Excitation Of Phosphors Research Articles

A Novel Gd3+–Pb2+ Doped LiSrPO4 Phosphor for Phototherapy Lamp Applications

The phosphors LiSrPO4:Gd3+ and LiSrPO4:Gd3+, Pb2+ with different concentration of Gd3+ and Pb2+ were synthesized by combination of re-crystallization and modified solid state diffusion method. The synthesized phosphors were characterized using XRD, SEM and PL spectroscopies. The PL excitation spectra of LiSrPO4:Gd3+ phosphor exhibit peak at 275 nm due to the 8S7/2 →4IJ transition of Gd3+ ions and gave narrow UVB emission at 312 nm. The effect of Pb2+ ions on the PL properties of LiSrPO4:Gd3+have also been investigated. Upon the addition of Pb2+ ions, the excitation of phosphors shows broad peak with maximum at 247 nm, overlapping the Hg 253.7 nm line. This addition of Pb2+ ions improved the emission intensity of narrow band UVB i.e. 312 nm under the excitation of 247 nm. The phosphor could be good candidate as phototherapy lamp phosphor material.

An integrated first principles and experimental investigation of the relationship between structural rigidity and quantum efficiency in phosphors for solid state lighting

We outline an integrated approach for exploring novel near-UV excited phosphors. To test the hypothesis of whether high host structural rigidity results in phosphors with high quantum efficiency (Φ), we calculated the Debye temperatures (Θ) for 27 host materials using density functional theory calculations. We identified Eu2+-activated Ca7Mg(SiO4)4 and CaMg(SiO3)2 as having a relatively high Θ=601K and 665K, respectively, and predicted excitation energies of 3.18eV (337nm) and 3.29eV (377nm), respectively, both of which are in good agreement with the results of photoluminescence spectroscopy. However, the measured Φ for these two phosphors was < 30%, which indicates that Θ alone is not a sufficient condition for a high Φ. This work demonstrates the potential of combined first-principles calculations and experiments in the discovery and design of novel near-UV excited phosphors.

Prediction on Mn4+‐Doped Germanate Red Phosphor by Crystal Field Calculation on Basis of Exchange Charge Model: A Case Study on K2Ge4O9:Mn4+

Blue excitable red phosphor is the key component to improve the quality of lighting and display which is based on InGaN blue chips. Because of the potential in the area, Mn4+ red phosphors have recently got rising interests. However, most of them were found by trial and error. It remains very challenging to predict which kind of compound can stabilize Mn4+ and which wavelengths Mn4+ ions if they could survive in it will exhibit the excitation and emission at. Here, we first propose to use crystal field calculation on basis of exchange charge model to predict the energy levels of Mn4+ ion in germanate K2Ge4O9 since Mn4+ and Ge4+ are almost identical in size and charge, and the local field around Mn4+ will experience less distortion after substitution for Ge4+. The calculation shows the red emission peaking at 663 nm and the blue absorption of 4A2g (4F) → 4T2g (4F) in 450~470 nm, which matches better to blue chips than commercial phosphor 3.5MgO·0.5MgF2·GeO2:Mn4+. This inspires the synthesis of Mn‐doped K2Ge4O9, the optical properties of which confirm the existence of Mn4+ and consist with the prediction. Comparison between theoretical and experimental results implies that no obvious preference of Mn4+ substitution over two different types of octahedral germanium sites, Ge1 and Ge2. Consequent systematic explorations have been made on the effects of flux content, preparation temperature, Mn content, and holding time to find the ways to enhance the Mn4+ luminescence for promotion of practical application. The results reveal the optimal sample can be made under much mild optimal condition (850°C for 4 h in air) with a quantum yield of &gt;30% upon blue excitation of 460~470 nm. As temperature rises from 8 to 573 K, zero photon line (ZPL) emission redshifts along with gradual appearance of anti‐Stokes side phonon bands due to the enhanced interaction of Mn4+ with host. This work demonstrates it possible to find Mn4+ red phosphors by guide of crystal field calculation.

