed by inkjet which uses electrohydrodynamic printing technique. The lines printed by inkjet device are solid and even, with the width at 138-170 µm in PET substrate and the smallest distance of two adjacent lines at 300 µm. The experiment security labels are nearly invisible under daylight and red under UV mercury lamps with wavelength of around 254 nm.

Effect of 6 MeV electrons on luminescence properties of Y2O3:Tb3+ nanophosphors

Y2O3:Tb3+ nanophosphors were synthesized by solution combustion technique and irradiated with 6MeV energetic electrons in the fluence range 2–10×1013e−cm−2. Powder X-ray diffraction (PXRD) patterns confirm cubic phase of Y2O3. The crystallite size was estimated using Scherrer method and was found to be in the order of ~39nm. SEM micrographs revealed the formation of non-uniform spherical shaped particles for higher electron fluence. Photoluminescence spectra (PL) of pristine and Tb3+ doped Y2O3 were recorded in the fluence range 2–10×1013e−cm−2. PL intensity was found to increase up to 4×1013e−cm−2 and thereafter it decreases with further increase in electron fluence. This may be attributed to lattice disorder produced by dense electronic excitation under electron irradiation. The characteristic emission peaks of Tb3+ were observed at ~ 484–490nm (5D4→7F6), 548nm (5D4→7F5) and 587nm (5D4→7F4) at excited wavelength 397nm. Two TL glow peaks were recorded in both pristine and electron irradiated samples indicate that two types of traps were created. The color co-ordinate values (x, y) were located in the green region of the CIE diagram suggests that electron irradiated Y2O3:Tb3+ phosphor could be used in white LEDs.

Ion beam induced luminescence studies of sol gel derived Y2O3:Dy3+ nanophosphors

Pure and Dy3+ doped Y2O3 are prepared by sol–gel technique. The samples are annealed at 900°C to obtain crystalline phase. X-ray diffraction (XRD) patterns confirm cubic phase of Y2O3. The crystallites size is calculated using Scherrer formula and is found to be in the order of 29.67nm. The particles are found to be spherical in nature and their sizes are estimated to be 35nm by scanning electron microscope (SEM) technique. Online ionoluminescence (IL) spectra of pure and Dy3+ doped Y2O3 are recorded with 100MeV Si8+ ions with fluence in the range 0.375–6.75×1013ionscm−2. Undoped samples do not show IL emission for any of the fluence explored. Four prominent IL emissions with peaks at 488, 670, 767nm and a prominent pair at 574 and 584nm are observed in Dy3+ doped samples. These characteristic emissions are attributed to luminescence centers activated by Dy3+ ions due to 4F9/2→6H15/2, 4F9/2→6H11/2,4F9/2→6H9/2+6H11/2 and 4F9/2→6H13/2 transitions respectively. Further, it is found that IL intensity at 574nm decays rapidly with ion fluence. A broad and weak photoluminescence (PL) emission with peak at ~485nm and a strong emission at 573nm are observed in ion irradiated Y2O3:Dy3+. It is found that PL intensity increases with ion fluence up to 3×1010ionscm−2 and then it decreases with further increase of ion fluence. This may be attributed to lattice disorder produced by dense electronic excitation under swift heavy ion irradiation.

Photoluminescence and Electroluminescence of Eu Doped Y2O3

In this paper, Eu doped Y2O3 nanophosphors are prepared at temperature 600oC by the combustion method. X-ray diffraction patterns confirm the formation of pure cubic phase of Y2O3. Electroluminescence of Eu doped Y2O3 has been investigated at different voltages by sandwitching the thick films between the conducting glass plate and aluminium electrode. Conducting transparent electrode has been obtained by depositing SnO2 layers over heated glass substrate. AC voltage of different frequencies was applied and EL intensity was measured with the help of photomultiplier tube. The intensity of EL increases with increasing voltage. PL decay characteristics of the Eu doped Y2O3 nanoparticles in the form of powder were measured.

