White Light-emitting Phosphor Research Articles

Improving thermal stability of novel single-component white-light emitting phosphor Ca8MgLu(PO4)7:Tm3+, Dy3+ by back-energy-transfer

The light degradation of WLED devices after long-time use has been proved to be mainly caused by thermal quenching of phosphors, therefore, the design of single-component white-light emitting phosphors with high thermal stability remains a huge challenge. A novel single-phase white light-emitting phosphor Ca8MgLu(PO4)7:Tm3+,Dy3+ was designed and prepared in this work. The photoluminescent results show that white light emission from the phosphor can be achieved by controlling the ratio of Tm3+ and Dy3+ to adjust the relative intensity of the emission at 451 nm of Tm3+ and the emissions at 488, 571 and 660 nm of Dy3+. The luminescence decay results reveal that there is energy transfer from Tm3+ to Dy3+ in Ca8MgLu(PO4)7:Tm3+,Dy3+ and the efficiency of energy transfer between the two dopants reaches as much as 55%. Temperature-dependent luminescent analyses suggest the highly stable emission of Ca8MgLu0.76(PO4)7:0.12Tm3+,0.12Dy3+ as the integrated emission intensity of the phosphor at 475 K reduces only about 13% of that at room temperature, which is due to the back-energy-transfer from highly doped Dy3+ to Tm3+ that compensates the luminescence energy. This single-phase white-light emitting phosphor exhibits superior color and luminescence stability and thus may find a potential application in WLEDs.

Three-step fine-tuning by doping Bi3+, Tb3+ and Eu3+/Sm3+ in Gd2MoB2O9 host for accurate white emission

Tuning for accurate white light emission in single-composition phosphor is challenging due to the presence of complex energy transfer. Herein we report the synthesis and characterization of single-composition white light emission phosphors with accurate color coordinates, which were tuned through a three-step doping strategy. Under the excitation of 280 ​nm UV light, Gd1.474MoB2O9: 0.30Bi3+, 0.20Tb3+, 0.026Eu3+ and Gd1.46MoB2O9: 0.30Bi3+, 0.19Tb3+, 0.05Sm3+ exhibit white light emission with color coordinates of (0.339, 0.335) and (0.332, 0.346), very close to standard white light. The emission intensity at 100 ​°C maintains 82.07% and 91.35% of that of room temperature, demonstrating good thermal stability. The Gd1.474MoB2O9: 0.30Bi3+, 0.20Tb3+, 0.026Eu3+ and Gd1.46MoB2O9: 0.30Bi3+, 0.19Tb3+, 0.05Sm3+ white phosphors have the advantages of convenient synthesis conditions, stable chemical properties and emission very close to standard white light. This three-step doping strategy can be used for designing Bi3+ based single-composition white emission phosphors.

A single-phased Ca4(PO4)2O: Tm3+, Tb3+, Eu2+ white light-emitting phosphor with tunable emission color

The single-phased white light-emitting Ca4(PO4)2O: Tm3+, Tb3+, Eu2+ phosphors with tunable color emission were synthesized by solid-state reaction method. The photoluminescence properties, crystal structure, decay time and cross-relaxation from Tm3+ to Eu2+ were investigated in detail. Under excitation of 352 nm, Tm3+ singly doped Ca4(PO4)2O (denoted as TTCP) phosphors exhibited an intense emission peak at 458 nm attributed to 1D2 → 3F4 transition of Tm3+ ions and a broad emission peak in the range of 400–411 nm ascribed to oxygen vacancies in TTCP host. The emission intensity of oxygen vacancies decreases along with the increasing of Tm3+ doping concentration due to the substitution of Ca2+ and oxygen vacancies sites by Tm3+ ions. For Tm3+ and Eu2+ co-doped TTCP phosphors, the blue emission intensity (458 nm) of Tm3+ ions obviously decreased and the red emission intensity (624 nm) with of Eu2+ ions increased due to Eu2+ doping. The cross-relaxation from Tm3+ to Eu2+ ions was further demonstrated by the decay times of TTCP: 0.03 Tm3+, yEu2+ phosphors monitoring the emission peak at 458 nm. Further, Tb3+ ions were also introduced in the TTCP phosphor for a green emission and Tb3+ singly-doped TTCP phosphor displays the emission peaks at 488 nm and 545 nm due to the typical5D4→7F5 and 5D4→7F5 transition of Tb3+ ions, respectively. Finally, TTCP: Tm3+, Tb3+, Eu2+ phosphor was obtained and emitted the white light with the blue (458 nm), green (545 nm), and red (603 nm) emission bands under excitation of 352 nm. Especially, white light with tunable color temperature (3000 K–6000 K) and high color rendering index (Ra > 90) can be easily acquired. A neutral white light with high color rendering index (Ra 91.1) can be achieved for the TTCP: 0.03 Tm3+, 0.25 Tb3+, 0.004Eu2+ phosphor.