Optical characteristics of the rare-earth-ions-doped calcium chlorapatite phosphors prepared by using the solid–state reaction method

Rare-earth-ions-doped apatite-based phosphors for near ultra-violet excitation have been studied. Ca5(PO4)3Cl:Eu3+ and Ca5(PO4)3Cl:Sm3+ phosphors are synthesized by using the solid–state reaction method sintering at 1100 °C and 1300 °C, respectively. Optical properties of these phosphors are characterized by measuring the absorption, excitation, and emission spectra at room temperature. Strong red-orange emissions corresponding to the 5D0 → 7F0 transition of Eu3+ and the 4G5/2 → 6H7/2 transition of Sm3+ from the near ultra-violet excitation are observed. Ca5(PO4)3Cl:Eu3+ and Ca5(PO4)3Cl:Sm3+ are red-orange emitting phosphors and the difference in emission intensity as varying the sintering temperatures is observed in both phosphors.

Long-wave UVA radiation excited warm white-light emitting NaGdTiO4: Tm3+/Dy3+/Eu3+ ions tri-doped phosphors: Synthesis, energy transfer and color tunable properties

NaGdTiO4 (NGT) phosphors doped with different activator ions (Tm3+, Dy3+, and Eu3+) were synthesized by a conventional solid-state reaction method in an ambient atmosphere. These phosphors were characterized by scanning electron microscope images, transmission electron microscope images, X-ray diffraction patterns, Fourier transform infrared spectra, and photoluminescence spectra. All the samples were crystallized in an orthorhombic phase with a space group of Pbcm (57). In Tm3+/Dy3+ ions co-doped samples, white-light emission was observed under near-ultraviolet (NUV) excitation. In addition, the energy transfer between Tm3+ and Dy3+ ions was proved to be a resonant type via an electric dipole–dipole mechanism and the critical distance of energy transfer was calculated to be 19.91 Å. Furthermore, Tm3+/Dy3+/Eu3+ ions tri-doped NGT phosphors demonstrated warm white-light emission by appropriately tuning the activator content, based on the principle of energy transfer. These NUV wavelength excitable phosphors exhibit great potential as a single-phase full-color emitting phosphor for white light-emitting diode applications.

Near ultraviolet excited Eu^3+ doped Li_3Ba_2La_3(WO_4)_8 red phosphors for white light emitting diodes

Eu3+ doped Li3Ba2La3(WO4)8 red phosphors were synthesized by the solid state reaction method. A pure phase was confirmed by the X-ray diffraction pattern. Diffuse reflection spectra, photoluminescence spectra, decay curves, quantum yields, and temperature-dependence luminescence spectra were measured. The Eu3+ ions can substitute the La3+ ions completely without decreasing the emission intensity obviously and the quantum yields can keep at about 95%. The activation energy from the bottom of 5D0 level to the 5D0-charge transfer state crossover is 0.24eV. All the results indicate that the Eu3+ doped Li3Ba2La3(WO4)8 can serve as a near ultraviolet excited red phosphor for white light emitting diodes.

Effect of Eu2+ on the luminescence properties of Ba1.52−xZn0.2Li0.4SiO4:0.05Ce3+, 0.03Mn2+, xEu2+ phosphor

The Ba1.52−xZn0.2Li0.4SiO4:0.05Ce3+, 0.03Mn2+, xEu2+ phosphors are synthesized by a co-precipitation method. Luminescence properties and crystal structure of Ba1.52−xZn0.2Li0.4SiO4:0.05Ce3+, 0.03Mn2+, xEu2+ phosphors are investigated in this paper. Crystal phase, excitation and emission spectra of phosphors are analyzed by XRD and FL. Emission spectra of Ba1.52−xZn0.2Li0.4SiO4:0.05Ce3+, 0.03Mn2+, xEu2+ phosphor show three color bands with the peaks at about 400nm, 502nm and 600nm, respectively. CIE chromaticity coordinates calculated through corresponding emission spectra indicate that white light could be achieved by adjustment of the content of Ce3+, Mn2+ and Eu2+. An overlap of excitation spectra under various monitoring wavelengths demonstrates that three colors can be obtained simultaneously under near-UV excitation. Thus, Ba1.52−xZn0.2Li0.4SiO4:0.05Ce3+, 0.03Mn2+, xEu2+ can be considered as a potential candidate phosphor for near-UV white LED.

