Luminescence properties of Ca2GdNbO6: Sm3+, Eu3+ red phosphors with high quantum yield and excellent thermal stability for WLEDs

A series of Ca₂GdNbO₆: xSm³⁺ (0.01 ≤ x ≤ 0.15) and Ca₂GdNbO₆: 0.03Sm³⁺, yEu³⁺ (0.05 ≤ y ≤ 0.3) phosphors were synthesized by the traditional solid-state sintering process. XRD and the corresponding refinement results indicate that both Sm³⁺ and Eu³⁺ ions are doped successfully into the lattice of Ca₂GdNbO₆. The micro-morphology shows that the elements of Ca₂GdNbO₆: 0.03Sm³⁺, 0.2Eu³⁺ phosphor are evenly distributed in the sample, and the particle size is about 2 μm. The optical properties and fluorescence lifetime of Ca₂GdNbO₆: 0.03Sm³⁺, Eu³⁺ phosphors were detailedly studied. The emission peak at ⁵D₀→⁷F₂ (614 nm) is the strongest and emits red light under 406 nm excitation. The increase of Eu³⁺ concentration causes the energy transfers from Sm³⁺ to Eu³⁺ ions, and the transfer efficiency reaches 28.6%. Ca₂GdNbO₆: 0.03Sm³⁺, 0.2Eu³⁺ phosphor has a quantum yield of about 82.7%, and thermal quenching activation energy is of 0.312 eV. The color coordinate (0.646, 0.352) of Ca₂GdNbO₆: 0.03Sm³⁺, 0.2Eu³⁺ phosphors is located in the red area. The LED device fabricated based on the above phosphor emit bright white light, and CCT = 5400 K, Ra = 92.8. The results present that Ca₂GdNbO₆: 0.03Sm³⁺, Eu³⁺ phosphors potentially find use in the future.     

White-light emission lead-free perovskite phosphor Cs2ZrCl6:Sb3+

Obtaining phosphors with white-light emission is a promising and economical approach for phosphor-conversion light emitting diodes (pc-LEDs), but traditional single-phase white light emission phosphors are inefficient. Here a white-light-emission phosphor was prepared via a co-precipitation method by doping Sb³⁺ into lead-free and vacancy-ordered double perovskite Cs₂ZrCl₆. X-ray diffraction, X-ray photoelectron spectroscopy, and formation energy calculations confirmed that Sb³⁺ ions replaced the Zr⁴⁺sites in the [ZrCl₆]^2? octahedron. The optical properties of Cs₂ZrCl₆:Sb³⁺ were investigated and compared with those of blank Cs₂ZrCl₆. The origination of the emission bands was determined according to their fluorescence spectra and decay-time at an approximate temperature of 4 K Sb³⁺-doped Cs₂ZrCl₆ exhibited white-light emission with double emission bands at 495 and 622 nm due to the ¹P₁ → ¹S₀ and ³P_{2, 1, 0} → ¹S₀ transitions of Sb³⁺, respectively. The intensity ratios of cyan light (495 nm) and the red light emission bands (622 nm) were tunable by adjusting the Sb³⁺concentration. The red component increased with increasing Sb³⁺ concentration in the present experimental range. Moreover, 10% Sb³⁺-doped Cs₂ZrCl₆ showed the strongest emission with a photoluminescence quantum yield of approximately 78% under excitation of 333-nm light White LED devices with different correlated color temperatures were achieved by combining 1% or 10% Sb³⁺-doped Cs₂ZrCl₆ with a 310-nm ultraviolet chip, suggesting that the synthesized samples have potential applications in white-illumination LEDs.     

LED-pumped intense red luminescence based on Ba2LaTaO6: Mn4+ double perovskite phosphor

Non-rare earth Mn⁴⁺ ion-doped red oxide phosphors have great potential for applications in warm white light-emitting diodes (wLEDs) due to their low cost and stable physicochemical properties. Herein, a series of Ba₂LaTaO₆ (BLTO): Mn⁴⁺ phosphors were successfully synthesized by the high-temperature solid-state method. The theoretical values of the band gap calculated by the density functional theory are close to the experimental values obtained by the absorption spectroscopy. In addition, the phosphors have a broad excitation band in the wavelength range of 280–550 nm and emit red light at the peak wavelength of 681 nm under excitation. The concentration quenching of the BLTO: Mn⁴⁺ phosphor was caused by dipole-dipole interactions. The activation energy and the average decay lifetimes of the samples were calculated. Meanwhile, the effects of synthesis temperature and Li⁺ ion doping on the luminescence performance of the samples were also investigated. Satisfactorily, the color purity and internal quantum efficiency of the phosphor reached 98.3% and 26.8%, respectively. Further, the samples were prepared as red-light components for warm wLEDs. The correlated color temperature, color rendering index, and luminous efficiency of the representative devices driven by 60 mA current were 5190 K, 83.3, and 81.59 lm/W, respectively. This work shows that the BLTO: Mn⁴⁺ red phosphor with excellent luminescence performance can be well applied to warm wLEDs.     

