Temperature-dependent Emission Spectra Research Articles

A novel multifunctional double perovskite structure phosphor La2MgTiO6:Mn4+, Eu3+

A series of La2MgTiO6: Mn4+ and La2MgTiO6: Mn4+, Eu3+ phosphors were prepared by high-temperature solid-phase method. The emission spectra of La2MgTiO6: Mn4+, Eu3+ phosphor samples under 328 nm excitation overlap with the absorbing regions of plant phytochromes PR and PFR in the far red and near infrared double wavelength range. The temperature-dependent and wavelength-dependent emission spectra show that the two distinguishable emission peaks of Eu3+ and Mn4+ exhibit clearly different temperature and wavelength responses. Thus, dual-emission optical sensing based on changes in the fluorescence intensity ratio(FIR) of Mn4+ and Eu3+ ions, the relative sensitivity of wavelength detection in the range of 288–348 nm maxima is 8.13% nm−1 at 288 nm, and relative sensitivity of optical temperature sensing in the range of 298–498 K maxima is 2.09% K−1 at 498 K, In this study, La2MgTiO6: Mn4+, Eu3+ phosphor samples with very promising optical properties can provide the possibility of application in multiple fields.

Highly efficient far-red emitting Mn4+-activated Li3La3W2O12 phosphors for plant growth LED lighting

High-efficiency far-red emitting phosphors with an emission peak of around 730 nm are urgently needed for indoor plant growth light-emitting diode (LED) lighting. In this article, we report on the synthesis, crystal structure, and luminescence properties of a new highly efficient Mn4+ ion-activated Li3La3W2O12 (LLWO) far-red emitting phosphor. A group of LLWO:Mn4+ phosphors doped with different Mn4+ ion concentrations have been prepared via the conventional high-temperature solid-state reaction route. X-ray diffraction Rietveld refinement reveals that the LLWO:Mn4+ phosphor has the monoclinic structure with space group P21/n, along with lattice parameters of a = 5.5396 Å, b = 5.6026 Å, c = 7.8802 Å, α = γ = 90°, β = 90.0988°, and V = 244.57 Å3. Interestingly, LLWO:Mn4+ phosphors can generate bright narrowband far-red emission in the 650–800 nm wavelength range peaking at 719 nm due to the spin- and parity-forbidden 2Eg→4A2g transition of Mn4+ ions, matching well with the absorption spectrum of phytochrome PFR. The excitation spectrum monitored at 719 nm has a broad excitation band with the range from 250 to 550 nm centered at 339 nm and 472 nm, indicating that LLWO:Mn4+ phosphors could be efficiently pumped by both ultraviolet and blue LED chips. The highest far-red emission is achieved for the sample doped with 1.2 mol% Mn4+ ion, and this optimal LLWO:1.2%Mn4+ sample shows a high internal quantum efficiency of 88.4% and a decay lifetime of 2.289 ms. Commission Internationale de l’Eclairage (CIE) color coordinates of LLWO:1.2%Mn4+ are determined to be (0.7326, 0.2674). Besides, the crystal field analysis and temperature-dependent emission spectra of the as-prepared samples have been investigated in detail. The emission intensity of LLWO:1.2%Mn4+ sample at 423 K remains about 40% of that at 303 K. Finally, a LED device is fabricated by integrating the LLWO:1.2%Mn4+ phosphors and a 460 nm blue LED chip, which shows bright blue and far-red dual emission bands under 20–300 mA driving currents. This work demonstrates that these newly developed far-red emitting LLWO:Mn4+ phosphors have excellent application prospects in plant growth LED lighting.

Novel AMoO4:Eu3+ (A = Ca and Ba) optical thermometer: Investigation of effect of local ionic coordination environment on optical performance and temperature measurement sensitivity

A range of Eu3+-doped AMoO4 (A = Ca and Ba) phosphors were successfully synthetized, and their crystal structures, optical performance, and temperature measurement sensitivities were investigated in detail. Peak doping concentration of CaMoO4:Eu3+ phosphor was 0.18, while peak doping concentration of BaMoO4:Eu3+ phosphor may be greater than 0.18. Then, temperature-dependent photoluminescence emission spectra of representative CaMoO4:0.09Eu3+ and BaMoO4:0.03Eu3+ phosphors were recorded. CaMoO4:0.09Eu3+ phosphor exhibited abnormal thermal quenching, which was attributed to defects caused by heterovalent substitution of ions and increase in the temperature, and good thermal stability. Finally, the possibility of using both phosphors as optical thermometers was discussed, which exhibited good temperature sensitivity. However, CaMoO4:0.09Eu3+ phosphor exhibited two peak absolute (Sa, 1.28 %K−1 and 1.39 %K−1) and relative sensitivities (Sr, 1.21 %K−1 and 1.20 %K−1). In addition, variation trend of Sr value with temperature was considerably peculiar. Two optimum Sa and Sr values were attributed to abnormal thermal quenching of CaMoO4:0.09Eu3+ phosphor. Peak Sa and Sr values of BaMoO4:0.03Eu3+ phosphor was 12.39 %K−1 and 0.89 %K−1, respectively. In addition, Sa of AMoO4:Eu3+ phosphor was negatively related to Eu3+ central asymmetry, while peak Sr value was more inclined to appropriate ionic central asymmetry.

