Emission Phosphor Research Articles

Preparation of Mn Doped Mg<sub>2</sub>TiO<sub>4</sub> Deep Red Emitting Phosphor by Liquid Phase Synthesis

Preparation of Mn Doped Mg<sub>2</sub>TiO<sub>4</sub> Deep Red Emitting Phosphor by Liquid Phase Synthesis

Preparation of Mn Doped Mg<sub>2</sub>TiO<sub>4</sub> Deep Red Emitting Phosphor by Liquid Phase Synthesis

Preparation of Mn Doped Mg<sub>2</sub>TiO<sub>4</sub> Deep Red Emitting Phosphor by Liquid Phase Synthesis

A laser current control algorithm to avoid color distortion in laser projection displays

AbstractLaser display technology has gradually become an important solution for large screen display. As a mature lighting technology in recent decades, phosphor has been widely used in the field of lighting and display. As a solid‐state light source, it has the advantages of low power consumption, environmental protection, rich color, and dynamic modulation. The luminescent efficiency of phosphors varies with temperature, which results in the nonlinearity of phosphor emission when the light source is dynamically modulated and the color temperature drift of the display image. In this paper, a control model of color temperature of laser TV display changing with laser current and temperature is established. The color temperature of laser TV is corrected by using current compensation control algorithm. The problem of color temperature drift caused by the change of phosphor conversion efficiency with t7emperature is solved. The color temperature deviation is 1118 K in the luminance range of the light source before compensation. By compensating and controlling the laser current, the ratio of blue light and phosphor is constant when the luminance changes, thus ensuring the color temperature constant when the luminance of the laser light source changes. The color temperature deviation is 50 K in the luminance range. By analyzing the different luminance of the display image, the stability of the color temperature is improved.

High Thermal Stability Apatite Phosphors\xa0Ca2La8(SiO4)6O2:Dy3+/Sm3+ for White Light Emission: Synthesis, Structure, Luminescence Properties and Energy Transfer

What ideal w-LED phosphors always aim to do is to achieve a single phase near-sunlight emission phosphor simultaneously with both high luminescence efficiency and high thermal stability at operation temperature. And It is well known that apatite compound phosphors are one of the most promising optical materials to realize those above because of their unique structure enhanced luminescence properties and thermal stability. Here, we synthesized a co-doped single phase apatite phosphors Ca2La8(SiO4)6O2:Dy3+/Sm3+ (CLSO:Dy3+/Sm3+) for white light emission, which was provided with excellent thermal stability and of which luminescence intensity at 150 °C still was 92 percentage of that at room temperature. Moreover, X-ray diffraction technique, Fourier transform infrared spectroscopy, scanning electron microscope were employed to characterization of phase structure and morphology, and consequently pure apatite structure and gravel-like morphology of phosphors were proved. Analysis of photoluminescence spectra indicated that concentration quenching effect exist in single-doped CLSO:Dy3+ phosphors owing to dipole-dipole interaction between Dy3+ ions. It is revealed that maybe exist Dy3+ ↔ Sm3+ bilateral non-radiative energy transfer processes in Dy3+/Sm3+ co-doped CLSO system by PL spectra and decay curves. And variation of Sm3+ ion concentration can control color emission, namely CIE chromaticity coordinates and correlated color temperature, finally to achieve white light emission (0.309,0.309) with CCT 6848 K, able to be a potential candidate for commercial lighting applications.

Luminescence and Energy-Transfer Properties in Bi3+/Mn4+-Codoped Ba2GdNbO6 Double-Perovskite Phosphors for White-Light-Emitting Diodes.