Preparation,crystal structure and luminescence properties of red-emitting Lu3Al5O12: Mn4+ ceramic phosphor

A series of red-emitting Mn⁴⁺ doped Lu₃Al₅O₁₂ (LuAG) ceramic phosphors were successfully prepared by a simple solid-state reaction method in a high-temperature muffle. MgO was co-doped as sintering aids and Mg²⁺ ions helped to realize the charge balance. The relations between the luminescence properties, crystal structures and the microstructures were well established. Results indicated that MgO promoted the densification of the ceramics as the specimens’ relative densities were up to 99%. Moreover, the substitution of Al³⁺ with Mg²⁺ have changed crystal structures and further affected the luminescent properties. Overall, the obtained ceramic phosphors showed strong red-light emission under excitation of ultraviolet and blue light. By optimizing the Mg²⁺ and Mn⁴⁺ concentration, a quantum efficiency (QE) as high as 47.8% can be achieved under the excitation of 460 nm light, indicating that the LuAG: Mn⁴⁺ ceramic phosphors are promising candidates for WLEDs applications.     

Luminescent properties of Na2GdMg2(VO4)3:Eu3+ red phosphors for NUV excited pc-WLEDs

Herein, a series of novel Na₂GdMg₂(VO₄)₃:Eu³⁺ (NGMVO:Eu³⁺) red phosphors were elaborated by conventional solid-state reaction process. Their structural features, luminescent properties, energy transfer were researched at length. XRD patterns indicate that NGMVO:Eu³⁺ crystallized in single cubic garnet structure. Under the excitation of near ultraviolet light at 356 nm, the emission spectra of NGMVO host could be divided in two parts that resulted from ³T₂ → ¹A₁ and ³T₁ → ¹A₁ transitions of VO₄^3?. While NGMVO:Eu³⁺ phosphors show intense sharp red emission peaks including 590, 610, 652 and 706 nm that originated from ⁵D₀ → ⁷F_J (J = 1–4) transitions of Eu³⁺, respectively. The optimal concentration of Eu³⁺ is 0.7. Importantly, NGMVO:0.7Eu³⁺ sample presents high energy transfer efficiency (89 %) and high external quantum efficiency (48.3 %). Besides, its emission intensity remains 79 % at 420 K compared with that at 300 K, proving the good thermal stability of phosphors. All above results suggest that NGMVO:Eu³⁺ red phosphors have latent applications in white light emitting diodes.     

Host sensitization of Mn4+ in self‐activated Na2WO2F4:Mn4+

Self‐activated compound serving as host sensitizer for trivalent rare‐earth ions has been intensively studied, but only in more recent years did it extend to non‐rare‐earth ions. In the present work, it is demonstrated for the first time that the parity‐forbidden Mn⁴⁺ red emission can be effectively enhanced by utilizing the strong parity‐allowed absorption of O^2?–W⁶⁺ charge transfer band and the energy transfer from “WO₂” groups to Mn⁴⁺ ions. Hopefully, the presently studied self‐activated Na₂WO₂F₄ can be developed as stable color converter for field‐emission displays.     

A novel extra-broadband visible-NIR phosphor doped with Ce3+ and Cr3+ towards multifunctional advanced applications