Monodisperse and hollow structured Y2O3:Ln3+ (Ln = Eu, Dy, Er, Tm) nanospheres: A facile synthesis and multicolor-tunable luminescence properties

A novel, fast and simple method was developed to synthesize the undoped and lanthanide-doped yttrium oxide hollow nanospheres (Y2O3⋅HNSs) with multicolored downconversion emission under mild conditions by employing poly (acrylic acid sodium salt) microspheres (PAAS MSs) as active templates followed by a subsequent calcination process. The structure, morphology, formation process, and fluorescent properties are well investigated using various techniques. The results show that the samples can be well indexed to the pure cubic phase of Y2O3. The possible formation mechanism of the PAAS MSs, PAA-Y precursor, and Y2O3 HNSs are proposed and discussed in detail. Upon ultraviolet excitation, the obtained Y2O3:Ln3+ (Ln=Eu, Dy, Er, Tm) HNSs exhibit strong red, yellow–green, blue, yellow emission, respectively. Moreover, a novel single-phased and near-UV-pumped white-light-emitting phosphor Y2O3:Tm3+, Dy3+ was also successfully fabricated through optimizing the molar ratio among Tm3+ and Dy3+ in the Y2O3 host. This material may find potential applications in field-emission display devices and white ultraviolet light-emitting diodes (UV LEDs). Furthermore, this synthesis route may be of great significance in the preparation of other hollow spherical materials.

Facile preparation and fluorescence enhancement of yolk-like Ag@Y2O3:Yb3+,Tm3+ hollow structured composite

A yolk-like Ag@Y2O3:Yb3+,Tm3+ hollow structured composite was prepared through a layer-by-layer technique by coating a carbon layer on Ag seeds and further coating a Y2O3:Yb3+,Tm3+ layer, followed by a subsequent calcination process. The phase, morphology, structure, formation process, and up-conversion properties are well characterized by various techniques. XRD results show that all diffraction peaks of the products are consistent with standard values for the pure cubic phase of Y2O3 and cubic Ag. TEM images demonstrate that the interior space of the composite can be tuned by altering the thickness of the carbon layer. Moreover, the possible evolution mechanism from Ag cores to the final yolk-like structured composite is described. By doping the Yb3+ and Tm3+ ions into the Y2O3 host matrix, these particles show blue (1G4 → 3H6) and near infrared (3H4 → 3H6) emissions with different intensity depending on carbon layer thickness under 980 nm NIR laser excitation. Therefore, this material has potential for application in biomedical fields. In addition, the synthetic route may be of great value in the preparation of other hollow materials.

Influence of morphology and Yb3+ concentration on blue and red luminescence of uniform cube-like Y2O3:Yb3+/Tm3+ particles

Well-dispersed cube-like Y2O3:Yb3+/Tm3+ particles have been prepared via solvothermal route using carbon microspheres as template followed by a heat treatment. X-ray diffraction (XRD) results demonstrate that all the diffraction peaks of the samples can be well indexed to the pure cubic phase of Y2O3. SEM images reveal the existence of some rough pores on the surface of cubic Y2O3:Yb3+/Tm3+ particles. Intense blue emission (1G4 → 3H6) and weak red emission (1G4 → 3F4, 3F2,3 → 3H6) of Tm3+ were observed for the Yb3+ and Tm3+ co-doped Y2O3 particles under 975 nm infrared excitation. The results show that the integrated intensity of visible emission strongly depends on the uniform and well-dispersed morphology and the concentration of Yb3+ ions. Well-dispersed cube-like Y2O3:Yb3+/Tm3+ particles with rough surface can remarkably increase the blue and red emission intensity of Y2O3:Yb3+/Tm3+ particles, which might have potential application in the fields of infrared detection, advanced flat panel displays and biological fluorescent labeling.

Preparation and luminescent properties of hollow Y 2 O 3 :Tb 3+ microspheres

Y2O3:Tb3+ hollow microspheres have been successfully prepared on a large scale with polystyrene microspheres as templates followed by subsequent calcination. All X-ray diffraction peaks can be indexed to the pure cubic phase of Y2O3. Transmission electron microscopy and scanning electron microscopy images indicate that the average size of the hollow spheres is ca.1.3 µm and the thickness of the shells is ca. 50 nm. The microspheres show a strong green emission corresponding to the 5D4–7F5 transition of Tb3+ under ultraviolet excitation. The optimum Tb3+ concentration was 3 mol% to obtain the highest photoluminescence intensity. This study indicates that a calcining temperature of 800°C is needed for high luminescence efficiency.