Currently, the study of Mn4+-doped oxide red phosphor is a hot research topic to solve the lack of red component in phosphor-converted white-light-emitting diodes (pc-WLEDs). In this Article, we designed Gd3+/Nb5+ cation substitution by Bi3+/Mn4+ in Ba2GdNbO6 with double-perovskite structure based on the radius and coordination of the cations through high-temperature solid-state reaction. The phase purity and microstructure of double-perovskite Ba2GdNbO6:Bi3+,Mn4+ phosphors were characterized by X-ray diffraction and scanning electron microscopy examination. The crystal structures were also determined by the Rietveld refinement, and the photoluminescence (PL) properties were systematically studied. Bi3+ and Mn4+ ions can be effectively doped in the Ba2GdNbO6 matrix with an optical band gap of 3.94 eV. Upon 315 nm UV excitation, the Ba2GdNbO6:Bi3+,Mn4+ phosphor shows two emission bands at 464 nm from Bi3+ and 689 nm from Mn4+, respectively. By the design of Bi3+ → Mn4+ energy transfer, systematic luminescence tuning from blue to red could be achieved because of spectral overlap between the emission spectrum of Bi3+ and the excitation spectrum of Mn4+. The corresponding mechanism of the Bi3+ → Mn4+ energy-transfer process was investigated in detail by the fluorescence decays and PL spectra. The red emission intensity of Mn4+ has been greatly improved by Bi3+ → Mn4+ energy transfer. Moreover, the phonon vibration and zero phonon line of Mn4+ were studied through temperature-dependent PL. Finally, a WLED was fabricated using a 460 nm blue chip with a yellow YAG:Ce3+ phosphor and a red Ba2GdNbO6:0.01Bi3+,0.01Mn4+ phosphor, which has a low correlated color temperature (3550 K) and a high color rendering index (89.6). The above results imply that the improved red emission phosphors have a potential application in warm pc-WLED lighting.

Novel orange–red emitting phosphor Sr8ZnY(PO4)7:Sm3+ with enhanced emission based on Mg2+ and Al3+ incorporation for plant growth LED lighting

Abstract In this paper, a series of novel orange-red emission phosphors Sr8ZnY(PO4)7:Sm3+ (SZYP:Sm3+) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l'Eclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f–f forbidden transition of Sm3+. The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm3+ reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm3+ were further investigated. It was found SZYP:Sm3+ can maintain 93% of initial emission intensity at 150 °C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg2+ and 0.02Al3+ incorporated SZYP:0.09Sm3+ reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm3+ is suitable for the application in plant growth LED lighting.

Crystal structure and pale-yellow emitting properties of K3Gd1-xDyxB6O12 solid solutions.

A new potassium dysprosium polyborate, K3DyB6O12, has been prepared via the high-temperature molten salt method and structurally characterized by single-crystal X-ray diffraction analysis. The structure can be described as a three-dimensional framework composed of isolated bicyclic [B5O10]5- groups and Dy3+ and K+ ions. The Fourier transform IR (FT-IR) and ultraviolet-visible (UV-Vis) spectra were investigated. A series of K3Gd1-xDyxB6O12 phosphors was prepared and their photoluminescence properties were studied. The K3Gd1-xDyxB6O12 phosphors exhibit a strong yellow emission band at 577 nm (the 4F9/2→6H13/2 transition of Dy3+) under UV excitation of 275 nm (the 8S7/2→6IJ transition of Gd3+), suggesting the occurrence of the energy transfer Gd3+→Dy3+. The optimized doping concentration of the Dy3+ ion was 8 mol%. We may expect that K3Gd1-xDyxB6O12 is a promising pale-yellow emission phosphor for visual displays or solid-state lighting.

29.4: A laser current control algorithm to avoid color distortion in laser projection displays

Laser display technology has gradually become an important solution for large screen display. As a mature lighting technology in recent decades, phosphor has been widely used in the field of lighting and display. As a solid‐state light source, it has the advantages of low power consumption, environmental protection, rich color and dynamic modulation. The luminescent efficiency of phosphors varies with temperature, which results in the non‐linearity of phosphor emission when the light source is dynamically modulated and the color temperature drift of the display image. In this paper, a control model of color temperature of laser TV display changing with laser current and temperature is established. The color temperature of laser TV is corrected by using current compensation control algorithm. The problem of color temperature drift caused by the change of phosphor conversion efficiency with temperature is solved. The color temperature deviation is 1118 K in the brightness range of the light source before compensation. By compensating and controlling the laser current, the ratio of blue light and phosphor is constant when the brightness changes, thus ensuring the color temperature constant when the brightness of the laser light source changes. The color temperature deviation is 50K in the brightness range. By analyzing the different brightness of the display image, the stability of the color temperature is improved.