Phosphors that can emit broadband light from visible to near infrared (NIR) may have applications in the fields like white-light illumination and NIR vessel visualization, the investigation on single phase extra-broadband visible-NIR emitting phosphor is of great significance. Herein, an extra-broadband phosphor with tunable visible-NIR emission from 500 nm to longer than 900 nm (bandwidth >400 nm) was successfully prepared, which originates from the emission of Ce³⁺ (peaking at 573 nm), Cr³⁺ (peaking at 750 nm) and energy transfer from Ce³⁺ to Cr³⁺ in Y₃MgAl₃SiO₁₂ garnet. The influences of Ce³⁺/Cr³⁺ doping concentration and working temperature were discussed systematically by luminescence spectra and decay curves. A visible-NIR full-spectrum phosphor-converted light emitting diode (pc-LED) fabricated with a 460 nm LED chip and Y₃MgAl₃SiO₁₂:0.03Ce³⁺, 0.01Cr³⁺ can generate bright white light and broadband NIR light simultaneously. The co-doping of Ce³⁺ can perfectly compensate for the missing spectrum of Cr³⁺ in the visible region, thanks to the extra-broadband emission of Ce³⁺ in visible region and Cr³⁺ in NIR region, multifunctional advanced applications may be realized for the prepared phosphors.     

High luminescent thermal stability and water resistance of K2SiF6:Mn4+@CaF2 red emitting phosphor

K₂SiF₆:Mn⁴⁺ (KSF:Mn⁴⁺), as an efficient red-emitting phosphor, has a promising application in WLEDs (white light-emitting diodes). However, poor moisture resistance performance still hinders its deeper commercialization. Here, KSF:Mn⁴⁺@ CaF₂ with high water resistance and luminescent thermal stability has been prepared though H₂O₂-free hydrothermal method and surface coating process. Both KSF:Mn⁴⁺ and KSF:Mn⁴⁺@CaF₂ all have high luminescent thermal stability, due to negative thermal quenching (NTQ) effect. Mechanism of the NTQ has been discussed and suggested as thermal-light energy conversion mechanism. Compared with KSF:Mn⁴⁺, water resistance of KSF:Mn⁴⁺@CaF₂ is greatly improved by coating of CaF₂, because the outer shell of CaF₂ can effectively prevent the [MnF₆]^2- group on the surface of the phosphor from being hydrolyzed into MnO₂. The results of water resistance test shows that after immersing in water for 360 min (6 h), luminescent intensity of the uncoated product drops to 41.68% of the initial one, while that of the coated product remains to have 88.24% of its initial one. Warm white light with good luminescent performances (CCT = 3956 K and Ra = 89.3) is got from prototype WLEDs assembled by using the optimal coated sample. The results suggest that the optimal coated sample has potential application in blue-based warm WLEDs.     

Pr3+ doped Li2SrSiO4: an efficient visible-ultraviolet C up-conversion phosphor

Up-conversion (UC) phosphor converting visible light into ultraviolet C light (UVC) has potential application in many fields. However, the lower energy conversion efficiency limits its practical application. Here, we proven that the synthesized Li₂SrSiO₄:Pr³⁺ phosphor is an efficient UV phosphor with the emission power of 0.25 mW/cm² (0.1 mW/cm² for UVC band), which can effectively inactivate bacteria within 10 min. Based on the different propagation properties of visible light and UVC in ordinary glass, we proposed a scheme to coat this phosphor inside the slide and cover glass of a confocal microscope to realize the real-time observation of the response of microorganisms under UVC irradiation, thereby providing a new effective method for microbial research.     

A broadband yellow-emitting nitridoalumosilicate Ca4SiAl3N7:Ce3+ phosphor for solid-state lighting

Developing an efficient broadband yellow phosphor with more red-light components and small thermal quenching is of great significance for solid-state lighting. In this study, a broadband yellow-emitting nitridoalumosilicate Ca₄SiAl₃N₇:Ce³⁺ phosphor was successfully synthesized by a solid-phase method at comparatively low temperature (1350 °C) and normal pressure. The crystal structure and electronic structure of Ca₄SiAl₃N₇ were studied using Rietveld refinement and density functional theory. The photoluminescence properties of the Ca₄SiAl₃N₇:Ce³⁺ phosphor were studied, including excitation and emission spectra, time-resolved photoluminescence spectra and temperature-dependent emission spectra. The results show that the Ca₄SiAl₃N₇:Ce³⁺ phosphor can be effectively excited by the blue chip and emit a strong broadband yellow light with maximum at 568 nm and the half width of 142 nm. Moreover, the Ca₄SiAl₃N₇:Ce³⁺ phosphor exhibits good thermal stability, which can still maintain 75% and 68% of the strength at room temperature when at 150 °C and 200 °C, respectively, and without spectral shift. A warm WLED can be realized by combining Ca₄SiAl₃N₇:Ce³⁺ yellow phosphor and blue LED chip. This study provides insights into developing novel broadband yellow nitridoalumosilicate phosphor with more red-light components, small thermal quenching and simple synthesis conditions.     

