As-obtained Phosphors Research Articles

Unlocking Cr3+-Cr3+ Coupling in Spinel: Ultrabroadband Near-Infrared Emission beyond 900 nm with High Efficiency and Thermal Stability.

Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) hold promising potential as next-generation compact, portable, and intelligent NIR light sources. Nonetheless, the lack of high-performance broadband NIR phosphors with an emission peak beyond 900 nm has severely hindered the development and widespread application of NIR pc-LEDs. This study presents a strategy for precise control of energy-state coupling in spinel solid solutions composed of MgxZn1-xGa2O4 to tune the NIR emissions of Cr3+ activators. By combining crystal field engineering and heavy doping, the Cr3+-Cr3+ ion pair emission from the 4T2 state is unlocked, giving rise to unusual broadband NIR emission spanning 650 and 1400 nm with an emission maximum of 913 nm and a full width at half-maximum (fwhm) of 213 nm. Under an optimal Mg/Zn ratio of 4:1, the sample achieves record-breaking performance, including high internal and external quantum efficiency (IQE = 83.9% and EQE = 35.7%) and excellent thermal stability (I423K/I298K = 75.8%). Encapsulating the as-obtained phosphors into prototype pc-LEDs yields an overwhelming NIR output power of 124.2 mW at a driving current of 840 mA and a photoelectric conversion efficiency (PCE) of 10.5% at 30 mA, rendering high performance in NIR imaging applications.

Thermally stable broadband near-infrared emitting pyrochlore oxide phosphors codoped with Cr3+ and Yb3+ ions

The advance of portable and smart near-infrared (NIR) light sources has sparked significant interest. However, achieving high-performance NIR emission at longer wavelengths remains a formidable challenge. In this study, we prepared broadband NIR phosphors by codoping pyrochlore oxide Y2GaSbO7 (YGSO) with Cr3+ and Yb3+ ions using a conventional high-temperature solid-state reaction. Upon excitation by blue light, YGSO: 0.03Cr3+ exhibited a broadband NIR emission centered at 765 nm with a full width at half maximum (FWHM) of 160 nm. The purposeful incorporation of Yb3+ ions facilitated efficient energy transfer from Cr3+ to Yb3+, resulting in a newly observed NIR emission peak at 970 nm. Notably, the addition of Yb3+ improved the overall thermal quenching resistance owing to its inherent thermal stability. Furthermore, we encapsulated the as-obtained phosphors with commercial blue LED chips to create prototype phosphor-converted light-emitting diodes (pc-LEDs). The Cr3+ and Cr3+-Yb3+ codoped pc-LEDs achieved output powers of 120 mW@660 mA with a photoelectric conversion efficiency of 12.66%@30 mA, and 131.7 mW@1020 mA with a photoelectric conversion efficiency of 13.93%@30 mA, respectively. These broadband NIR pc-LEDs hold promise for optical imaging applications.

Li+ Ion Doping Induced Photoluminescence Enhancement and Anti-Thermal Quenching of LaOBr: Eu3+ Phosphor

Thermal quenching (TQ) seriously restricts the practical applications of phosphor-converted white-lighting-emitting diodes (pc-WLEDs), especially for high-power operations. Here, a novel red-emitting phosphor LaOBr: Eu3+ with layered tetragonal structure was successfully synthesized by a solid-state reaction approach. Due to additional Li+ ion doping into LaOBr: Eu3+, the as-obtained phosphors manifest excellent performance with high internal quenching efficiency (IQE) (58.6%) and anti-thermal quenching performance. It is demonstrated that the structural rigidity of the lattice matrix could be enhanced with the introduction of Li+ ions and, then, it contributes to the suppression of TQ and the improvement of the luminescence efficiency. Furthermore, a fabricated WLED based on the LaOBr: Eu3+, Li+ sample displays an appropriate color rendering index (CRI = 83.1) and correlated color temperature (CCT = 4719 K), revealing the great potential of the as-obtained red phosphor for pc-WLEDs.