Non-stoichiometric Ce-doped LiAl5O8 phosphors: Synthesis, structural and optical properties

Abstract Structural and optical properties of non-stoichiometric pure and doped LiAl5O8 prepared via a simple sol-gel using glucose were investigated. X-ray diffraction, scanning electron microscopy, and photoluminescence measurements were used to characterize the prepared samples. By employing Ce3+ as trivalent ion doped in the LiAl5O8 lattice, the effects of non-stoichiometry of Li+ on the network parameters and luminescence properties were systematically investigated. A non-stoichiometric in LiAl5O8 led to a lattice change and local symmetry distortion. Lattice variation and doping effects, and its relevant defect chemistry had a significant impact on the luminescence properties. The luminescence emission of Ce-doped LiAl5O8 phosphors showed an intensity change with variation of Lithium concentration, which is thought to be related to doping effects and variation of lattice parameters. Therefore, with nonstoichiometric control, the luminescence of Ce-doped LiAl5O8 phosphors can be well regulated and optimized. Emission lines assigned to Fe3+ and Cr3+ impurities originated from start reagents used in the sample synthesis were also observed.

Examination on red emission of up-conversion phosphors with Bi-containing host materials

Examination on red emission of up-conversion phosphors with Bi-containing host materials

Synthesis and Optical Properties of BaSiO3:RE3+ (RE = Sm, Eu) Phosphors

BaSiO3:RE3+ (RE = Sm or Eu) phosphor powders with different concentrations of activator ions are synthesized using the solid-state reaction method. The effects of the concentration of activator ions on the structural, photoluminescent, and morphological properties of the barium silicate phosphors are investigated. X-ray diffraction data reveals that the crystal structure of all the phosphors, regardless of the type and the concentration of the activator ions, is an orthorhombic system with a main (111) diffraction peak. The grain particles agglomerate together to form larger clusters with increasing concentrations of activator ions. The emission spectra of the Sm3+-doped BaSiO3 phosphors under excitation at 406 nm consist of an intense orange band at 604 nm and three weak bands centered at 567, 651, and 711 nm, respectively. As the concentration of Sm3+ increases from 1 to 5 mol%, the intensities of all the emission bands gradually increase, reach maxima at 5 mol% of Sm3+ ions, and then decrease significantly with further increases in the Sm3+ concentration due to the concentration quenching phenomenon. For the Eu3+-doped BaSiO3 phosphors, a strong red emission band at 621 nm and several weak bands are observed. The optimal orange and red light emissions of the BaSiO3 phosphors are obtained when the concentrations of Sm3+ and Eu3+ ions are 5 mol% and 15 mol%, respectively.

Color tuning and white light emission in a single-phased La2Ti2O7:Pr3+, Tb3+ phosphor

Color-tunable and white-emitting Pr3+ and Tb3+ co-doped La2Ti2O7 phosphors were prepared via a molten salt method. The as-synthesized samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), diffuse reflection spectra (DRS), photoluminescence spectra (PL), fluorescence decay curves and temperature-dependent photoluminescence spectra in detail. The La2Ti2O7:Pr3+, Tb3+ phosphors are uniform square-like nanobelt and the band gap of La2Ti2O7 host is calculated to be 3.83 eV by DRS. Under 296 nm wavelength UV excitation, the La2Ti2O7:Pr3+ compounds show strong red emission with peaking at 612 nm. Four typical emission lines of Tb3+ ions are observed from the region of 480–650 nm in La2Ti2O7:Tb3+ phosphors, and the strongest green emission peak is located at 545 nm. What's more, the emission color of La2Ti2O7:0.001Pr3+, 0.010 Tb3+ can be tuned from white (0.3274, 0.3379) to pink (0.4777, 0.2890) upon the excitation from 290 to 348 nm and the emission color of La2Ti2O7:0.001Pr3+, xTb3+ can be also tuned from white to green by changing the concentration of Tb3+. The La2Ti2O7:Pr3+, Tb3+ phosphors have the poor temperature dependence, resulting from the value of ΔR (the displacement between parabolas of the intervalence charge transfer states and ground states) for Tb3+ and Pr3+ both are larger. The results indicate that La2Ti2O7:Pr3+, Tb3+ phosphors could be a promising tunable and white light emission phosphor.