Y2O3:Yb/Er nanotubes: Layer-by-layer assembly on carbon-nanotube templates and their upconversion luminescence properties

Well-shaped Y2O3:Yb/Er nanotubes have been successfully synthesized on a large scale via layer-by-layer (LBL) assembly on carbon nanotubes (CNTs) templates followed by a subsequent heat treatment process. The crystal structure, element analysis, morphology and upconversion luminescence properties were characterized. XRD results demonstrate that the diffraction peaks of the samples calcinated at 800°C or above can be indexed to the pure cubic phase of Y2O3. SEM images indicate that a large quantity of uniform and rough nanotubes with diameters of about 30–60nm can be observed. The as-prepared Y2O3:Yb/Er nanotubes show a strong red emission corresponding to the 4F9/2–4I15/2 transition of the Er3+ ions under excitation at 980nm, which have potential applications in such fields as nanoscale devices, molecular catalysts, nanobiotechnology, photonics and optoelectronics.

Effect of doping concentration and annealing temperature on luminescence properties of Y2O3:Eu3+ nanophosphor prepared by colloidal precipitation method

Eu3+ doped Y2O3 nanophosphors have been synthesized using the simple colloidal precipitation method. Doping of Eu3+ ions in host yttria lattice has been achieved through slow re-crystallization process under wet-chemical conditions followed by annealing at high temperatures (300–1400°C). The nanophosphors were characterized by using powder X-ray diffraction (XRD), thermogravimetric analysis (TGA), atomic force microscopy (AFM) and spectrofluorometer techniques. XRD analysis reveals formation of pure cubic phase of Y2O3 in samples annealed at 700°C or above. Further, the XRD data was successfully used to retrieve the crystallite size and size distribution from powder samples using the FW((1/5)/(4/5))M method. Crystallite size (11–50nm) extracted from XRD has been found to be consistent with AFM measurements. The PL emission spectra of nanophosphors show bright red emission at 612nm due to hypersensitive electric dipole (ED) 5D0–7F2 transition of Eu3+ ions in Y2O3 lattice. Further, photoluminescence studies indicate that optimum value of the Eu3+ to get best luminescence properties is 12at%. Surface conjugations of these nanophosphors with water soluble dextran biomolecules have also been performed. Surface conjugated rare earth nanophosphors have great potential for bio-applications.

General and facile method to fabricate uniform Y2O3:Ln3+ (Ln3+ = Eu3+, Tb3+) hollow microspheres using polystyrene spheres as templates

Well-dispersed, uniform Y2O3:Ln3+ (Ln3+ = Eu3+, Tb3+) hollow microspheres have been successfully prepared via a urea-assisted homogeneous precipitation method using polystyrene (PS) as templates, followed by a subsequent calcination process. X-Ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), photoluminescence (PL) spectra, and cathodoluminescence (CL) spectra were employed to characterize the samples. The results demonstrate that the samples can be well indexed to the pure cubic phase of Y2O3. The TEM and SEM images indicate that the shell of the uniform hollow spheres, whose diameter is about 2.1 μm, is composed of many uniform nanoparticles with diameters of around 20 nm. Upon ultraviolet (UV) and low-voltage electron beam excitation, the Y2O3:Ln3+ (Ln3+ = Eu3+, Tb3+) samples exhibit bright red (Eu3+, 5D0 → 7F2), and green (Tb3+, 5D4 → 7F5) luminescence. This material may find potential applications in light display systems, optoelectronic devices and drug delivery based on the uniform hollow structure, dimensions, and luminescence properties. Furthermore, this synthesis route may be of great significance in the preparation of other hollow spherical materials.

Synthesis and optical properties of Dy3+-doped Y2O3 nanoparticles

In the present study, nearly-uniform spherical-shaped dysprosium-doped cubic yttrium-oxide nanoparticles were prepared by using the urea homogeneous precipitation method. X-ray diffraction patterns of synthesized particles confirmed the formation of a pure cubic phase of Y2O3. The morphology and the elemental analysis measurements were carried out using a transmission electron microscope and a field-emission scanning electron microscope. The particles were observed to have average sizes of around 110 nm. In order to select the optimum concentration of the Dy3+ dopant in the samples, we measured the strongest yellow emission peak intensity due to the strong 4F9/2-6H13/2 transition (573 nm) as a function of the Dy-ion dopant concentration under a constant 349 nm excitation. The PL results showed that the strongest yellow emission at 573 nm occurred when the dopant concentration was about 1% in mol equivalent. Y2O3:Dy3+ phosphor can be used for applications in security printing, biolabel technology, lamps for illumination purposes, etc.