A novel multi-center activated single-component white light-emitting phosphor for deep UV chip-based high color-rendering WLEDs

Single-component white light-emitting phosphors for phosphors-converted WLEDs are a hot spot of solid-state lighting field. Dy3+ is a promising candidate for white light generation in single-component hosts; however, the inappropriate ratio of yellow light to blue and the lack of red light restrict its applications in full-color display and indoor lighting. Here, a novel multi-center activated single-component white light-emitting phosphor, Sr2LaGaO5:Dy3+,Sm3+, has been designed and synthesized. It is surprisingly found that there is no evident energy transfer between the host and the dopants even though they satisfy the rule of spectral overlap, which can be explained from the special structure of the phosphor. The co-excitation of the host and the dopants would be a facile strategy to finely tune the luminescent spectra of phosphors. By adjusting the doping concentrations of Dy3+ and Sm3+, we can control the relative intensities of the emissions peaked at 493 nm and 574 nm from Dy3+, 604 nm from Sm3+ and the broadband within the range of 400 – 500 nm from the host. Therefore, the emission color of the co-doped phosphors can be tuned from white light to orangish red region with correlated color temperature decreasing from 5708 K to 1971 K. A WLED device with extremely high color-rendering index (Ra) up to 91.4 was fabricated by coating the synthesized phosphor with a deep UV LED chip. And it is the first time to use a single-component white light-emitting phosphor co-activated with Dy3+ and Sm3+ in deep UV chip excited WLEDs with high Ra.

Luminescence properties and energy transfer of novel Bi3+ and Mn2+-co-activated Y3Ga5O12 single-component white light-emitting phosphor

A novel Bi3+ and Mn2+ co-activated Y3Ga5O12 single-component white light-emitting phosphor was developed.

Novel Composites of Graphitic‐phase Nitrogen Carbon/Lanthanide Coordination Polymers as White Light‐emitting Phosphor

Lanthanide coordination polymers (Ln‐CPs) are excellent candidates for designing white light materials due to their adjustable fluorescent characteristic by decorating organic ligands, changing metal centers and including guests. However, low quantum yield, weak blue emission, high prices and supply risks have hindered the application and developments of the pure Ln‐CPs materials. Herein, we have designed a new white color composite material capable of white light‐emission upon excitation at 338 nm, which fabricated by compositing a graphitic‐phase nitrogen carbon (g‐C3N4) treated with nitric acid and lanthanide‐based complexes, with the photoluminescencequantum yield (QY) in solid state reaching 11.7 %. WLEDs constructed by depositing the (g‐C3N4)0.783/Eu0.133/Tb0.083‐dbpt [dbpt = 3‐(3,5‐dicarboxylphenyl)‐5‐(pyrazinyl)‐1H‐1,2,4‐triazole] composites on a commercial UV LED chip feature a CIE chromaticity coordinate at (0.33, 0.33), high color rendering index (CRI) of 94.6. Compared to conventional white light‐emission Ln‐CPs materials of La0.928Eu0.045Tb0.027‐dbpt and La0.896Eu0.104‐dbpt reveals that (g‐C3N4)0.783/Eu0.133/Tb0.083‐dbpt composites have higher QY and CRI values.