A double-perovskite Sr2ZnWO6:Mn4+ deep red phosphor: Synthesis and luminescence properties

Novel double-perovskite Sr₂ZnWO₆:Mn⁴⁺(SZW:Mn⁴⁺) phosphor is synthesized by high-temperature solid-state reaction method in air. SZW:Mn⁴⁺ phosphor with excitation at 325 and 526 nm emits deep-red light, the chromaticity coordinate is (0.7315,0.2685), and the emission band peaking at ~702 nm within the range 640–760 nm is assigned to the ²E→⁴A₂ transition of Mn⁴⁺ ion. The influences of “Mn⁴⁺- ligand” bonding and crystal field strength to emission properties of Mn⁴⁺ ion are analyzed. The optimal Mn⁴⁺ ion concentration in SZW:Mn⁴⁺ phosphor is ~0.8 mol%. Lifetime of SZW:Mn⁴⁺ phosphor decreases from 554.77 to 401.35 μs with increasing Mn⁴⁺ ion concentration in the range of 0.2–1.0 mol%. The lifetime data and decay curves indicate that there is only a single type of Mn⁴⁺ ion luminescent center in SZW:Mn⁴⁺ phosphor. The luminous mechanism of SZW:Mn⁴⁺ phosphor is analyzed by Tanabe-Sugano energy level diagram of Mn⁴⁺ in the octahedron together with the simple energy level diagram. The experimental results are helpful to research the influences of the neighboring coordination environment around Mn⁴⁺ and host crystal structure to the luminescence properties of Mn⁴⁺ ion and to deeply understand other Mn⁴⁺-dopedmaterials.     

Rare-earth-free Li5La3Ta2O12:Mn4+ deep-red-emitting phosphor: Synthesis and photoluminescence properties

Li₅La₃Ta₂O₁₂:Mn⁴⁺ (LLTO:Mn⁴⁺) phosphors are prepared in air via high-temperature solid-state method and investigated for their crystal structures and luminescence properties. LLTO:Mn⁴⁺ phosphor under excitation at 314 nm shows deep-red emission peaking at 714 nm due to the ²E→⁴A₂ transition of Mn⁴⁺ ion. The excitation bands in the range 220 - 570 nm are attributed to the Mn⁴⁺ - O^2- charge-transfer band and the ⁴A_2g→⁴T_1g, ²T_2g, and ⁴T_2g transitions of Mn⁴⁺, respectively. The optimal Mn⁴⁺ ion concentration is ~0.4 mol%. The concentration quenching mechanism in LLTO:Mn⁴⁺ phosphor is electric dipole-dipole interaction. The luminous mechanism and temperature quenching phenomenon are explained by the Tanabe-Sugano energy level diagram and the configurational coordinate diagram of Mn⁴⁺ in the octahedron, respectively. The experimental results indicate that LLTO:Mn⁴⁺ phosphor has a potential application prospect as candidate of deep-red component in light-emitting diode (LED) lighting.     

Novel cyan-emitting KBaScSi2O7:Eu2+ phosphors with ultrahigh quantum efficiency and excellent thermal stability for WLEDs

Owing to the conventional phosphor-converted white LEDs (pc-WLEDs) generally suffer from blue-green cavity, thus, developing an appropriate phosphors covering both the blue and green regions in their emission spectra are very urgent. Herein, a novel Sc silicate phosphor, KBaScSi₂O₇:Eu²⁺ (KBSS:Eu²⁺), has been successfully designed and prepared via a solid-state reaction. The crystal structure, luminescent properties, thermal quenching, quantum efficiency as well as its application in UV-pumped WLEDs have been investigated systematically. The KBSS:Eu²⁺ phosphor exhibits a strong and broad excitation band ranging from 290 to 450 nm, and gives a sufficient cyan emission of 488 nm with a full-width half-maximum (FWHM) of 70 nm, which filled the blue-green cavity. Importantly, the optimized KBSS:Eu²⁺ phosphor possesses an ultrahigh quantum efficiency (QE) up to 91.3% and an excellent thermal stability retaining 90% at 423 K with respect to that measured at room temperature. Finally, the as-fabricated UV-based WLEDs device, with only coupled the mixture of KBSS:Eu²⁺ cyan phosphor and CaAlSiN₃:Eu²⁺ red ones to a commercial 365nm UV chip, exhibits a satisfactory color-rendering index (Ra = 88.6), correlated color temperature (CCT = 3770K), and luminous efficiency (LE = 21 lm/W).     

