Y2O3 Phosphor Research Articles

Efficient Near-Infrared Quantum Cutting in Y2O3 co-doped with Ho3+, Yb3+ Phosphor for the Application in Solar Cell

Abstract: An efficient Near-Infrared Quantum Cutting has been demonstrated in Ho3+ and Yb3+ co-activated Y2O3 sample, synthesized by a complex based precursor solution method. The phosphors have been characterized by X-ray diffraction (XRD), Crystal structure photoluminescence (PL) and CIE Chromaticity analysis. The phosphor materials give efficient emission in the green region both through UC and PL, while efficient NIR emission is observed through the QC process. The Photoluminescence emission (PL) spectra of Y2O3 doped 1% Ho3+ x% Yb3+ (x= 0, 5, 10, 20, 30, and 50) samples, The cooperative energy transfers from one Ho3+ to two Yb3+, an intense NIR emission around 549 nm of Yb3+ 2F5/2 - 2F7/2 transition was obtained under 449 nm excitation. Near infrared photons (wavelength range 549 nm) emitted by an Yb3+ ion pair. The Properties of Y2O3 doped with Ho3+ and Yb3+ quantum-cutting phosphors are dependent on various factors such as dopant concentration, crystallinity, homogeneity, particle size. Effective control of the above parameters the quantum-cutting ability of the phosphor material. Small particle size of the quantum-cutting phosphor Y2O3:Ho3+, Yb3+ make it a suitable candidate for its application in solar cells.

Enhanced upconversion emission in Nd, Yb, Er and Ho tetra-doped Y2O3 phosphor

Yb3+, Nd3+, Er3+ and Ho3+ tetra ions doped Y2O3 upconversion phosphors have been prepared by the combustion route. Crystalline phase purity and cubic phase of prepared samples have been confirmed from powder X-ray diffraction study. Absorbance of samples over spectral range 200–1100 nm has been measured by diffuse reflectance spectroscopy. All samples exhibit large band gaps. Scanning electron micrograph analysis reveals spherical morphology of particles and sizes around 200 nm. Upconversion emission has been studied under a 980 nm diode laser excitation with 166 mW laser power. The Ho3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor show very high emission intensity of a green band centred at around 550 nm and another moderate intensity red band centred on 667 nm, while reverse is the case for Er3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor. Er3+, Ho3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor show enhanced high emission intensity in both green and red bands. These two bands are not visible in Nd3+ and Yb3+ co-doped Y2O3 phosphor but show weak upconversion emission at 549, 568 and 799 nm. Owing to the high emission intensity of green band, Ho3+, Nd3+ and Yb3+ co-doped Y2O3 phosphor may find potential applications in medical and security, while Er3+, Ho3+, Nd3+ and Yb3+ co-doped phosphor showing enhanced upconversion in green and red bands may find applications in white light generation.

Tuning the optical properties of Ln3+-doped-Y2O3@ZnO@Au core-shell heterostructures for visible-to-NIR photon harvesting

Here, compact Yb3+-Er3+-Tm3+ doped Y2O3 phosphor microspheres were synthesized by solvothermal method which gave emission in the entire visible region under 980 nm excitation. The effect of doping alkali ions like lithium on the upconversion emission of YYET phosphors is investigated. An epitaxial layer of ZnO is grown around the YYETL (Li+ doped YYET) microspheres by hydrothermal technique. An analysis of the influence of the ZnO shell thickness on the upconversion emission of core microspheres is done. Initial growth of a thin layer of ZnO on the YYETL microspheres causes enhancement in upconversion emission due to passivation of surface defects of core microspheres. Quenching of anti-Stokes emission occurs for thicker ZnO shell coating. Further, it is decorated with AuNPs to study the effect of plasmonics on the optical property of the developed heterostructure. The overlap between the upconversion emission spectra of core microspheres and the LSPR peak of AuNPs modulates the property of the entire structure. The optimized samples were checked for photocatalytic application by degradation of Rh6G dye under solar irradiation. YYETL@ZnO@Au core-shell samples exhibited highest rate constant of 0.00395 min−1, which is attributed to better exploitation of the UV–Vis-NIR region of the solar spectrum by all three components of the heterostructure.