Laser excitation of red, green, blue and trichromatic white rare-earth phosphors for solid-state lighting applications

Phosphors for solid-state lighting, based on a number of different compositional schemes and driven by light from blue light-emitting diodes (LEDs) are widely used for lighting applications. The low efficiency of pump LEDs at high drive currents (droop effect) limits the amount of light produced by conventional LED and phosphor combination. Pumping with laser diodes (LDs) can circumvent this limitation. In this paper we report on the characterisation of individual and a mixture of KEu(WO4)2 (red), BaMg2Al16O27:Eu, Mn (green) and (Sr,Mg)2SiO4:Eu (blue) phosphors, excited by a CW-driven LD operating at 404nm. The activator ion in each of these phosphors is, respectively, Eu3+, Mn2+ and Eu2+. Characteristics of light produced with each phosphor, variations with incident light power and phosphor temperature as well as effects from phosphor ageing are described. Results of comparison between pumping with coherent and incoherent light at the same wavelength are also described.

Temperature measurements using YAG : Dy and YAG : Sm under diode laser excitation (405 nm)

Temperature-sensitive phosphors offer an option of accurate contactless temperature measurement. The method can be applied to a wide temperature range and up to more than 1500 K. In the current paper, phosphor thermometry based on four rare earths doped in YAG was studied. The standard excitation of thermographic phosphors is carried out with a Nd : YAG laser often at 355 or 266 nm. We examined the temperature dependent luminescence at an excitation wavelength of 405 nm. The excitation with visible blue light offers two main advantages: the excitation sources are rather cheap and they involve less safety issues. Accordingly, a variety of new application of such remote-thermometry would be possible. The results show that YAG : Dy and YAG : Sm may be well utilized for phosphor thermometry excited by a 405 nm diode laser.

Blue-green luminescence in Hg free excited Sr2P2O7:Tb3+ pyrophosphate phosphor for NUV excited LEDs

Tb3+ activated Sr2P2O7 phosphor was prepared by modified solid state diffusion technique at 700°C. The XRD pattern of Sr2P2O7 is in well argument with the standard ICDD File (24-1011) available. Surface morphology of the present phosphor has been studied by scanning electron microscope (SEM). In photoluminescence investigation, the excitation spectra of the phosphor extends from 200 to 400 nm gives optimum absorption at 352 nm, which is mercury free excitation and characteristics of NUV excited LED. Under the excitation of 352 nm, Sr2P2O7 doped with trivalent terbium ions produces weak blue emission between 400-500 nm owing to the 5D3 to the 7FJ transitions of Tb3+ and strong green emission in 500650 nm region of the visible spectrum due to the 4f-4f transitions from the 5D4 to 7FJ (J=6, 5, 4, 3) states of Tb3+. The entire study reveals that the present phosphor have promising applications in the lamp industry especially for solid state lighting (mercury free excited lamp phosphor) and NUV LEDs.

Organic fluorescent dyes supported on activated boron nitride: a promising blue light excited phosphors for high-performance white light-emitting diodes.

We report an effective and rare-earth free light conversion material synthesized via a facile fabrication route, in which organic fluorescent dyes, i.e. Rhodamine B (RhB) and fluorescein isothiocyanate (FITC) are embedded into activated boron nitride (αBN) to form a composite phosphor. The composite phosphor shows highly efficient Förster resonance energy transfer and greatly improved thermal stability, and can emit at broad visible wavelengths of 500–650 nm under the 466 nm blue-light excitation. By packaging of the composite phosphors and a blue light-emitting diode (LED) chip with transparent epoxy resin, white LED with excellent thermal conductivity, current stability and optical performance can be realized, i.e. a thermal conductivity of 0.36 W/mk, a Commission Internationale de 1'Eclairage color coordinates of (0.32, 0.34), and a luminous efficiency of 21.6 lm·W−1. Our research opens the door toward to the practical long-life organic fluorescent dyes-based white LEDs.

Color-tunableness of Er3+/Eu3+ co-doped BiOCl phosphors for near ultraviolet excitation