High luminescent brightness and thermal stability of red emitting Li3Ba2Y3(WO4)8:Eu3+ phosphor

A series of Li₃Ba₂Y_3−x(WO₄)₈:xEu³⁺ (x=0.1, 1, 1.5, 2 and 2.8) phosphors were synthesized by a high temperature solid-state reaction method. Under the excitation of near ultraviolet (NUV) light, the as-prepared phosphor exhibits intense red luminescence originating from the characteristic transitions of Eu³⁺ ions, which is 1.8 times as strong as the commercial Y₂O₂S:Eu³⁺ phosphor. The optimal doping concentration of Eu³⁺ ions here is confirmed as x=1.5. The electric dipole-quadrupole (D-Q) interaction is deduced to be responsible for concentration quenching of Eu³⁺ ions in the Li₃Ba₂Y₃(WO₄)₈ phosphor. The analysis of optical transition and Huang-Rhys factor reveals a weak electron-phonon coupling interaction. The temperature-dependent emission spectra also indicate that the as-prepared Li₃Ba₂Y₃(WO₄)₈:Eu³⁺ phosphor has better thermal stability than that of the commercial Y₂O₂S:Eu³⁺ phosphor. Therefore, our results show that the as-prepared Li₃Ba₂Y₃(WO₄)₈:Eu³⁺ phosphor is a promising candidate as red emitting component for white light emitting diodes (LEDs).     

Sensitive optical thermometer via efficient energy transfer in dual-emitting thermochromic YNbO4:Bi3+, Eu3+ phosphor

The remote and non-invasive optical thermometer exploiting fluorescence intensity ratio technology is of great importance in various intelligent optoelectronic sensors. Dual-emitting YNbO₄:Bi³⁺, Eu³⁺ phosphor is synthesized and investigated for the development of temperature sensing materials. The phosphor excited at 318 nm shows a blue broad band emission and several red sharp peaks. The value of Bi³⁺→Eu³⁺ energy transfer can reach 98.2% when Eu³⁺ doping content is 0.14. Benefiting from diverse thermal response behaviors due to Bi³⁺ and Eu³⁺ ions completely different electronic configurations, a dual-emitting optical thermometer is designed. The maximum values of absolute and relative sensitivities are as high as 2.51% K^?1 at 473 K and 1.43% K^?1 at 423 K, respectively. The thermochromic phosphor possesses a great chromaticity shift (ΔE = 317×10^?3) with temperature. Based on superior color discriminability, visual colorimetry temperature measurement relied on thermal characteristic is proposed. All the results demonstrate that YNbO₄:0.01Bi³⁺, 0.005Eu³⁺ phosphor as a sensitive and reliable optical thermometer has great potentials in temperature measurement.     

Insight into a concentration-sensitive red-emitting phosphor Li2Ca4Si4O13:Eu3+ for multifunctional applications: Crystal structure,electronic structure and luminescent properties

Lithium-containing silicate compounds have attracted so much attention in recent years for applications in energy storage and illumination source due to their rigid structure and good electrical conductivity. In this study, a Eu³⁺ doped lithium-containing silicate red phosphor, Li₂Ca₄Si₄O₁₃:Eu³⁺, was explored by using structural computational simulations and systematic experiments for multifunctional applications. As a result, due to the quite non-central symmetry of the Ca²⁺ sites (C₁ symmetry), the strong 4f-4f excitations in near ultraviolet region were observed. Under near ultraviolet and cathode ray light excitation, Li₂Ca₄Si₄O₁₃:Eu³⁺ phosphor has an efficient red emission with good thermal stability and ageing resistance. Furthermore, Li₂Ca₄Si₄O₁₃:Eu³⁺ phosphor exhibits a concentration-sensitive behavior induced by the change of site symmetry. The results show that it is feasible to develop near-ultraviolet and cathode ray light excited red phosphors in lithium-containing silicate compounds.     