A novel Ba4Gd3K3(PO4)6F2:Eu2+ blue-white emitting phosphor for near-ultraviolet excited light-emitting diodes

Exploring new phosphors with broadband emission could find potential applications in white light emitting diodes (w-LEDs). However, it is still a severe challenging to achieve a broadband emission in single activator doped phosphors. Herein, we reported a novel apatite-type Ba4Gd3K3(PO4)6F2:Eu2+ phosphor with broadband blue-white emission, which almost cover the whole visible light range. Differing from previous reports, we prove that the broadband emission is originated from the accommodation of Eu2+ ions in the M(1), Gd(2) and K(3) sites, respectively. Emission spectrum and luminescence decay curves further confirm the existence of three emission centers in Ba4Gd3K3(PO4)6F2:Eu2+ phosphor. White LED (Ra = 81 and CCT = 3780K) can be obtained by depositing Ba4Gd3K3(PO4)6F2:Eu2+ and red-emitting CaAlSiN3:Eu2+ phosphors on 395 nm LED chip. Moreover, the as-obtained Ba4Gd3K3(PO4)6F2:Eu2+ phosphor can give an stable color output at high temperature, demonstrating that this novel phosphor could be an potential candidate for next-generation near ultraviolet excited white LEDs.

The structure and photoluminescence properties of a novel orange emission phosphor Ba3Sc1.9Al0.1B4O12: Eu2+ excited by NUV light

A novel borate mineral of Ba3Sc1.9Al0.1B4O12 was synthesized successfully by traditional high temperature solid-state reaction. Its structure is determined by High-resolution transmission electron microscopy, Energy Dispersive X-Ray Spectroscopy and X-ray powder diffraction Rietveld refinement. The crystal structure of Ba3Sc1.9Al0.1B4O12 was found to be trigonal crystal system and the space group is attributed to P-3m1 (164). Moreover, a series of Eu2+ doped Ba3Sc1.9Al0.1B4O12 phosphors are investigated. The electron structure, band structure and photoluminescence properties of Ba3Sc1.9Al0.1B4O12: Eu2+ are investigated in detail by density functional theory calculations, diffuse reflection spectra, emission-excitation spectra, decay curves and temperature dependence spectra. It can emit orange light peaking at ∼592 nm upon 400 nm NUV excitation with quantum efficiency 40.1%. According to structure and photoluminescence (PL) properties analysis, Eu2+ can occupy two kinds of Ba2+ site. The concentration quenching mechanism of Eu2+ could be a d-d interaction luminescence center. It has not good temperature stability properties because of too much temperature-dependent electron–phonon interaction at high temperature. The fabricated white-LEDs using a 370 nm GaN NUV chip combined with orange/blue phosphors under different weight ratio driven by 30 mA current can get series warm-white light, which the correlated color temperature is smaller than ‘YAG + Blue chips’ It demonstrates that Ba3Sc1.9Al0.1B4O12: Eu2+ is a potential orange phosphor matching NUV LED chips to get warm white light.

Thermoluminescence and infrared stimulated luminescence in long persistent monoclinic SrAl2O4:Eu2+,Dy3+ and SrAl2O4:Eu2+,Nd3+ phosphors

We report on the photoluminescence, long persistence luminescence, and thermally and optically stimulated luminescence properties of SrAl2O4:Eu2+,Dy3+ and SrAl2O4:Eu2+,Nd3+ phosphors synthetized by the combustion method and annealed under a carbon atmosphere at 1150 °C for 6 h. XRD indicated the presence of a single monoclinic crystalline phase for both phosphors. After exposure to beta radiation, the phosphors exhibited an intense persistent luminescence lasting more than 220 h. After excitation with 375 nm light the emission spectra depict a broad band peaked at 515 nm, which is the characteristic for Eu2+ emission in SrAl2O4 phosphors, and two weak bands at about 405 and 425 nm. After beta irradiation, the Dy co-doped phosphor exhibits an intense thermoluminescence (TL) with a maximum around 60 °C and a weaker peak at 140 °C. The low temperature TL of the Nd co-doped phosphor consist of three peaks; two well-separated peaks with maxima at about 80 and 160 °C and the third one with the maximum near 50 °C, which becomes evident at doses higher than 10 Gy. Stimulation with IR light of 830 nm releases trapped charges caused by irradiation exposure, generating an intense IR stimulated luminescence (IRSL), which exhibits a typical time decay behavior for continuous wave optically stimulated luminescence. The persistence luminescence and IRSL were related to the release of electrons from the traps responsible for the 60 and 140 °C TL peaks in SrAl2O4:Eu2+,Dy3+ and the 80 and 160 °C TL peaks in SrAl2O4:Eu2+,Nd3+ phosphors, respectively.