Stable Multimode Luminescence Performances of SrGa12O19: Sm3+, Tb3+ Phosphor for Anti-Counterfeiting Application

Fluorescence materials have been widely employed for anti-counterfeiting techniques owing to their high-throughput, facile identification, and simplicity of production. However, the stability of the materials is a prerequisite for their subsequent application. Here, a series of SrGa12O19: Sm3+, Tb3+ phosphors with multi-color luminescence are obtained successfully by the traditional solid-state method. These Sm3+/Tb3+ co-doped phosphors emit green, orange and yellow-green under the excitation of 254 nm, 365 nm, and 254 nm+365 nm UV lamps, respectively. After removal of the UV lamp, the green long persistent luminescence (LPL) phenomenon is exhibited and then vanished 15 s later. The dynamic PL and LPL are associated with the interaction between PL and trapping centers. Notably, as-obtained phosphors show excellent stability against both air water resistance, and high temperature, which features the as-obtained phosphors a great application potential in high-level anti-counterfeiting with high stability.

General and facile synthesis, formation process, and luminescence properties of well-defined rare earth oxides hollow spheres

Uniform and well-defined Ln2O3 (Ln = Gd and Lu) hollow spheres have been fabricated via a hard template directed method with 3-aminophenol-formaldehyde (AF) resin as a template. During the synthesis procedure, the core-shell structured AF@Ln(OH)CO3 precursor spheres are firstly obtained via a homogeneous precipitation method. The final Ln2O3 hollow spheres are synthesized by a subsequent calcination treatment, which inherit the uniformity, dispersity, and morphology of the precursors and exhibit a reduction in diameter. The crystal structure, morphology, and formation process of the hollow spherical products have been systematically studied. After incorporating the proper lanthanide activator ions such as Eu3+, Yb3+/Er3+, or Yb3+/Ho3+ ions into the Gd2O3 and Lu2O3 host spheres, the as-synthesized luminescent hollow spheres can exhibit the characteristic downshift and upconversion emissions from different activator ions. The LED devices fabricated by the Gd2O3:Eu3+ and Lu2O3:Eu3+ phosphors and LED chip can show dazzling red emission light, which directly proves that the as-obtained phosphors may have prospects in fields of optoelectronic devices. Furthermore, the facile and general strategy may pave a critical way for the preparation of the hollow spherical rare earth oxides with well-defined structure and eminent physicochemical properties.

Enhanced luminescence efficiency and thermal stability via introduction of non-rare earth Bi3+ in Gd5Si2BO13:Eu3+

A series of Gd5Si2BO13:Eu3+ and non-rare earth Bi3+ ions doped Gd5Si2BO13:Eu3+ phosphors was successfully synthesized via high-temperature solid-state method, and the as-obtained phosphors were studied on their phase structures, luminescence characteristics, thermal stability and luminescence lifetime. Transient fluorescence spectroscopy data show that the addition of Bi3+ can obviously enhance the emission intensity of Eu3+ in the near-ultraviolet band owing to energy transfer from Bi3+ to Eu3+. Besides, the addition of Bi3+ can improve the thermal stability of a single-doped phosphor Gd5Si2BO13:0.35Eu3+ from 70.33% to 87.45% at 150 °C and the quantum yield from 58.80% to 78.61% at room temperature. Finally, Gd5Si2BO13:Eu3+,Bi3+ was used to encapsulate white light-emitting diodes (WLEDs) with green ((Ba,Sr)2SiO4:Eu2+) and blue (BaMgAl10O17:Eu2+) commercial phosphors. The color rendering index of WLEDs was calculated to be larger than 90, and the color temperature was estimated to be 4300–4500 K, which demonstrate that Gd5Si2BO13:Eu3+,Bi3+ can be regarded as a red phosphor with great potential application. This paper can provide a new insight into design of high-efficiency phosphors by introducing non-rare earth Bi3+ ions via energy transfer from Bi3+ to Eu3+.

A potentially multifunctional double-perovskite Sr2ScTaO6:Mn4+, Eu3+ phosphor for optical temperature sensing and indoor plant growth lighting

Recently, Mn4+-doped phosphors have attracted widespread attention in the field of indoor plant growth lighting on account of their strong far-red emitting properties. As a new type of dual-activator sensing system to further enhance the accuracy of temperature measurement, Mn4+ and Eu3+ ion co-doped double perovskite phosphors can simultaneously meet high temperature relative sensitivity and excellent signal discrimination ability for optical temperature sensing. In this work, a series of Sr2ScTaO6 phosphors singly doped with Mn4+, and co-doped with Mn4+/Eu3+ were synthesized. And the Mn4+-doping causes the spectra of the as-prepared phosphors to partially overlap with the absorption spectrum of plant pigments (PR and PFR), which demonstrated that the as-synthetized phosphors can be well used as a potential artificial light source for the field of indoor plant growth. Furthermore, we particularly make a thorough inquiry into the temperature sensing performance of the as-obtained Sr2ScTaO6:Mn4+, Eu3+ phosphors at 300 K–500 K, and the maximum relative sensitivity can reach 3.66% K−1. The above unique characteristics can prove that the as-obtained phosphors have the great potentiality to be used for indoor plant growth lighting and optical temperature sensing.