Structure, luminescence properties and anti-thermal quenching of a novel Eu3+-activated red phosphor based on the negative thermal expansion material In0.5Sc1.5(MoO4)3

A new Eu3+-doped phosphor was synthesized by the high-temperature solid-state method based on In0.5Sc1.5(MoO4)3 with negative thermal expansion characteristics in the wide temperature range. The phosphor was pure phase, and the Eu3+ occupied the Sc3+-site. The main emission peak of the phosphor was located at 615 nm, which was attributed to the 5D0-7F2 energy level transition of Eu3+, and the fluorescence lifetime was between 297 and 493 μs. Its quenching concentration was 8 mol%, and the non-radiative energy transfer mechanism between Eu3+ ions was mainly exchange interaction. Under the excitation of 246 nm, the luminous intensity of phosphor was thermically enhanced after 348 K and showed near-zero thermal quenching characteristic. It could be attributed to the positive thermal expansion of phosphor change into two-dimensional negative thermal expansion. At 465 nm excitation, it also exhibited the anti- thermal quenching property and the luminous intensity remained 103.4 % at 423 K of that at the room temperature. The internal quantum efficiency of In0.5Sc1.5(MoO4)3: 8 mol% Eu3+ phosphor was 57.8 %, while the overall color purity was as high as 99.52 %. The LED device packaged it with a commercial LED chip could emit bright red light. Its comprehensive luminous properties were better than the commercial red phosphor Y2O3: Eu3+. The results showed that In0.5Sc1.5(MoO4)3: Eu3+ was a new red phosphor with good luminous performance and anti-thermal quenching characteristic.

A study on the impact of [BO33−], [PO43−] and [SO42−] ions in normal cubic structures via structural and photoluminescence properties of Y2O3:Eu3+ phosphors

A series of Y2O3-AG: Eu3+ (where AG = Anionic Groups [PO43−, SO42− and BO33−]) nanophosphors were synthesized via a chemical combustion method and their structural and photoluminescence properties were investigated. The crystal structure and the surface morphology studies were analysed through the X-Ray powder diffraction (XRPD), Field-emission scanning electron microscopy (FE-SEM), Fourier-transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS). The XRD results showed that undoped Y2O3 phosphors crystalized in a cubic crystal structure, while the Y2O3-AG phosphors transformed from the pure Y2O3 cubic structures, except for SO42− based phosphor materials. The SEM micrographs showed that the particles were formed in the micrometer range with different sizes and shapes. The FTIR spectra revealed the presence of various structural groups in the Y2O3, Y2O3-AG: Eu3+ phosphors. Moreover, the optical diffuse reflectance spectroscopy (DRS) and photoluminescence (PL) properties were investigated. Using the DRS data, the optical band gap energy values were obtained from the Kubelka-Munk function theory. Upon 395 nm excitation, the Y2O3-AG: Eu3+ phosphors emitted red light at 615 nm wavelength. Among all the samples, the Y2O3-BO3: Eu3+ produced the highest intensity of red-light emission. The International Commission on Illumination color coordinates indicated that these phosphors are potential candidates for producing enhanced red color components in white light-emitting diode (W-LEDs) applications.

Near-infrared photo-responsive Er3+-K+ co-doped Y2O3 phosphors with enhanced UC luminescence

Y2O3: x% Er3+ (x=5, 7, 10, 12, 15) and Y2O3: 10% Er3+，x% K+ (x=0, 1, 3, 5, 7, 10, 15) phosphors were successfully prepared by a low-temperature combustion method. The structure as well as the absorption/emission spectra of phosphors were investigated. The effect of doping concentration of K+ ions on the upconversion (UC) luminescence of Y2O3: 10% Er3+ phosphor was examined and the possible optical transitions were discussed. The results showed that K+ ion doping not only changed the microstructure and crystallinity of the phosphors, but also enhanced its UC luminescence intensity. The Y2O3: 10% Er3+, 7% K+ phosphor exhibit the strongest UC emission intensity. Compared with the Y2O3: 10% Er3+ phosphor, the UC luminescence intensity at 563 nm and 661 nm was enhanced by 67.8 and 27.3 times for the K-codoped samples, respectively. The phosphor with the optimal doping concentration was mixed with a polymer to form a composite film, which was employed for the fabrication of near-infrared (NIR) photo-responsive detection devices. The device exhibited strong photo-current response to NIR light at 980 nm, implying that our work could inspire new design strategy for the development of NIR photo-detection devices.