Blue-Green-Yellow Color-Tunable Luminescence of Ce3+-, Tb3+-, and Mn2+-Codoped Sr3YNa(PO4)3F via Efficient Energy Transfer.

Tunable blue-green-yellow emitting Sr3YNa(PO4)3F (SYNPF):Ce3+,Tb3+,Mn2+ phosphors have been prepared via a high-temperature solid-state reaction method. The structural and luminescent properties, energy transfer (ET) mechanism, and thermal quenching of the samples are investigated in detail. The ET from Ce3+ to Tb3+ and Mn2+ in SYNPF is identified as the interaction of the electric dipole-quadrupole with ET efficiencies of 81.6% and 69.3%, respectively. The critical distances for Ce3+/Tb3+ and Ce3+/Mn2+ are calculated through the spectral overlap method to be 9.54 and 10.92 Å. Under UV excitation, high-efficiency tunable blue-green-yellow emissions from Ce3+ to Tb3+ and Mn2+ can be obtained. Moreover, white light can also be achieved by adjusting the stoichiometry of Ce3+ and Mn2+ properly in the SYNPF phosphor. In addition, the temperature-dependent luminescence spectra exhibit good thermal quenching behaviors for the as-prepared phosphors. The above results suggest that SYNPF:Ce3+,Tb3+,Mn2+ phosphors can act as color-tunable emission phosphors for potential applications in WLEDs.

Enhanced absorption of Sr3Lu2(BO3)4:Ce3+,Tb3+ phosphor with energy transfer for UV-pumped white LEDs

A series green emission phosphors Sr3Lu2(BO3)4:Ce3+,Tb3+ (denoted as SLBO:Ce3+,Tb3+) with broad absorption band matching well with UV LED chip were synthesized by the solid–state reaction method. The phase and structure were analyzed with XRD, EDX, FT-IR measurements. The energy transfer between Ce3+ and Tb3+ in SLBO was proved by spectra and decay curves detailedly. The emission colors vary from blue to green by adjusting the ratio of Ce3+/Tb3+ doped concentration. With temperature increasing, SLBO:Ce3+,Tb3+ phosphor shows well thermal stability that emission intensity retains 70% of its initial at 25 °C even temperature rising to 150 °C. The internal and external quantum efficiency of SLBO:3%Ce3+,8%Tb3+ are 77.5% and 34.8% under 340 nm excitation, respectively. Combining the as-synthesized SLBO:Ce3+,Tb3+ and red emission phosphor CaAlSiN3:Eu2+ coated on a 365 nm UV chip, a warm white LEDs device with CRI of 83 was achieved. All the results indicate that the SLBO:Ce3+,Tb3+ phosphor has potential application in UV pumped white LEDs.

Imaging phosphor thermometry from T = 20 °C to 450 °C using the time-domain intensity ratio technique

We present an imaging phosphor thermometry system using the time-domain intensity ratio technique and demonstrate surface temperature measurements that are traceable to ITS-90 with a calibration Standard uncertainty of 0.5 °C, over the range 20 °C to 450 °C. The thermographic phosphor used was Mg4FGeO6:Mn. Typically, imaging phosphor thermometry systems make use of the intensity ratio of the phosphor emission in two discrete wavelength bands, measured simultaneously using two cameras viewing the same surface. However, difficulties can arise with image registration (the requirement to spatially align the two images) due to lens distortion, non-normal viewing angles and camera alignment, and this can result in large temperature errors. The time-domain intensity ratio technique presented here avoids these difficulties by capturing two images at different times during the phosphorescence decay process using a single monochrome camera. Each pixel of the camera integrates the light collected over the exposure time. By careful selection of an appropriate exposure time, along with the timing of each exposure (image gating), it is possible to collect two specific time integrated portions of the phosphor decay curve. The phosphor decay time can then be calculated quickly and uniquely from the ratio of these two signals and related to the temperature through calibration. With this technique, there is no requirement for high frame-rates and satisfactory results can be obtained using a relatively inexpensive camera provided that suitable triggering and exposure control are available. Here, we provide a description of the technique, the instrumentation, calibration, and preliminary measurement made on a resistively heated steel coupon, where the standard uncertainty for a single imaged pixel (80 μm × 80 μm) was 7.7 °C, 6.6 °C and 3.8 °C at temperatures of 200 °C, 300 °C and 400 °C respectively. Additionally, a sensitivity analysis and an uncertainty budget are provided.