Luminescence properties of Mn4+-doped CaAl2O4as a red emitting phosphor for white LEDs

A series of Mn4+-activated CaAl2O4 (CAO) compounds were synthesized by co-precipitation to seek a candidate for a red-emitting phosphor to be employed in a white LED. The crystal structure, morphology, and fluorescence properties of the as-obtained phosphors were investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL). The deep red luminescence of Mn4+ in CaAl2O4 is reported and discussed. The excitation spectrum exhibited broadband emission between 260 and 550 nm with three peaks dominating at 320 nm due to the transition of 4A24T1. Theemission spectra between 600 to 720 nm displays an overwhelming emission peak at 654 nm owing to the 2E4A2 transition of Mn4+ ion.This research demonstrates the great promise of CaAl2O4:Mn4+ as a commercial red phosphor in warm white LEDs and opens up new avenues for the exploration of novel non-rare-earth red-emitting phosphors.

Tunable blue-red dual emission via energy transfer in Na4CaSi3O9: Ce3+, Mn2+ phosphors for plant growth LED

Along with the rapid development of modern agriculture, plant growth requires better light quality. Blue and red light play a crucial role in plant growth, so achieving blue-red dual light emission is urgently needed. The energy transfer (ET) between two independent luminous centers is an effective means to regulate the blue-red dual emission. Hence, Ce3+-Mn2+ co-doped Na4CaSi3O9 (NCSO) phosphors are successfully synthesized by a conventional high-temperature solid-state method. The crystal structure and phase purity of NCSO phosphors are confirmed by X-ray powder diffraction (XRD) and Rietveld structure refinement. Ce3+ and Mn2+ co-doped NCSO phosphors exhibit blue - red dual emission under the excitation of 336 nm. The blue emission mainly comes from the 5d-4f transition of Ce3+, while the red emission belongs to the 4T1(4G)-6A1(6S) spin-forbidden transition of Mn2+. The emission spectra of NCSO: Ce3+, Mn2+ is in good agreement with the absorption spectra of chlorophyll. The ET process from Ce3+ to Mn2+ is studied and the temperature-dependent luminescence is examined to verify the thermal stability of phosphor. These results indicate that the as-obtained phosphors may have potential applications in plant growth lighting.

Multi-site occupancies and luminescence properties of cyan-emitting Ca9–xNaGd2/3(PO4)7:Eu2+ phosphors for white light-emitting diodes

Cyan-emitting Ca9NaGd2/3(PO4)7:Eu2+ phosphors were synthesized via high temperature solid-state route. X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used to verify the phase and morphology of the Ca9NaGd2/3(PO4)7:Eu2+ (CNGP:Eu2+) phosphors. The as-obtained phosphor exhibits a broad excitation band of 250–420 nm, which is near the ultraviolet region. An intense asymmetric cyan emission at 496 nm corresponds to the 5d-4f transition of Eu2+. The multiple-site luminescent properties of Eu2+ ions in CNGP benefit from versatile structure of β-Ca3(PO4)2 compounds. The effective energy transfer distance is 5.46 nm (through the spectral overlap calculation), validating that the resonant energy migration type is via dipole–dipole interaction mechanism. Compared to the initial one at room temperature, the luminescent intensity of CNGP:Eu2+ phosphor can maintain 77% as it is heated up to 420 K. A white light-emitting diode (WLED) with excellent luminescent properties was successfully fabricated. Moreover, the CIE chromaticity coordinates of fabricated WLED driven by changing current just change slightly.