In this paper, Er3+/Eu3+ co-doped BiOCl phosphors are synthesized by the conventional solid state method at 500℃, which are characterized by XRD, SEM, absorption spectra, excitation spectra and emission spectra. XRD analysis indicates that the samples exhibit pure tetragonal phase BiOCl. In SEM pictures, the samples exhibit smooth plate-like particles. The absorption spectra indicate that Er3+/Eu3+ ion dopants result in an impurity energy level, and the excitation spectra show that the sample has excellent broadband near ultraviolet (NUV)-exciting ability, which is due to the electronic transitions of the BiOCl bandgap. Under at 380 nm excitation, the emission bands located at 410 nm (2H9/2→4I15/2), 525 nm (2H11/2→4I15/2), 554 nm (4S3/2→4I15/2), 673 nm (4F9/2→4I15/2) of Er3+ ions, and 581 nm (5D0→7F0), 594 nm (5D0→7F1), 622 nm (5D0→7F2), 653 nm (5D0→7F3), 699 nm (5D0→7F4) of Eu3+ ions can be observed, respectively. Moreover, contrary to most of the Er3+/Eu3+-activated phosphors, the Er3+/Eu3+ co-doped BiOCl phosphor shows the unique and effective emission of the violet (Er3+) and far-red (Eu3+), which results from the particular structure of BiOCl crystals. The tunability in color of emitted radiation has been visualized by using chromaticity diagram on changing the doping concentration. Results show that the Er3+/Eu3+ co-doped BiOCl is a promising phosphor for near UV white LEDs.

硅酸盐荧光粉焙烧中的加盖工艺对产物性能的影响

Sr2. 95 Si O5∶ 0. 05 Eu phosphors were synthesized by high temperature solid phase method,and the phosphor phase,excitation and emission spectra,particle size distribution,surface morphology were investigated with the help of X-ray diffraction,spectrometer,granulometer and scanning electron microscopy. The influence of crucible lid-covering technology on the performance of the product was analyzed. The results indicate that the luminous intensity of the samples increases with the increasing of the crucible close degree. Crucible with lid is of benefit to the product for high purity Sr3 Si O5phase. The particle size of the sample with crucible lid-covering is larger,but the size distribution is uniform.

Role of flux on morphology and luminescence properties of Sm3+ doped Y2SiO5 nanopowders for WLEDs

The study involves preparation of samarium doped Y2SiO5 (YSO) nano powders by solution combustion method using urea as a fuel for the first time. Effect of different fluxes on the crystallization behavior, morphology and photoluminescence (PL) properties of YSO:Sm3+ (1–9mol%) were investigated. The final product was characterized by Powder X-ray diffraction (PXRD), Scanning Electron Microscopy (SEM) and UV–Vis spectroscopy. The average crystallite size estimated by Debye–Scherer’s and Williamson–Hall plots were found to be in the range of 10–50nm. Samples calcined at 1100°C show pure monoclinic X1 phase; whereas, samples calcined at 1200 and 1300°C show pure X2 phase of YSO. Photoluminescence (PL) studies of Sm3+ (1–9mol%) doped YSO for near ultra violet (NUV) excitation (407nm) was studied in order to investigate the possibility of its use in white light emitting diode (WLED) applications. The emission spectra consists of intra 4f transitions of Sm3+, such as 4G5/2→6H5/2 (∼560nm), 4G5/2→6H7/2 (600–613nm), 4G5/2→6H9/2 (∼650nm), 4G5/2→6H11/2 (715nm) and 4G5/2→6H13/2 (763nm) respectively. The emission intensity of the phosphor was found to be enhancing after addition of fluxes. Further, the emission at 600–613nm show strong orange–red emission and can be applied to the orange–red emission of phosphor for near ultra violet excitation.

Crystallographic and Luminescent Characteristics of New Blue Phosphor (Sr,Ba)Al2Si3O4N4:Eu2+