Quick and accurate optical thermometry based on chemometrics model strategy in Na0.5Gd0.5TiO3: Er3+

Current optical temperature measurements are confined to materials with high sensitivity, while probes with fluorescence intensity ratio (FIR) sensitivity above 12% K−1 still confront severe challenges. Therefore, we propose a novel strategy to obtain temperatures in one step from the temperature-dependent emission spectra by establishing a chemometrics model instead of calculating FIR values to improve temperature measurement accuracy of materials with a low FIR sensitivity. Here, Er3+-doped Na0.5Gd0.5TiO3 with low sensitivity and the monotonic variation of FIR is used as a temperature sensing material. The temperature-dependent spectra are preprocessed by the moving average filter method, and the useful information is extracted from the preprocessed spectra by the synergy interval partial least squares (siPLS) algorithm. The extracted spectra are then combined with the partial least squares regression (PLSR), the principal component regression (PCR), the multiple linear regression (MLR), and the support vector machine regression (SVM) respectively to build chemometrics models. The errors between the predicted and the actual temperatures of different models are evaluated to verify the feasibility of the proposed strategy and to select the optimal temperature measurement model for Na0.5Gd0.5TiO3: Er3+. The results show small errors and high correlation coefficients over 0.98 between the predicted and the actual temperatures of all models, indicating the applicability of the chemometrics model strategy in optical thermometry. Finally, the best model (a combination of siPLS-PCR + SVM) and the periodic testing of FIR with temperature may make Na0.5Gd0.5TiO3: Er3+ a candidate for optical thermometer with rapidity, durability and accuracy.

Optical temperature-sensing properties in La1.55SiO4.33:Yb3+,Ho3+ phosphors affected by Ho3+-doping concentration

In this paper, the Yb3+-Ho3+ co-doped La1.55SiO4.33 (LSO) phosphors were synthesized by the conventional solid-state reaction method. The phase purity and morphology of the samples were studied by XRD and SEM, respectively. Under 980 nm excitation, the upconversion (UC) luminescence of the LSO:Yb3+,Ho3+ phosphors was checked for different Ho3+ doping content and pump power. The corresponding UC mechanism was interpreted from the changing decay lifetimes and the energy transfer processes between Yb3+ and Ho3+ ions. Meanwhile, the temperature-dependent emission spectra were analyzed to learn the optical temperature-sensing behaviors with the fluorescence intensity ratio (FIR) method. The results revealed that the FIR (I658/I544) value increased when the temperature rose, which followed a linear function. The sensor sensitivity was evaluated, and the LSO:10%Yb3+,2%Ho3+ phosphor showed the highest absolute sensitivity. Besides, the main population way on 5F5 level of Ho3+ for red emission was clarified by the comparison of the UC spectra excited by continuous-wave and pulse light. Based on the above results, the LSO:Yb3+,Ho3+ phosphor can be considered as a new UC luminescent material for optical temperature sensors.

Multicolor tunable luminescence and energy transfer mechanism in Gd2O2S: Dy3+, Sm3+ phosphors

High quality single-phase multicolor emission phosphor is a prerequisite for efficient luminescence devices, but the system design and quantity preparation are still facing substantial challenges. Herein, Gd2O2S-based phosphors with high crystallinity, good dispersibility, and relatively good size uniformity were obtained by optimizing the type and components of flux based on the conventional solid-state method. By single-doping system study, the emission properties of matrix and activated ions are expounded, meanwhile the composition and co-excitation wavelength of co-doping system are designed. In the co-doping system, we mainly realized adjustable emission, interionic energy transfer, and application performance analysis. Firstly, multicolor emission in the range of yellow, orange and white was achieved through the modulation of dopant type and concentration as well as excitation wavelength. Secondly, the phenomena of spectral overlap (between Dy3+ and Sm3+), fluorescence intensity change (606 nm of Sm3+) and the monotonically decreasing fluorescence lifetime (Dy3+ at 578 nm) were evidence of energy transfer in the co-doping system. The theoretical fitting demonstrates that the energy transfer process of Dy3+→Sm3+ is primarily based on the quadrupole-quadrupole interaction mechanism. In addition, the cathodoluminescence spectra, temperature-dependent emission spectra, and magnetic properties tests have demonstrated the characteristics of multicolor adjustable emission (electron-beam excitation), excellent thermal stability, and good paramagnetic properties of the co-doping phosphors, further indicating that the Gd2O2S:Dy3+/Sm3+ system phosphors have potential as an excellent optical-magnetic bifunctional material in the fields of luminescence and bioimaging.