Realizing bright blue-red color-tunable emissions from Gd2GeO5:Bi3+,Eu3+ phosphors through energy transfer toward light-emitting diodes

Novel Bi3+/Eu3+ ions co-doped Gd2GeO5 (GGO) phosphors were prepared by a high-temperature solid-state reaction method. X-ray diffraction, photoluminescence (PL), CIE chromaticity coordinates, internal quantum efficiency (IQE), and temperature-dependent PL spectra were applied to analyze the as-obtained phosphors. The emission spectra of the GGO:Bi3+,Eu3+ phosphors showed both a broad blue band of Bi3+ emission centered at 453 nm and the characteristic sharp red emission lines of Eu3+, corresponding to the 3P1→1S0 allowed transition of the Bi3+ ions and the 5D0→7FJ (J = 0, 1, 2, 3, 4) transitions of the Eu3+ ions, respectively. Notably, the as-prepared GGO:Bi3+,Eu3+ phosphors exhibited color-tunable emissions from blue (Bi3+) to red (Eu3+) with increasing the Eu3+ doping concentration via a high-efficiency energy transfer process. Moreover, the mechanism of energy transfer from Bi3+ to Eu3+ ions was determined to be the dipole-quadrupole interaction. Impressively, the optimal GGO:0.05Bi3+,0.12Eu3+ phosphors had an outstanding IQE as great as 88% and good thermal stability. All these meaningful results demonstrated that blue-red color-tunable GGO:Bi3+,Eu3+ phosphors have potential applications in white light-emitting diodes (LEDs) and plant growth LEDs.

Synthesis, energy transfer and multicolor luminescent property of Eu3+-doped LiCa2Mg2V3O12 phosphors for warm white light-emitting diodes

Abstract In this study, Eu3+-doped LiCa2Mg2V3O12 (LCMVO) phosphors with multicolor luminescent property were prepared by the solid phase reaction. Their structure, morphology and luminescent property were studied systematically by X-ray diffraction, scanning electron microscope and photoluminescence spectra. The LCMVO phosphors showed pure cubic crystal structure with space group ( I a 3 ¯ d ) and irregular spherical morphology. The excitation spectra showed a strong absorption to ultraviolet light. Under the excitation wavelength at 360 nm, they exhibited a cyan emission with a luminescence center at 520 nm. When Eu3+ ions were doped into LCMVO system, the Eu3+ characteristic emissions were also observed and the emission colors were tuned from cyan to orange via adjusting Eu3+ ion concentration. Further, electric dipole-quadrupole interaction and luminescence decay curves were adopted to explain the energy transfer from (VO4)3- to Eu3+. The emission spectra of as-obtained phosphors at different temperature were measured to evaluate their thermal stability. The quantum efficiency values were measured to be 42.5% for LCMVO host and 38.6% for LCMVO: 0.01Eu3+ sample. The final prepared LED lamp showed easeful warm white light with suitable Ra of 89 and CCT of 3847 K, respectively. These results suggest LCMVO phosphors may be applied in near ultraviolet chip-excited white light-emitting diodes.

Realizing Bright Blue-Red Color-Tunable Emissions from Gd <sub>2</sub>GeO <sub>5</sub>:Bi <sup>3+</sup>Eu3+ Phosphors Through Energy Transfer Toward Light-Emitting Diodes

Novel Bi3+/Eu3+ ions co-doped Gd2GeO5 (GGO) phosphors were prepared by a high-temperature solid-state reaction method. X-ray diffraction, photoluminescence, and CIE chromaticity coordinates were applied to analyze the as-obtained phosphors. The as-prepared GGO:Bi3+,Eu3+ phosphors showed color-tunable emissions from blue (Bi3+) to red (Eu3+) with increasing the Eu3+ doping concentration via a high-efficiency energy transfer process. Moreover, the mechanism of energy transfer from Bi3+ to Eu3+ ions was the dipole-quadrupole interaction. All these meaningful results demonstrated that blue-red color-tunable GGO:Bi3+,Eu3+ phosphors have potential applications in white light-emitting diodes (LEDs) and plant growth LEDs.

Tuning of the emission color via energy transfer from Bi3+ to Eu3+ ion in the Eu3+, Bi3+ doped calcium germanate phosphor for warm white LEDs