Recently, nitrides and oxynitrides have received a great deal of attention as phosphor materials for white LED (WLED) lighting application, since these are thermally and mechanically stable owing to a strong lattice consisting of point-shared and/or edge-shared (Si,Al)(N,O)4tetrahedral network. In this paper, new oxynitride-based phosphor materials (Sr,Ba)Al2Si3O4N4:Eu2+ are proposed as the WLED phosphor for near-UV LED excitation. The crystal structure of SrAl2Si3O4N4 is monoclinic system and belongs to space group P21 (No.4) [1]. By using the single phase crystal samples, lattice parameters have been accurately determined as a = 7.2516(5) Å, b = 9.3434(5) Å, c = 10.8761(5) Å, β = 104.489(1)°, V = 713.45(7) Å3 [1]. The substructure in this crystal consists of (Si,Al)(N,O)4 tetrahedra and Sr2+ ions occupy the channel formed from its tetrahedrons. The crystallographic and luminescent characteristics are investigated for the (Sr,Ba)Al2Si3O4N4:Eu2+samples having different Ba content. The (Sr1-xBax)Al2Si3O4N4:Eu2+ phosphor samples were synthesized at 1400 ~ 1700 ¢ªC in N2 at atmospheric pressure for a few hours. SrCO3, BaCO3, Al2O3, Si3N4 and Eu2O3 were used as source materials. The Ba content x was varied from 0 to 1. In all xrange, almost the single crystal phase of the solid solution compound was obtained. Figure 1 shows the photoluminescence (PL) and PL excitation spectra of the SrAl2Si3O4N4:Eu2+ and Bal2Si3O4N4:Eu2+ [2]. The measurements were performed at room temperature under near UV excitation at 405 nm. Both samples show a broad blue luminescence attributed to the 4f65d to 4f7 internal transition in Eu2+ centers. The peak wavelength is 473 nm for the SrAl2Si3O4N4:Eu2+. The wavelength shifts to 465 nm by replacing Sr with Ba. The PL excitation bands lie in UV and near-UV region below 450 nm for both samples. The result indicates that (Sr,Ba)Al2Si3O4N4:Eu2+phosphors are a promising blue phosphor for WLED for near UV-LED excitation. Figure 2 shows dependences of the internal quantum efficiency (I.Q.E.) on the Ba content x. The I.Q.E. drastically increases with increasing x and reaches 0.90 at x = 0.5. The thermal quenching characteristics were investigated. In Fig. 2, the relative PL intensity measured at 200°C to that at 30°C (I200/I30) is shown. The relative intensity increases with increasing xas well as I.Q.E.. From the accurate determination of crystal structure analysis in these samples, it was found that the lattice structure changes from monoclinic to orthorhombic at around x of 0.25. Since the lattice symmetry of orthorhombic crystal is higher than that of monoclinic one, it is considered that the inherent lattice distortion is relaxed by the crystal phase transition, resulting in improvement of luminescent characteristics such as I.Q.E. and thermal quenching. In oxy-nitride materials, MSi2O2N2:Eu2+ (M = Ca, Sr, Ba) phosphor and have been investigated in detail on luminescent characteristics [3,4]. In the reference [3], it is reported that the efficiency of SrSi2O2N2:Eu2+ and BaSi2O2N2:Eu2+ is 91% and 76%, respectively. The crystal structure of Sr0.5Ba0.5Si2O2N2:Eu2+ was determined as triclinic with the space group P1(No.1) [5]. Additionally, the crystal structure of Ba(Si,Al)5(N,O)8 with space group A21ma(No.36) has been reported by W. B. Park et al.. [2] However, the systematic investigation regarding the relations between the space group and luminescent efficiency and thermal quenching characteristics have not been discussed yet. At the meeting, we will discuss the relation with considering the lattice distortion and/or defects, which may strongly affect the I.Q.E. and thermal quenching.

Infrared-to-visible up-conversion luminescence and energy transfer of RE3+/Yb3+(RE = Ho, Tm) co-doped SrIn2O4

Near-infrared excited up-conversion phosphors of RE3+/Yb3+(RE=Ho, Tm) co-doped SrIn2O4 were synthesized by a solid-state reaction method. X-ray diffraction analysis revealed the phase composition of those samples, and the up-conversion spectroscopic properties were studied in terms of up-conversion emission spectra. Under 980nm near-infrared laser excitation, strong green emission with the peak at 546nm was observed in SrIn2O4: Ho3+/Yb3+, which can be assigned to the characteristic 5S2(5F4)→5I8 transition of Ho3+. Furthermore, SrIn2O4: Tm3+/Yb3+ showed bright blue emission with the peak at 486nm, which is associated with the 1G4→3H6 transition of Tm3+. The UC power studies indicated that the luminescence of SrIn2O4: Ho3+/Yb3+ and SrIn2O4: Tm3+/Yb3+ are attributed to two-photon and three-photon process, respectively. The possible UC luminescence mechanism and energy transfer in SrIn2O4: RE3+/Yb3+ were discussed.