Nd3+ doped Y2O3 micro- and nanoparticles: A comparative study on temperature sensing and optical heating performance within the 1st biological window

In this work, Y2O3 phosphors doped with Nd3+ at two different concentrations (2% and 10%) were prepared by coconut water-assisted sol-gel method, at two different calcination temperatures (1000 °C and 1400 °C). Structure and morphology analyses were performed by XDR and SEM. Thermometric analyses were performed with 800 nm laser excitation, exploring the emission corresponding to the 4F3/2 – 4I9/2 transition from Nd3+ by the luminescence intensity ratio and valley-peak intensity ratio techniques. The results obtained indicate that the samples correspond to the cubic structure of Y2O3 of space group Ia3. SEM images reveal particles with an approximately spherical shape, with mean diameters of 41 ± 14 nm and 1.1 ± 0.4 μm for samples calcined at 1000 and 1400 °C, respectively. The thermometric characterization of these samples included the relative sensitivity, temperature uncertainty, repeatability, and reproducibility. Sensitivities of up to 0.46%.K−1 were obtained, with temperature uncertainties between 0.5 and 3.5 K over the entire temperature range analyzed (294–373K). Good repeatability and reproducibility were also obtained. Additional optical heating measurements indicated that the micrometric sample doped with 2% Nd3+ has a heating rate similar to the nanometric sample doped with 10% Nd3+. Among the investigated samples, the micrometric sample containing 2% Nd3+ presented the best potential for application as a multifunctional platform for heating and temperature sensing within the first biological window, as it offers high emission intensities, sensitivity, and heating rate.

A novel scheelite‐type LiCaGd(WO4)3:Eu3+ red phosphors with prominent thermal stability and high quantum efficiency

AbstractA series of LiCaGd(WO4)3: xEu3+ (0 ≤ x ≤ 1.0) red phosphors with tetragonal scheelite structure were synthesized via the conventional solid‐state reaction. Their crystal structure, photoluminescence excitation (PLE), and photoluminescence (PL) spectra, thermal stability and quantum efficiency were investigated. The phosphors exhibit a typical red light upon 395 nm near ultraviolet excitation, and the strongest emission peak at 617 nm is dominated by the 5D0→7F2 transition of Eu3+ ions. The PL intensity of the phosphors gradually increases with the increase of Eu3+ doping concentration, and the concentration quenching phenomenon is hardly observed. The quantum efficiency and the color purity of the phosphor reach maximum values of about 94.2 and 96.6% at x = 1.0, respectively. More importantly, LiCaGd(WO4)3:xEu3+ phosphors have prominent thermal stability. The temperature‐dependent PL intensity of the phosphors at 423 K is only reduced to 89.1% of the PL intensity at 303 K, which is superior to that of commercial red phosphors Y2O3:Eu3+. Finally, LiCaGd(WO4)3:Eu3+ phosphor is packaged with near ultraviolet InGaN chips to fabricate white light emitting diodes, which has a low color temperature (CCT = 4622 K) and a high color rendering index (CRI= 89.6).

Power dependent photoacoustic and photoluminescence studies on a Ho3+/Yb3+ doped Y2O3 phosphor.

The Ho3+/Yb3+ doped Y2O3 phosphor samples were synthesized through a combustion method and then were annealed at 800 °C, 1000 °C, and 1200 °C. The cubic phase of the synthesized samples was confirmed by XRD analysis. The upconversion (UC) & photoacoustic (PA) spectroscopic studies were done on prepared samples and both spectra are compared. The samples have shown intense green upconversion emission at 551 nm due to the 5S2 → 5I8 transition of Ho3+ ion along with other bands. The maximum emission intensity is obtained for the sample annealed at 1000 °C for 2 hours. The authors have also measured the lifetime corresponding to 5S2 → 5I8 transition and found that lifetime values follow the trend of upconversion intensity. The maximum lifetime of 224 μs is observed for the sample annealed at 1000 °C. A photoacoustic cell & a pre-amplifier was fabricated and optimized for maximum sensitivity of the system. The PA signal was found to increase with increase of excitation power within the studied range, while UC emission was found to saturate after a certain pump power. The increase in PA signal is due to the increase in non-radiative transitions in the sample. The wavelength-dependent photoacoustic spectrum of sample has shown absorption bands around 445, 536, 649 and 945 (970) nm with maximum absorption at 945 (970) nm. This indicates its potential for photo-thermal therapy using infrared excitation.