Structural, tunable emission and energy transfer of Ca9In(PO4)7:Ce3+,Tb3+/Dy3+ phosphors

In this paper, we have synthesized a series of ultraviolet-emitting Ca9In(PO4)7:Ce3+,Tb3+ and Ca9In(PO4)7:Ce3+,Dy3+ phosphors. The Ca9In(PO4)7:Ce3+ phosphor exhibits bright blue emission under UV excitation. The Tb3+/Dy3+ single doped Ca9In(PO4)7 can exhibit weak green and yellow emission, respectively. Based on the efficient energy transfer from Ce3+ to Tb3+/Dy3+, the luminous efficiency of Tb3+/Dy3+ in Ca9In(PO4)7:Ce3+,Tb3+ and Ca9In(PO4)7:Ce3+,Dy3+ can be remarkably promoted. The effects of Ce3+/Tb3+/Dy3+ concentration, decay curves, PL emission and excitation spectra on the energy transfer from Ce3+ to Tb3+/Dy3+ in Ca9In(PO4)7 were investigated. The experimental results demonstrated that the energy transfer efficiency could reach 21.77 and 30.3% in Ca9In(PO4)7:Ce3+,Tb3+ and Ca9In(PO4)7:Ce3+,Dy3+, respectively. This study suggests that the synthesized Ca9In(PO4)7:Ce3+,Tb3+ and Ca9In(PO4)7:Ce3+,Dy3+ compounds have potentials to be used as white light-emitting phosphors in UV light-emitting diodes.

Photo- and thermoluminescence properties of single-phase white light-emitting Y2−xSiO5:xDy3+ nanophosphor: a concentration-dependent structural and optical study

Despite high demand, the number of white light-emitting phosphors with single activator is limited. This is due to the fact that singly doped phosphors show no emission in the required spectral region to achieve white light. In the present study, we report the synthesis of single dopant (Dy3+) activated white light-emitting Y2SiO5 nanophosphor by one-step autoignition-based solution combustion method. The influence of Dy3+ concentration on the crystal structure, surface morphology and photoluminescence (PL) properties is investigated. The Y2SiO5:Dy3+ phosphor can be efficiently excited by near-UV radiation (390 nm) that results in the blue (482 nm) and yellow (572 nm) emission bands. The white light emission is achieved by mere variation of Dy3+ concentration. The color purity of the phosphor is confirmed by CIE coordinates (x = 0.295, y = 0.372). Thermoluminescence (TL) studies are carried out by using γ radiation as excitation source, and highest intense TL glow curve is found for 5 mol% Dy3+-doped Y2SiO5. The intensity of the TL glow curves showed significant dependence on duration of γ exposure. The TL intensity parameters, such as energy of activation, order of kinetics and frequency factors, were calculated and analyzed.

Luminescence properties and energy transfer of Ce3+/Dy3+co-activated LaAl2.03B4O10.54 phosphors for wLEDs

Dy3+ ions doped inorganic materials have attracted extensive attentions for their peculiar white emission and simple preparing process. However, Dy3+ ions in these materials have low emission intensity due to the weak absorption in ultraviolet spectral region. Ce3+ ions in most of inorganic compounds show a broad emission in ultra-violet region. Thus, Ce3+ is an effective sensitizer for Dy3+. In this work, a sequence of novel white light-emitting phosphors LaAl2.03B4O10.54: Ce3+/Dy3+ was synthesized by high-temperature solid-state reaction method. Under the excitation at 310 nm, the luminescence properties and energy transfer behavior were investigated in detail for Ce3+/Dy3+ co-doped LaAl2.03B4O10.54 phosphors. The energy transfer efficiency from Ce3+ to Dy3+ was calculated to be 56% with the quadrupole–quadrupole interaction mode. The emitting color of the samples can be modulated from (0.210, 0.123) to white region (0.263, 0.237) by properly changing the doping concentration of Dy3+. The results in this work indicate that the color tunable LaAl2.03B4O10.54: Ce3+/Dy3+ phosphors may be a potential single component phosphor in the field of wLEDs.