Spectral characteristics of nanoamorphous phosphors obtained by evaporation of Sr2Gd8(SiO4)6O2: Eu polycrystals

Amorphous nanophosphors have been obtained for the first time by pulsed electron beam evaporation of targets from bulk polycrystalline phosphors of the composition Sr2Gd8(SiO4)6O2: Eu with oxyapatite structure. The processes of crystallization of amorphous nanopowder were studied using differential scanning calorimetry and termogravimetry (40−1400°C). It was found that the Raman spectra of the samples are modified when the particles decrease from bulk to nanodimensional state. The spectral and luminescent characteristics of the phosphors in polycrystalline and nanoamorphous states have been examined. It was established that Eu3+ forms two types of optical centers. Unlike bulk phosphors, in the nanophosphors no Eu2+ ions are formed. The ratio of red to orange luminescence intensity for nanophosphors was found to increase as compared with bulk phosphors. This effect is due to disordering of nanoparticles. A resonant transfer of excitation energy from Gd3+ to Eu3+ ions was found in bulk and nanophosphors. Upon transition from polycrystalline to nanoamorphous state and laser excitation of phosphors, the luminescence intensity of Eu3+ ions increases approximately 10 times. This effect is explained in the framework of the configuration coordinates model.

Blue light excited Li6CaLa2M2O12:Eu3+ (M=Ta, Sb) red-emitting phosphors: structure and photoluminescence properties

A series of blue light excitable phosphors Li6CaLa2M2O12:xEu3+ (M=Ta, Sb; 0≤x≤0.6) were prepared by solid state reaction. Crystal structure, absorbance, photoluminescence excitation, emission and concentration dependence of Eu3+ luminescence were investigated. The exact spectral assignments can be performed by the analysis of the absorption spectra in combination with PLE spectra. The dominant red emission from 5D0-7F2 transition of Eu3+ can be effectively excited by 464nm (blue light), which matches well with GaN-based blue LED chips. The optimal concentration of Li6CaLa2Ta2O12:xEu3+ and Li6CaLa2Sb2O12:xEu3+ are 50mol% and 40mol%, respectively. The critical energy transfer distance between Eu3+ has also been calculated by the concentration quenching method. In addition, the Commission International del׳Eclairage (CIE) chromaticity coordinates of Li6CaLa2Ta2O12:0.5Eu3+ and Li6CaLa2Sb2O12:0.4Eu3+ phosphors are (0.65, 0.34) and (0.64, 0.35), respectively, which are very close to the standard of National Television System Committee (NTSC) (x=0.67, y=0.33).

Luminescent Properties of LuVO&lt;SUB&gt;4&lt;/SUB&gt;:Eu&lt;SUP&gt;3+&lt;/SUP&gt;,Bi&lt;SUP&gt;3+&lt;/SUP&gt; Red Phosphor for Light-Emitting Diodes

White light-emitting diodes have recently attracted great attention as promising candidates for next-generation lighting. The LuVO4:Eu3+,Bi3+ as new near-ultraviolet excited phosphors were synthesized via high-temperature solid-state reactions. The X-ray diffraction, excitation spectra, emission spectra and decay lifetimes of the phosphors were measured to characterize the structure and luminescent properties. With Bi3+ doping, the edge of excitation band corresponding to the Eu3+ emission shifts from 350 nm to 400 nm with the help of Bi(3+)-V5+ metal-metal charge transfer. Consequently, the phosphor exhibits efficient absorption of near-ultraviolet excitation, and it also exhibits excellent performance in emission intensity compared with the Y2O2S:Eu3+ phosphor in current use. This red-emitting material may be applied as a promising red phosphor for near-ultraviolet excited white light-emitting diodes.

Synthesis of a Broad-Band Excited and Multicolor Tunable Phosphor Gd2SiO5:Ce3+,Tb3+,Eu3+for Near-Ultraviolet Light-Emitting Diodes

Broad-band near-ultraviolet (NUV)-excited and multicolor-emitting Gd2SiO5:Ce3+,Tb3+,Eu3+ phosphors were synthesized by solid-state reaction. The emission color of the phosphors can be tuned from blue (0.153, 0.091) to green (0.325, 0.495) and eventually to red (0595, 0.370) through efficient Ce3+ → (Tb3+)n → Eu3+ energy transfer. NUV light was strongly absorbed by the Ce3+ ions, and the excited energy was transferred to Tb3+ ions, which produced intense green emission peaks. Finally, the excited energy was transferred from Tb3+ to Eu3+ ions, which is attributed to red emission peaks. These multicolor tunable Gd2SiO5:Ce3+,Tb3+,Eu3+ phosphors are promising materials for applications in NUV light-emitting diodes.