Size influence on optical thermometry of Er3+/Yb3+ Co-doped Y2O3 microspheres: From TCLs and Non-TCLs

Realization and optimization of enhanced/tunable optical luminescence properties is highly demanded for reliable and accurate temperature sensing. In this work, uniform monodisperse spherical Er3+/Yb3+ co-doped Y2O3 microcrystals of four different sizes have been synthesized via homogeneous precipitation by changing the reaction time, and the tuning of luminescence intensity/color was achieved by the controllable particles size. On this basis, by studying the particle size dependence of temperature sensing performance, we found that the behavior of absolute sensitivity (Sa) and relative sensitivity (Sr) have highly size dependence. Interestingly, when different FIR strategies were used (thermally coupled levels (TCLs) and nonthermally coupled levels (non-TCLs)), the sensitivity exhibits the opposite behavior. Importantly, when using the non-TCLs strategy, the maximum Sa value for the smallest phosphors was 1.084 K-1, leading to ∼246 times improvement compared to TCLs-based Sa. The ultrahigh Sa indicated that the Er3+/Yb3+ co-doped Y2O3 phosphors have potential in temperature detection, and the results are of guiding significance to studying the sensitivity of Y2O3 particle size-dependent temperature measurement.

Photoluminescence Property of Erbium-Doped Yttrium Oxide: Doping Concentration and Its Effect

Er3+ doped Y2O3 nanophosphors were synthesized by combustion techniques using urea as fuel, and their photoluminescence properties were measured. Furthermore, the morphology and particle size were calculated using Transmission electron microscopy (TEM), with the histogram showing the average particle size. Photoluminescence spectra of doped Y2O3:Er3+ phosphors were efficiently excited in the range of 200–400 nm. The phosphors prepared below 356 nm excitation exhibit three major peaks located at 506 nm (green) and 522 nm (green) and 711 nm (red) corresponding to 2H11/2 → 4I15/2 and 4F9/2 → 4I15/2 transition, respectively. The chromaticity calculation by the Commission Internationale de I’Eclairage (CIE) confirms that with Er3+ doping, the luminescence coordinates of Y2O3 phosphor with Er3+ doping shift to an almost white (0.291, 0.397) region which is very much close to the ideal white emission. Therefore, the prepared phosphor is used for UV-based LEDs and display devices.

Effects of Yb3+ concentration on up-conversion luminescence and temperature sensing characteristics of Tm3+/Yb3+:Y2O3 phosphors

Y2O3:0.5 mol%Tm3+/x mol%Yb3+(x = 3, 5, 7, 10) luminescent materials have been synthesized by the CO2 laser zone melting method. With 980 nm excitation, the up-conversion luminescence (UCL) emission bands corresponding to 1G4→3H6, 1G4→3F4, 3F2,3→3H6, and 3H4→3H6 transitions of Tm3+ ions were obtained in visible and near-infrared spectral regions, among which the luminescence emitted by 1G4→3H6, 3H4→3H6 transitions shows obvious Stark splitting. Besides, the optimal doping concentration of Yb3+ is 5 mol%. The up-conversion luminescence spectra of Y2O3:0.5 mol%Tm3+/5 mol%Yb3+ were recorded from 224 K to 873 K. The temperature sensing properties of 3F2,3 and 3H4, 1G4(a) and 1G4(b) energy levels of Tm3+ ions were investigated by the luminescence intensity ratio (LIR) method in a wide temperature range, and the possibility of using 3H4(a), 3H4(b) thermally coupled levels (TCLs) of Tm3+ ions for temperature sensing was developed. The results show that 1G4(a) and 1G4(b), 3F2,3 and 3H4, 3H4(a) and 3H4(b) of Tm3+ ions are TCLs, and the Stark sub-levels own relatively high absolute sensitivity at low temperature, whereas the 3F2,3 and 3H4 TCLs of Tm3+ ions are more suitable for high temperature measurement. The results show that the Tm3+/Yb3+:Y2O3 luminescent material can be a promising candidate for temperature sensing.