Luminescence and energy transfer of a single-phased phosphor Y2GeO5: Bi3+, Tm3+, Tb3+, Eu3+ for white UV LEDs

A series of novel Y2GeO5: Bi3+, Tm3+, Tb3+, Eu3+ (YGO: Bi3+, Tm3+, Tb3+, Eu3+) phosphors were synthesized via high-temperature solid-state reaction. The structural, luminescent properties, as well as energy transfer mechanisms, in the phosphors were investigated in detail. The results indicate that all Bi3+, Tm3+, Tb3+ and Eu3+ ions substitute for Y3+ ions in host lattice of YGO without changing its crystal structure. Excitation and emission spectra were evaluated for the compounds. Energy transfer from Bi3+ to Tm3+, Tb3+/Eu3+ and Tb3+ to Eu3+ exist in phosphors YGO: Bi3+, Tm3+, Tb3+, Eu3+. Under the 308 nm excitation, the phosphor YGO: Bi3+, Tm3+, Tb3+ shows the characteristic transitions of Bi3+ (372 nm, 3P1, 0 → 1S0), Tm3+ (455 nm, 1D2→3F4), Tb3+ (544 nm, 5D4→7F5). However, Eu3+ is absent in the composition. Tunable colors from blue to green to red and white are achieved by varying excitation wavelength. The energy transfer from Bi3+ to Tm3+ is proved to be an electric dipole-dipole interaction. A white-light emission with the color coordinate (0.3146, 0.3541), correlated color temperature (CCT) of 6234 K, luminous efficacy of the radiation (LER) of 180 lm/W and 0.2345–0.2424 eV of activation energy for thermal quenching are obtained in the optimum phosphor YGO: 0.005Bi3+, 0.04 Tm3+, 0.07 Tb3+, 0.05Eu3+. The obtained results indicate that the YGO: Bi3+, Tm3+, Tb3+, Eu3+ phosphors can serve as potential color-tunable and single-phase white emission phosphors with impressive color stability as well as good thermal stability for n-UV excited white LEDs.

Epitaxial Growth of CsPbX3 (X = Cl, Br, I) Perovskite Quantum Dots via Surface Chemical Conversion of Cs2 GeF6 Double Perovskites: A Novel Strategy for the Formation of Leadless Hybrid Perovskite Phosphors with Enhanced Stability.

Lead halide perovskites (LHPs) have received increased attention owing to their intriguing optoelectronic and photonic properties. However, the toxicity of lead and the lack of long-term stability are potential obstacles for the application of LHPs. Herein, the epitaxial synthesis of CsPbX3 (X = Cl, Br, I) perovskite quantum dots (QDs) by surface chemical conversion of Cs2 GeF6 double perovskites with PbX2 (X = Cl, Br, I) is reported. The experimental results show that the surface of the Cs2 GeF6 double perovskites is partially converted into CsPbX3 perovskite QDs and forms a CsPbX3 /Cs2 GeF6 hybrid structure. The theoretical calculations reveal that the CsPbBr3 conversion proceeds at the Cs2 GeF6 edge through sequential growth of multiple PbBr6 4- layers. Through the conversion strategy, luminescent and color-tunable CsPbX3 QDs can be obtained, and these products present high stability against decomposition due to anchoring effects. Moreover, by partially converting red emissive Cs2 GeF6 :Mn4+ to green emissive CsPbBr3 , the CsPbBr3 /Cs2 GeF6 :Mn4+ hybrid can be employed as a low-lead hybrid perovskite phosphor on blue LED chips to produce white light. The leadless CsPbX3 /Cs2 GeF6 hybrid structure with stable photoluminescence opens new paths for the rational design of efficient emission phosphors and may stimulate the design of other functional CsPbX3 /Cs-containing hybrid structures.