In the lighting field, it is essential to seek the phosphor materials with tunable emission for warm white light-emitting diodes (wLEDs). Herein, we reported a new type of Eu3+, Bi3+ doped calcium germanate phosphor, which can exhibit a broad emission tuning from blue, white and to red. According to the XRD results, the structure purity of all as-obtained germanate phosphors are revealed to feature a trigonal structure with the space group of R3(No. 146). Structural analysis shows that the dopants of Eu3+ and Bi3+ should tend to substitute the Lu sites in the crystal host. The photoluminescence (PL) spectroscopy shows that the Eu3+ and Bi3+ ions can emit the blue emission and the red emission upon excitation at 297 nm and 393 nm, respectively. In view of the significant spectral overlapping between the excitation wavelength of Eu3+ and the emission wavelength of Bi3+, we study the energy transfer from Bi3+ and Eu3+ ion and reveal that the energy transfer is happened via an electric dipole–dipole (d–d) interaction. Remarkably, when the doping content of Bi3+ ions is fixed, changing the doping content of Eu3+ ions can induce the emission color tuning from blue, white and to red. To explain better the PL observation, a mechanistic pattern, which bases on the energy transfer from Bi3+ and Eu3+ ion, has been also constructed, which is expected to provide a general idea for achieving the energy-transfer-controlled tunable phosphor materials for phosphor-converted wLEDs.

Tunable emission with excellent thermal stability in single-phased SrY2O4:Bi3+,Eu3+ phosphors for UV-LEDs

Novel single-phased phosphors SrY2O4:Bi3+,Eu3+ (SYO:Bi3+,Eu3+) with tunable emitting were successfully synthesized by the conventional solid-state method. X-ray diffraction, excitation and emission spectra, decay curves as well as temperature-dependent luminescence were applied to characterize the as-obtained phosphors. Under ultraviolet (UV) excitation, blue luminescence centered at 410 nm was found in SYO:Bi3+. By introducing Eu3+ into SYO:Bi3+, highly efficient energy transfer (ET) process with ET efficiency of 92.65% from Bi3+ to Eu3+ was obtained before concentration quenching. The possible ET mechanism from Bi3+ to Eu3+ were investigated systematically. By altering Eu3+ content, tunable emission from blue to red was realized. More importantly, investigation of the thermal stability showed that over 98% of the room-temperature emission intensity was still preserved at 155 °C, which is superior to that of most recently reported Bi3+,Eu3+ co-doped phosphors. These results indicate that this kind of easy fabrication, low-cost and highly stable SYO:Bi3+,Eu3+ are potential candidates for blue-red phosphors for application in UV chip based w-LEDs.

Synthesis and luminescent properties of CaCO3:Eu3+@SiO2 phosphors with core–shell structure

Integrating the processes of preparation of CaCO3:Eu3+ and its surface-coating, core–shell structured CaCO3:Eu3+@SiO2 phosphors with red emission were synthesized by the carbonation method and surface precipitation procedure using sodium silicate as silica source. The phase structure, thermal stability, morphology and luminescent property of the as-synthesized samples were characterized by X-ray diffraction, Fourier transform infrared spectrum, thermal analysis, field-emission scanning electron microscopy, transmission electron microscope and photoluminescence spectra. The experimental results show that Eu3+ ions as the luminescence center are divided into two types: one is at the surface of the CaCO3 and the other inhabits the site of Ca2+. For CaCO3:Eu3+@SiO2 phosphors, the SiO2 layers are continuously coated on the surface of CaCO3:Eu3+ and show a typical core–shell structure. After coated with SiO2 layer, the luminous intensity and the compatibility with the rubber matrix increase greatly. Additionally, the luminous intensity increases with the increasing of Eu3+ ions concentration in CaCO3 core and concentration quenching occurs when Eu3+ ions concentration exceeds 7.0 mol%, while it is 5.0 mol% for CaCO3:Eu3+ phosphors. Therefore, preparation of CaCO3:Eu3+@SiO2 phosphors can not only simplify the experimental process through integrating the preparation of CaCO3:Eu3+ and SiO2 layer, but also effectively increase the luminous intensities of CaCO3:Eu3+ phosphors. The as-obtained phosphors may have potential applications in the fields of optical materials and functional polymer composite materials, such as plastics and rubbers.