Peptide functionalized Dynabeads for the magnetic carrier separation of rare-earth fluorescent lamp phosphors

Novel separation processes for end of life fluorescent lamp phosphors could greatly contribute towards a more sustainable rare-earth element market. Furthermore, surface-binding peptides bound to magnetic carriers are a promising biotechnological tool for selective particle separation processes. In this work, we investigate the magnetic carrier separation of the three most common rare-earth fluorescent lamp phosphors, facilitated by Dynabeads functionalized with previously identified selectively surface-binding peptides. We present an active ester-mediated coupling to chemically immobilize the peptides on amine and carboxylic acid coated beads. We report on the impact of the peptide functionalization on the surface properties of the beads, based on zeta potential investigations of variously functionalized beads and a Raman spectroscopic structural study of the investigated peptides. Fluorometrically, we show that the phosphor removal strongly depends on the medium and the surface coating of the beads. Furthermore, the Raman spectroscopic evidence of various simultaneously present disulfide bond conformations indicates an equilibrium of multiple peptide conformations and/or the presence of intermolecular disulfide bonds. Moreover, we found that carboxylic acid coated Dynabeads have a high affinity for the red phosphor Y2O3:Eu3+and based on the determined isoelectric points we hypothesize that this is driven by electrostatic surface interactions. This work can contribute towards novel rare-earth phosphor separation processes and towards a better understanding of magnetic carrier separation processes facilitated by surface-binding peptides.

Gd3+ ion induced UV upconversion emission and temperature sensing in Tm3+/Yb3+:Y2O3 phosphor

Cubic phase Tm3+/Yb3+:Y2O3 and Tm3+/Yb3+/Gd3+:Y2O3 phosphors were prepared by low temperature combustion technique for upconversion emission in UV–visible range. The 980 nm excitation has generated UV emission at 314 nm in tridoped phosphor due to the energy transfer from Tm3+ to Gd3+ ion. Characteristic emission bands from Tm3+ are also observed in both the phosphors. Thermally coupled Stark sublevels 1G4(a) (476 nm) and 1G4(b) (488 nm) of Tm3+ ion were utilised for optical thermometry using fluorescent intensity ratio (FIR) method. The result shows that maximum absolute sensitivity in tridoped phosphor is observed to be 1.33 × 10−3 K−1 at 298 K. Moreover, temperature rise of phosphor at various pump power densities was also measured and it is estimated to achieve 407 K at the pump power density of 38.46 W/cm2.

Near-Infrared Light-Induced Photoresponse in Er3+/Li+-Codoped Y2O3/Poly(methyl methacrylate) Composite Film.

We demonstrate Li+-doping engineering for improving the near-infrared (NIR) photoresponse in an Er3+-activated Y2O3 phosphor. We show that the rational incorporation of Li+ results in a large enhancement of the upconversion (UC) emission intensity up to 29 times upon excitation of NIR light. The improved UC properties could be associated with the enhanced dipole-dipole transition probability due to Li+-induced changes in the local site symmetry for Er3+ ions and improvement in the crystallinity of the samples. We further demonstrate the construction of UC phosphor/polymer composite films by attaching the UC phosphor/polymer composite film onto a Si-photoresistor. The device shows a large enhancement of the photovoltage response from 0.16 to 0.4 V in Li-doped samples under NIR light illumination. These results suggest an effective doping strategy for the improvement of the UC performance of the oxide phosphor and its wide applications in solar energy utilization and NIR response devices.

Two-dimensional visualization of oxygen concentration field at high-temperature environment using phosphor Y2O3:Eu3+

In this study, a two-dimensional(2D) visualization of the oxygen concentration field in a high-temperature environment was achieved utilizing the phosphorescence of Y2O3:Eu3+. A temperature and oxygen concentration adjustable furnace was set up to study the oxygen concentration effect on the phosphorescence of Y2O3:Eu3+. Both the spectrum and decay time of phosphorescence of Y2O3:Eu3+ were found to have a direct relationship with the oxygen concentration. The spectral intensity of phosphorescence decreases as the oxygen concentration increases when the temperature exceeds 450 °C. The most sensitive peak is at its main peak at 612 nm, and its sensitivity increases with increasing temperature. For the same temperature, the sensing sensitivity decreases with the increase of the oxygen concentration is low. The decay time of phosphorescence begins to show sensitivity to oxygen concentration when the temperature exceeds 500 °C, and it decreases as the oxygen concentration increases. Similar to the intensity of the spectrum, for the same temperature, the most sensitivity is at low concentrations of oxygen. 2D oxygen concentration measurement was demonstrated in a fixed high-temperature environment, and measurements based on phosphorescence intensity (spectrum) and decay lifetime were demonstrated, showing the powerful application capability of oxygen concentration measurement at a high-temperature environment based on the phosphorescence of Y2O3:Eu3+.