Design of a narrow-band blue-emitting Rb2Ba3(P2O7)2:Eu2+ phosphor with low thermal quenching for plant growth LEDs

Phosphor-converted light-emitting diodes (pc-LEDs) are commonly used to regulate the light environment to control the growth rates and improve the production efficiency of plant. Among them, the exploration of blue-emitting phosphors with high efficiency, low thermal quenching and excellent spectrum resemblance matching with the plant response spectrum is still challenging. Herein, a narrow-band blue-emitting Rb2Ba3(P2O7)2:Eu2+ phosphor with high color purity of 93.4% has been developed. Under 345 nm excitation, it exhibits a blue emission band centered at 413 nm with a full width at half-maximum (FWHM) of 36 nm, and the emission spectrum of Rb2Ba3(P2O7)2:0.060Eu2+ sample shows 85.7% spectrum resemblance with the absorption spectrum of chlorophyll-a in the blue region from 400 to 500 nm. In addition, the temperature-dependent emission spectra demonstrate that the Rb2Ba3(P2O7)2:0.060Eu2+ phosphor has good thermal stability and small chromaticity shift, with the emission intensity dropping to 72.5% at 423 K of the initial intensity at 298 K and a chromaticity shift of 38 × 10-3 at 498 K. All results suggest that the blue-emitting Rb2Ba3(P2O7)2:Eu2+ phosphor has potential application in plant growth LEDs.

Synthesis and characterization of a luminescent diphosphine and aromatic N-heterocyclic copper(I) coordination polymer

Luminescent Cu(I) complexes have drawn considerable attention as alternative materials to precious transition metal complexes due to their low cost and electron configuration. Discrete heteroleptic diamine-diphosphine copper(I) complexes have been investigated owing to their outstanding photophysical features. However, heteroleptic copper(I) coordination polymers remain mostly unexplored. Herein, we report the synthesis and photophysical characterization of a heteroleptic copper(I) coordination polymer by employing bidentate oxybis(2,1-phenylene)bis(diphenylphosphine) (POP) diphosphine and nitrogen heterocyclic 5-[4-(1-imidazolyl)phenyl]-2H-tetrazole (ipt) as ligands. By utilizing the mixed-solvent strategy, a one-dimensional (1D) linear chain was constructed under solvothermal reaction conditions. Temperature-dependent emission spectra combined with decay time measurements demonstrate that emission originated from triplet phosphorescence at ambient temperature.

Crystal growth and characterization of Eu2+-doped Cs2LiLaBr6 as a novel scintillator

In this work, a novel single crystal scintillator, Eu2+-doped Cs2LiLaBr6 (CLLB: Eu) with Ф12 mm × 50 mm, was successfully grown by the Bridgman method. The effects of substitution amount of europium ions on the crystal structure, luminescent properties and scintillation properties were systematically studied by fluorescence spectroscopy, XEL, decay kinetics, and temperature-dependent emission spectra. The Cs2LiLaBr6:2%Eu sample presents the highest light yield under X-ray excitation, which is about 235 times that of commercial BGO single crystals. The nanosecond decay lifetime of Eu2+ was observed in Cs2LiLaBr6:Eu crystal. The afterglow result indicates that the Cs2LiLaBr6: Eu crystal has a long afterglow and the afterglow mechanism of Cs2LiLaBr6: Eu crystal was proposed and constructed. It has a potent application in nuclear radiation detection and imaging as a scintillation long afterglow material.