Crystal structure, energy transfer and tunable luminescence properties of Ca8ZnCe(PO4)7:Eu2+,Mn2+ phosphor

Single-phased Ca8ZnCe(PO4)7:Eu2+,Mn2+ phosphors with whitlockite-type structure have been prepared via the combustion-assisted synthesis technique. The XRD pattern show that the as-obtained phosphors crystallize in a trigonal phase with space group of R-3c (161). Ca8ZnCe(PO4)7 host is full of sensitizers (Ce3+) and the Ce3+ emission at different lattice sites has been discussed. The efficient energy transfers from Ce3+ ions to Eu2+/Mn2+ ions and from Eu2+ to Mn2+ have been validated. Under UV excitation, the emitting color of Ca8ZnCe(PO4)7:Eu2+/Mn2+ samples can be modulated from violet blue to green and from violet blue to red-orange by the energy transfers of Ce3+→Eu2+ and Ce3+→Mn2+, respectively. Additionally, white emission has been obtained through adjusting the relative concentrations of Eu2+ and Mn2+ ions in the Ca8ZnCe(PO4)7 host under UV excitation. These results indicate that as-prepared Ca8ZnCe(PO4)7:Eu2+,Mn2+ may be a potential candidate as color-tunable white light-emitting phosphors.

Eu3+-doped double perovskite-based phosphor-in-glass color converter for high-power warm w-LEDs

Phosphors-in-glass (PiG), which serves as a potential bi-replacement of both phosphors and organic encapsulants in high-power white light-emitting diodes (w-LEDs), has captured much attention due to its high thermal conductivity and excellent thermal stability. Aiming to tune the correlated color temperature and color rendering index of YAG:Ce3+ PiG-based LED device, an efficient phosphor play an important function as red components are in demand to incorporate into the PiG composite. In this study, the Ca2LaSbO6:Eu3+ red phosphor with double perovskite structure has been synthesized through a high-temperature solid-state reaction. The quantum efficiency of the as-obtained phosphor reaches as high as 81%, and its luminescence intensity can remain above 80% at the temperature below of 423 K. Subsequently, the high-efficiency Ca2LaSbO6:Eu3+ and commercial YAG:Ce3+ phosphors are incorporated into the TeO2-based glass to form the PiG composite. Impressively, the original emissive properties of the embedded phosphor particles are retained. Finally, the PiG encapsulated high-power w-LEDs are fabricated, exhibiting improved chromaticity feature and superior optical performance. By adjusting the mass ratio of Ca2LaSbO6:Eu3+ red phosphor to YAG:Ce3+ yellow one in the PiG composite, a tunable correlated color temperature ranging from cool white (6665 K) to warm one (3993 K) and the color rendering index increasing from 70.6 to 86.7 are achieved. Especially, the structured warm w-LEDs exhibits good color stability under different drive currents.

A near-ultraviolet (NUV) converting blue-violet Mg2-xAl3.96Si5.04O18:xCe3+ phosphor for white light-emitting-diodes (w-LEDs)

A phosphor Mg2-xAl3.96Si5.04O18:xCe3+, x=0.02–0.14 for white NUV w-LEDs has been prepared using solid-state reaction method. The as-obtained phosphors have been investigated by fluorescence spectrophotometer and XRD, respectively. The XRD data demonstrate the aim phase has been synthesized and the diffraction peaks have shifted with the increasing of Ce3+ concentration. The Mg2-xAl3.96Si5.04O18:xCe3+ phosphor shows a strong blue-violet emission under the excitation of NUV radiation. The fitting results of the emission spectra show the emission spectrum contains two single bands, which come from the transition of 2D2/3→2F7/2 and 2F5/2 of the Ce3+ ion. The colorimetric coordinate of sample with x=0.06 is (0.1499, 0.0704), locating in blue-violet region. We have obtained bright blue-violet light via pumping the sample by NUV light (λ≈302nm), suggesting that this material be potential as a NUV converting blue-violet phosphor for the NUV w-LEDs.

Synthesis and luminescence of β-SrGe(PO4)2:RE (RE=Eu2+,Eu3+,Tb3+) phosphors for UV light-emitting diodes

A new series of β-SrGe(PO4)2:RE (RE=Eu2+,Eu3+,Tb3+) phosphors were synthesized and characterized by using X-ray powder diffraction as well as excitation, and emission spectroscopy. The results exhibited that the singly doping Eu2+, Tb3+ and Eu3+ of β-SrGe(PO4)2 emit strong blue, green and red light under UV irradiation, respectively. Based on the charge transfer transitions of O2−→RE3+, an overlapping excitation band of the as-obtained phosphors could be found in UV region, which made β-SrGe(PO4)2:RE (RE=Eu2+,Eu3+,Tb3+) serve as a new series of RGB phosphors. Meanwhile, these phosphors could also be excited by 380 nm excitation simultaneously, and hence the three phosphors mixed physically could achieve the tunable hues from blue to white region by adjusting the mixed ratios.