Effects of Yb3+ Concentration on Up-Conversion Luminescence and Temperature Sensing Characteristics of Tm3+/Yb3+:Y2o3 Phosphor

Effects of Yb3+ Concentration on Up-Conversion Luminescence and Temperature Sensing Characteristics of Tm3+/Yb3+:Y2o3 Phosphor

Improved luminescence performance of Yb3+-Er3+-Zn2+: Y2O3 phosphor and its application to solar cells

Upconversion materials (UC) can convert low-energy photons into visible light and, therefore, can be incorporated in solar cells to increase the absorption of visible light. This study synthesized UC nanophosphors Yb3+, Er3+: Y2O3 and Yb3+, Er3+, Zn2+: Y2O3 by a simple co-precipitation method for application in dye-sensitized solar cells (DSSCs). The impact of the enhancement in the concentration of Zn2+ on the photoluminescence (PL) and color point of the synthesized nanophosphors was also investigated. The synthesized nanophosphors emitted intense red and weaker green emissions upon excitation at 980 nm. The incorporation of Zn2+ to the Yb3+, Er3+: Y2O3 nanophosphors leads to color tunability in the red and yellow regions. Furthermore, the synthesized nanophosphors were incorporated into the DSSC photoanode to form a TiO2-UC-based DSSC for converting near-infrared (NIR) into visible light. We observed that the TiO2-UC-based DSSC showed an enhancement ratio in current density and power conversion efficiency of 17.4% and 16.6%, respectively, compared to the bare TiO2-based DSSC. These results reveal that UC-based Yb3+, Er3+, Zn2+: Y2O3 nanophosphors are useful in improving the efficiency of DSSCs and in color tunability applications.

Optically thermometric sensitivities of Er3+/Yb3+ Co-doped hosts with different phonon energy

For Up-conversion (UC) optical thermometers based on luminescence intensity ratio (LIR) technology, the eternal pursuit is achieving high sensitivity to minimize its temperature measurement uncertainty, in which the selection strategy of matrix and dopants is one of the important factors. Phonon energy, as a basic property of matrix, greatly affects the temperature-dependent luminous intensity. Herein, Yb3+/Er3+ co-doped NaYF4 (NY), Y2O3 (YO), KLa(MoO4)2 (KLM), LaNbO4 (LN) and LaPO4 (LP) phosphors were used to be experimental objects because the phonon energy of them has distinct gradient. By comparing the sensitivities of Yb3+-Er3+ co-doped different matrices, it is found that the sensitivity is positively correlated with the matching degree (MD) between phonon energy and energy gap (ΔE) of thermal coupled levels (TCLs). This is because of the stronger mismatch between the energy gap and the effective phonon energy makes the non-radiative thermalization rates slower, thus affecting the rate of LIR change. The above conclusion gives a guidance method for selecting suitable matrix of high-sensitivity fluorescent thermometers.

Structural and optical characterizations of Ce3+ -doped YSO phosphors via the addition of TEOS.

In this work, Y2 O3 phosphors were synthesized utilizing facile sol-gel, combustion, and solid-state techniques. The tested synthesis processes provided various particle sizes from nano to submicron. To synthesize YSO:Ce3+ via a sol-gel method, tetraethylorthosilicate (TEOS) was used as the precursor for SiO2 . Crystal structure, microstructure, and optical behaviour of the synthesized nanostructured phosphors were studied using X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, Fourier transform-infrared (FT-IR) spectrometry, and photoluminescence (PL) analyses. FT-IR analysis showed that hydrolysis of TEOS gave rise to the generation of Si-O-Si asymmetrical stretching vibrations. Addition of specific amounts of TEOS resulted in the formation of Y2 SiO5 /Y2 Si2 O7 phosphors with different crystal structures. Upon excitation of the phosphors under 354nm radiation, there were two strong emission peaks at 395.6 and 424.1nm, attributed respectively to 5d-2 F5/2 and 5d-2 F7/2 electron transitions of Ce3+ . It was concluded that the most intense PL characteristics belonged to the combination of Y4.67 (SiO4 )3 O, Y2 Si2 O7 , and Y2 SiO5 phosphors.