A Robust TbIII-MOF for Ultrasensitive Detection of Trinitrophenol: Matched Channel Dimensions and Strong Host-Guest Interactions.

Host-Guest interaction is crucial to the sensitivity of heterogeneous sensors. Here, a series of isomorphic three-dimensional lanthanide metal-organic frameworks (Ln-MOFs), [Ln(TCBA)(H2O)2]2·DMF [H3TCBA = tris(3'-carboxybiphenyl)amine; Ln = Tb (1), Eu (2), and Gd (3); DMF = dimethylformamide] was synthesized and characterized, in which the propeller-like TCBA3- ligands adopt special torsional link between Tb(III) ions to form one-dimensional triangular channels. Optical experiments show that 1 exhibits bright green luminescence with an overall quantum yield of 26%, a 5D4 lifetime of 478 μs, and can act as an excellent heterogeneous fluorescent sensor to detect 2,4,6-trinitrophenol (TNP) explosive with an extremely low detection limit of 1.64 ppb. Because the confined channels within 1 exhibit matched dimensions toward TNP and feature multiple guest-response sites including rich π-conjugated groups, electron-donating N centers, and open metal nodes, strong host-guest interactions between 1 and TNP are captured and accurately determined by online microcalorimetry, which provides a distinctive thermodynamic perspective to understand the heterogeneous sensing behaviors. Additionally, the finely modulated heterometallic isomorphism [Tb0.816Eu0.184(TCBA)(H2O)2]2·DMF emits bright white light when excited at 380 nm and could potentially be used as single-phase white light-emitting diode phosphors materials.

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.

Sol-gel synthesis and luminescent properties of a novel KBaY(MoO4)3:Dy3+ phosphor for white light emission

Abstract A novel kind of yellow KBaY(MoO4)3:Dy3+ (KBYM:Dy3+ for short) phosphor was prepared via sol-gel method and evaluated as a component candidate for NUV excited LED. The structure, morphology and luminescent properties of the as-synthesized phosphor were investigated by means of X-ray diffraction (XRD), Raman spectra, scanning electron microscope (SEM), excitation and emission spectra, and decay curves. The results of XRD and Raman spectra show that KBYM:Dy3+ phosphors can be synthesized by sol-gel method at a minimum temperature of 550 °C. The excitation spectra exhibited intense absorption bands in the NUV and blue region, which match well with the commercial LED chips. Under the excitation of 352 nm, a dominant emission was found at 575 nm corresponding to the 4F9/2 → 6H13/2 transition, which means that Dy3+ ions occupy a low symmetry site in KBYM matrix. The thermal stability of the phosphor was investigated based on the crossover model, and the activation energy was determined to be 0.235 eV. The Inokuti-Hirayama (IH) model has been applied to the analysis of the decay curves, and the results showed that the energy transfer process among Dy3+ ions is controlled by dipole-dipole interactions. Lastly, both yellow and white LEDs were fabricated with the as-synthesized phosphor and their luminescent performances were investigated as a function of filament currents.

Photoluminescence properties and energy transfer in a novel Sr8ZnY(PO4)7:Tb3+,Eu3+ phosphor with high thermal stability and its great potential for application in warm white light emitting diodes

Energy transfer from Tb3+ to Eu3+ was observed and verified in a warm white light emission phosphor SZYP:Tb3+,Eu3+ with high thermal stability.

Electronic structure and photoluminescence of Dy3+ single-doped and Dy3+/Tm3+ co-doped NaBi(WO4)2 phosphors

A single-phase white light emitting NaBi(WO4)2:Dy3+, Tm3+ phosphor has been successfully prepared by conventional high-temperature solid-state method. First-principles calculations were used to investigate the electronic structures of NaBi(WO4)2. The calculation results show that NaBi(WO4)2 has an indirect band gap with 3.02 eV. The crystal structure and PL properties of the obtained phosphor are characterized by SEM, powder X-ray and photoluminescence spectra, respectively. The results demonstrate that all as-prepared crystalline in a tetragonal crystal system with a space group of I4¯. PL results confirmed that the obtained phosphors can be efficiently excited by 365 nm and generated white light emission. Then the energy transfer between Dy3+ and Tm3+ in the host NaBi(WO4)2 was investigated. Finally, the chromaticity coordinates of preferred NaBi0.91-x(WO4)2:0.09Dy3+, 0.11 Tm3+ (0.3319, 0.3395) were close to the standard white light point (0.333, 0.333). All these results reveal that NaBi(WO4)2:Dy3+/Tm3+ was a potential single phase white light-emitting phosphor candidate for NUV-based w-LEDs.