Silica nanoparticles assisted preparation of reddish-yellow emitting Eu2+ activated remote-type CaSrSiO4 phosphor for warm white LED applications

A reddish-yellow emitting silicate-based remote phosphor has been developed via the wet-solid phase reaction technique. By employing silica nanoparticles (200 nm), Eu²⁺ doped CaSrSiO₄ phosphor was developed and its efficacy has been examined thoroughly. The developed remote phosphor can get excited over a broad region of the spectrum ranging from ultraviolet to blue (250–500 nm) and as generates a reddish-yellow emission peaked at 580 nm covering a broad range of spectral components (450–800 nm) with a quantum efficiency of 52%. The thermoluminescence studies of developed remote phosphor exhibit 50% of the stable emission up to 200 °C without any shift in the emission wavelength. The developed remote phosphor was then utilized for the making of a proto-type LED using 450 nm blue-emitting commercial LED. The output emission from the proto-type LED confirms the production of efficient warm white light with CCT <5000 K and CRI >85.     

Insight into a novel rare-earth-free red-emitting phosphor Li3Mg2NbO6:Mn4+: Structure and luminescence properties

Red phosphor is indispensable to achieve warm white light in the white light diode (WLED) application. However, the current red phosphors suffer from high cost and harsh synthesis conditions. In this study, an oxide-based rare-earth-free red-emitting phosphor Li₃Mg₂NbO₆:Mn⁴⁺ (LMN:Mn⁴⁺) has been successfully synthesized by a simple solid-state reaction method. The relationship between crystal structure and luminescence was investigated in detail. The site occupancy of the doping Mn⁴⁺ ion in the LMN host has been discussed from the point of bond valence sum. How the coordination environment of doping Mn⁴⁺ affects the energy level of doping Mn⁴⁺ ion has been illustrated via the Tanabe-Sugano energy-level diagram. Moreover, warm white light has been obtained using LMN:Mn⁴⁺ as compensator to the YAG:Ce³⁺.     

Novel double-perovskite Mg2InSbO6:Sm3+ phosphor with excellent heat-resistant performance and high color purity used in white LEDs

In this study, Sm³⁺-doped double-perovskite Mg₂InSbO₆ phosphors were synthesized via high-temperature solid-state reaction. Mg₂InSbO₆ belongs to the double-perovskite family with a space group of R (No.148). The photoluminescence (PL) spectrum illustrates that Mg₂InSbO₆:0.05Sm³⁺ phosphor can emit intense orange-red emission light at 607 nm due to the ⁴G_5/2→⁶H_7/2 transition. The optimum concentration of Mg₂InSbO₆:xSm³⁺ is confirmed to 0.05 mol. The asymmetric ratio (⁴G_5/2→⁶H_9/2/⁴G_5/2→⁶H_5/2) of Mg₂InSbO₆:0.05Sm³⁺ phosphor is 2.73. The quenching temperature exceeds 500 K, illustrating that Mg₂InSbO₆:Sm³⁺ sample has excellent heat resistance. The high color purity and correlated color temperature (CCT) of Mg₂InSbO₆:Sm³⁺ phosphors are obtained. Furthermore, a white light-emitting diode (w-LED) is successfully fabricated, possessing CCT of 6769 K and high color rendering index (R_a) of 89. Therefore, the orange-red-emitting Mg₂InSbO₆:Sm³⁺ phosphors exhibit great potential to apply in solid-state lighting fields.     

Tunable luminescence and energy transfer properties of MgY4Si3O13: Ce3+, Tb3+, Eu3+ phosphors

The tricolor-emitting MgY₄Si₃O₁₃: Ce³⁺, Tb³⁺, Eu³⁺ phosphors for ultraviolet-LED have been prepared via a high-temperature solid-state method. X-ray diffraction, photoluminescence emission, excitation spectra and fluorescence lifetime were utilized to characterize the structure and the properties of synthesized samples. Two different lattice sites for Ce³⁺ are occupied from the host structure and the normalized PL and PLE spectra. The emissions of single-doped Ce³⁺/Tb³⁺/Eu³⁺ are located in blue, green and red region, respectively. The energy transfer from Ce³⁺ to Tb³⁺ and from Tb³⁺ to Eu³⁺ has been validated by spectra and decay curves and the energy transfer mode from Tb³⁺ to Eu³⁺ was calculated to be electric dipole-dipole interactions. By adjusting the content of Tb³⁺ and Eu³⁺ in MgY₄Si₃O₁₃: Ce³⁺, Tb³⁺, Eu³⁺, the CIE coordinates can be changed from blue to green and eventually generate white light under UV excitation. All the results indicate that the MgY₄Si₃O₁₃: Ce³⁺, Tb³⁺, Eu³⁺ phosphors are potential candidates in the application of UV-WLEDs.