A novel reddish-orange-emitting phosphor Ca3Gd7(PO4)(SiO4)5O2: Sm3+ for white light-emitting diodes

Phosphor is the decisive material in white light-emitting diodes (WLED), affecting light quality. Silica phosphate has good stability, low cost and environmentally friendly features, so it has great application potential. In this paper, a self-activated reddish-orange phosphor Ca3Gd7(PO4)(SiO4)5O2: xSm3+ was prepared by the high-temperature solid-phase method. The phase purity of the sample was verified by X-ray diffraction (XRD). The Rietveld refinement method was used to resolve further the sample structure and the location of the substitution of rare earth ions. The photoluminescence properties were studied in detail using fluorescence spectra, temperature-dependent emission spectra and other characterization methods. The electron transition and energy transfer processes of Gd3+ in Ca3Gd7(PO4)(SiO4)5O2 were analyzed. The fluorescence decay curve of the sample was obtained, which belongs to the double exponential curve, and the decay lifetime depending on the Sm3+ doping concentration was calculated. Furthermore, a WLED device was assembled, and warm white light was obtained, with a spectrum showing characteristic red emission, proving to complement the missing red component of commercial WLEDs. These results indicate that Ca3Gd7(PO4)(SiO4)5O2: xSm3+ phosphor has great potential for application.

A dual-functional platform for plant cultivation and wide-range optical thermometry based on vibration sidebands

Due to the Sb5+ substituted by Mn4+ at the 2c position of the [SbO6] octahedron, novel Sr2ScSbO6: Mn4+ (SSSO: Mn4+) phosphors showcased a broad excitation band in the range of 200–600 nm. In this respect, an intense far-red emission peak originating from the 2Eg → 4A2g spin-forbidden transition for SSSO: Mn4+ phosphors was observed under the 345 nm excitation. Furthermore, the temperature-dependent emission spectra exhibited excellent thermal stability (70.106% emission intensity remained at 423 K relative to 298 K). The feasibility of the fabricated LED device for potential plant cultivation was also examined. Furthermore, the different temperature reactions for anti-Stokes and Stokes sidebands of the SSSO: Mn4+ phosphors endowed the constructed luminescence intensity ratio (LIR) optical thermometry with an excellent relative sensitivity of 1.21% K−1@83 K in a wide-range (23–648 K). Finally, the sensing sensitivity based on the temperature-dependent decay curves was also analyzed.

Cross-relaxation induced efficient 1.55 μm emission in La1.95Er0.05Ti2O7 towards an application as an amplifier for silica-fibers

The La2-xErxTi2O7 samples (with x = 0 and 0.05) were synthesized using the conventional solid-state reaction method. The spectroscopic properties of the La2-xErxTi2O7 sample (x = 0.05) were investigated. The temperature-dependence emission spectra of La1.95Er0.05Ti2O7 display several lines in the visible and infrared regions. Under the excitation of a 488 nm laser, the La1.95Er0.05Ti2O7 exhibits efficient infrared emission at 1.55 μm. The intensity of emission bands arising from the transitions 4S3/2 → 4I15/2, 4I13/2 → 4I15/2 increase with increasing temperature. To explain the efficient emission at 1.55 μm, multiphonon-relaxation and energy transfer mechanism that contains cross-relaxation processes were proposed. Under a pump of 488 nm; La1.95Er0.05Ti2O7 could serve as an amplifier for silica fibers and can be used to fabricate green light-emitting displays.

Novel Sm3+/Eu3+ co-doped Sr7Sb2O12 red-emitting phosphor for white LED

Novel red-emitting phosphors Sr7Sb2O12: Sm3+ and Sr7Sb2O12: Sm3+, Eu3+ were successfully synthesized through a high temperature solid-state reaction method. The materials were characterized by X-ray diffraction patterns, scanning electron microscopy, Raman spectra, diffuse reflection spectra, photoluminescence excitation and emission spectra, luminescence decay curves and temperature-dependent emission spectra. The energy transfer between Sm3+ and Eu3+ ions in Sr7Sb2O12 was realized via electric quadrupole–quadrupole interaction with about 42.4% transfer efficiency. The phosphor exhibited good thermal stability with activation energy of 0.180 eV. Color coordinates and color purity of Sr7Sb2O12: 0.08Sm3+, 0.09Eu3+ was (0.620, 0.368) and 87.4% respectively. Combined the red phosphor with the near-UV or blue chips, the fabricated light emitting diode (LED) lamp emitted white light with Ra = 83.7 or 82.4 color rendering index (CRI) respectively. These results demonstrated that Sm3+/Eu3+ co-doped Sr7Sb2O12 red phosphor has a great potential application in white LED.

Unveiling the thermometric sensitivity of Eu3+ doped glasses in various system from theory to experimental

The thermometric sensitivity of the glasses in different Eu3+ doped glasses in different glass systems with different phonon energies and structures was obtained theoretically using the Judd-Ofelt parameters and compared to the experimental data obtained from the temperature dependent emission spectra. The purpose of the study was to test the limits of thermal sensitivity estimation from the Judd-Ofelt parameters in a wide selection of glass systems. We show, for the first time, the discrepancies in the theoretical and experimental values for the germanate and tellurite glasses due to their low phonon energies which cause the Boltzmann model to fail. The phosphate glasses, due to their high absolute thermometric sensitivity, are the promising materials as luminescence thermometer.