Design and energy transfer mechanism for single-phased Gd2MgTiO6: Bi3+, Eu3+ tunable white light-emitting phosphors

In recent years, numerous efforts have been made to develop single-phased white light-emitting phosphors for the near-UV region to solve problems of color reabsorption and ratio regulation between different phosphors. In this work, we have designed Bi3+- and Eu3+-codoped single-phased Gd2MgTiO6 phosphors to achieve tunable white light emission based on multi-luminescence center energy transfer. The structural analysis showed that all the samples were crystallized as a monoclinic double perovskite with the P21/n symmetry space group (No. 14), with HRTEM images showing clear lattice fringes between the lattice planes. The single Bi3+-doped Gd2MgTiO6 sample exhibits two obvious emission peaks at 417 and 508 nm, which correspond to a characteristic 3P1 → 1S0 transition for the Bi3+ ions under near-UV excitation due to two types of Bi3+ emission centers, with their relative emission intensity depending closely on the value of the excitation wavelength. In this case, a suitable choice of excitation wavelength can achieve tunable emission for Gd2MgTiO6: Bi3+ between blue and green. Eu3+ is codoped into Gd2MgTiO6 as a red emission component and shows sharp emission lines that correspond to the characteristic 5D0 → 7FJ (J = 1, 2, 3, and 4) transitions of Eu3+ ions. Energy transfer in Gd2MgTiO6: Bi3+, Eu3+ has been confirmed by the electric dipole–dipole (d–d) interaction from Bi3+ to Eu3+. Our experiments show that it is straightforward to create tunable white light emission by adjusting the excitation scheme and Eu3+ concentration. Moreover, a schematic for the energy transfer mechanism and simplified spectral levels based on Bi3+ and Eu3+ ions has also been established.

Hedgehog ZnO/Ag heterostructure: an environment-friendly rare earth free potential material for cold-white light emission with high quantum yield

Solid-state white light emission from environment-friendly, highly stable hedgehog ZnO/Ag heterostructure has been observed for first time from a combined effect of tunability of emission centers and charge transfer. The heterostructure has been synthesized via a facile low-temperature hydrothermal route and characterized using X-ray diffractometer, scanning electron microscope and transmission electron microscope. The interaction between ZnO and Ag can be confirmed from the appearance of few new multi-phonon Raman peaks. Steady-state photoluminescence spectrum reveals multiple emissions (413, 453, 546, 605 and 667 nm) from virgin hedgehog ZnO at an excitation wavelength of 325 nm. Tuneability of radiative and non-radiative emission of ZnO which is the primary mechanism for white light emission (CIE coordinate: 0.35, 0.32) has been briefly investigated by time-correlated single-photon spectroscopy. Biocompatible as well cost-effectivity depicts that the as-prepared heterostructure would be a promising solid-state white light-emitting phosphor material for long-term use.

Ce3+ and Dy3+ doped Ca3(P1-xBxO4)2 phosphors for white light-emitting applications

A series of Ce3+, Dy3+ doped Ca3(P1-xBxO4)2 phosphors were synthesized by a high temperature solid-state reaction method, and their corresponding structure, morphology, and luminescence properties were investigated. It is found that the crystal phase transition from β-Ca3(PO4)2 to Ca5(PO4)3(OH) gradually occurs with increasing the boron content in the phosphors, which can provide various local environments for the doping ions and consequently affect the luminescence properties of the phosphors. A red shift of the emission peak of Ce3+ was revealed upon incorporation of boron into Ce/Dy co-doped phosphors. In addition, the luminescence properties could be well modulated by varying the excitation wavelength. The developed phosphors have great potential as a kind of single component white light-emitting phosphors for white light-emitting diodes.

Preparation and luminescence properties of white light-emitting phosphors LaAl2.03B4O10.54: Dy3+

A series of novel white light-emitting LaAl2.03B4O10.54: Dy3+ phosphors for light-emitting diode applications were synthesized by high-temperature solid-state reactions. The results of X-ray diffraction measurement indicate that the crystal structure of the phosphors is LaAl2.03B4O10.54. The photoluminescence spectra of Dy3+-doped samples under the excitation at 347 nm consist of two main groups of emission lines peaking at 480 and 571 nm, which can be assigned to the optical transitions 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 of Dy3+, respectively. Based on the recorded UV–visible diffuse reflectance spectra, the values of the optical band gaps of LaAl2.03B4O10.54 and La0.96Al2.03B4O10.54: 0.04 Dy3+ were ascertained to be 3.87 and 3.62 eV, respectively. The decay lifetimes decreases with the increasing doping concentration of Dy3+. The Commission International de I’Eclairage color coordinates of Dy3+-doped samples fall in the white region. The study about the photoluminescence spectra at rising temperature shows that our phosphors own excellent thermal stability. All these investigation results indicate that LaAl2.03B4O10.54: Dy3+ as white light-emitting phosphor has potential applications in white light-emitting diodes.

Synthesis and luminescence properties of double perovskite Ba2MgGe2O7:Mn4+ deep red phosphor

A deep red-emitting Ba2MgGe2O7:Mn4+ (BMG:Mn4+) phosphor was synthesized by conventional solid-state reaction. 4A2g→4T1g, 4A1g→4T2g, and 4A2g→2T2g transitions of Mn4+ ions resulted in three absorption bands centered at 305, 330, and 420 nm, respectively. The phosphor showed a broad emission band from 600 nm to 700 nm due to 2E→4A2 transition of Mn4+ ions. The highest luminous peak located at 660 nm, and the highest luminous intensity was achieved at high Mn4+ concentration (0.013). Multipolar interaction was the major mechanism for fluorescence quenching, and dipole–dipole interaction was the type of interaction mechanism between Mn4+ ions. Fluorescence lifetimes decreased from 0.898 ms to 0.746 ms, which accorded with the requirement of white light-emitting diode phosphor. Color coordinates of BMG:Mn4+ phosphors (0.721, 0.279) were close to the standard values of the National TV Standards Committee.

Crystal structure and luminescence property of a single-phase white light emission phosphor Sr3YNa(PO4)3F:Dy3+

A series of single-phase Sr3YNa(PO4)3F:Dy3+ phosphors were successfully synthesized via a conventional solid state reaction process. The powder X-ray diffraction patterns were utilized to confirm the phase composite and crystal structure. The phosphor could be excited by the ultraviolet visible light in the region from 300 to 420 nm, and it shown two dominant emission bands peaking at 484 nm (blue light) and 580 nm (yellow light) which originated from the transitions of 4F9/2→6H15/2 and 4F9/2→6H13/2 of Dy3+, respectively. The optimum dopant concentration of Dy3+ ions was confirmed to be 7 mol% in Sr3YNa(PO4)3F:Dy3+ system and the concentration quenching mechanism is dipole–dipole interaction. The lifetime values of Dy3+ ions at different concentrations (x = 0.03, 0.05, 0.07, 0.09 and 0.11) were determined to be about 0.855, 0.759, 0.686, 0.606 and 0.546 ms, respectively. The thermal stability of luminescence of Sr3YNa(PO4)3F:0.07Dy3+ phosphor was also investigated and the activated energy was deduced to be 0.228 eV, which shows good thermal stability. The chromaticity coordinates fall in the white-light region calculated by the emission spectrum. These results show that Sr3YNa(PO4)3F:Dy3+ phosphor can be a promising white emitting phosphor for white LEDs.