Preparation, structure and luminescent properties of P2O5–Gd2O3–Ga2O3–NaF–ZnO glasses co-doped with Tb3+ and Sm3+

White light-emitting diodes have been intensively explored as a technique of green energy-conversion in recent decades. In this work, a unique Tb3+/Sm3+ co-doped P2O5–Gd2O3–Ga2O3–NaF–ZnO glass consisting of Q0, Q1 and Q2 units was successfully synthesized. The DSC curves demonstrated that the glass stability gradually deteriorated with the increase of Sm3+ contents. The emission spectra exhibited the energy transfer from Dy3+ to Tb3+ ions, and the energy transfer efficiency and probability grew monotonously with the increase of Sm3+ contents. With the help of temperature-dependent emission spectra, the glasses were validated to be thermally stable. The fluorescence curves and Inokuti-Hirayama model demonstrated that the dominant mechanism in the energy transfer process was electric dipole-quadrupole interaction. In addition. the white-light emission with suitable chromaticity coordinates and CCTs could be obtained by adjusting the contents of the sensitizer and activator for PGGNZ glasses. All investigations revealed the potential application of Tb3+/Sm3+ co-doped glasses in optical device applications.

Large-scale synthesis, mechanism, and application of a luminescent copper hydride nanocluster.

Elucidating the structure-property relationships of ultra-small metal nanocluster with basic nuclear is of great significance for understanding the evolution mechanism in both the structures and properties of polynuclear metal nanoclusters. In this study, an ultra-small copper hydride (CuH for short) nanocluster was simply synthesized with high yield, and the large-scale preparation was also achieved. Single crystal X-ray diffractometer (SC-XRD) analysis shows that this copper NC contains a tetrahedral Cu4 core co-capped by four PPh2Py ligands and two Cl in which the existence of the central H atom in tetrahedron was further identified experimentally and theoretically. This CuH nanocluster exhibits bright yellow emission, which is proved to be the mixture of phosphorescence and fluorescence by the sensitivity of both emission intensity and lifetime to O2. Furthermore, the temperature-dependent emission spectra and density functional theory (DFT) calculations suggest that the luminescence of CuH mainly originates from the metal-to-ligand charge transfer and cluster-centered triplet excited states. This work offers new insights into understanding the structure-property relationship of basic nuclear CuH nanocluster.

Optical temperature-sensing phosphors with high sensitivities in a wide temperature range based on different strategies.

Rare earth ion doped luminescent materials are considered potential candidates with a wide range of applications because of their unique optical characteristics. In this work, single-phase Yb3+-Er3+ and Yb3+-Tm3+ co-doped La1.55SiO4.33 (LS) phosphors of a hexagonal system for optical thermometers are reported. Three characteristic emissions of Er3+ were observed at 521, 553 and 659 nm in the LS:Yb3+,Er3+ phosphors under 980 nm excitation, which are assigned to the 2H11/2 → 4I15/2, 4S3/2 → 4I15/2 and 4F9/2 → 4I15/2 transitions, respectively. In the LS:Yb3+,Tm3+ phosphors, one can find two strong emissions at 474 and 790 nm and two weak emissions at 648 and 685 nm. Their upconversion (UC) luminescence mechanisms were studied from their pump-power-dependent spectra. When the samples were measured at various temperatures, their spectral features revealed that different fluorescence intensity ratio (FIR) strategies can be used to characterize their optical temperature-sensing behaviors. The sensor sensitivities were determined from the temperature-dependent UC emission spectra using thermally coupled energy levels (TCELs) and non-TCELs, which had improved compared with those of some other reported optical temperature-sensing luminescent materials. The device fabrication indicated that the developed UC phosphors are promising for applications in optical thermometers.

Spectroscopic characterization of Eu3+-doped KSrYSi2O7 phosphor for NUV LEDs: Estimation of the Judd Ofelt parameter

In this study, a series of Eu3+-doped KSrYSi2O7 phosphors were synthesized by employing the conventional combustion method. Phase confirmation revealed that the synthesized phosphor had a monoclinic structure with the P21/m phase group. For studying the effect of doping on the bandgap, the effect has been observed by applying the Kubelka-Munk function. The emission profile of the synthesized phosphor was recorded by stimulation with radiation of 239 nm. The recorded profile reveals the characteristics of the Eu3+ ions, which are concomitant with the f-f transitions. In addition, studying the quenching phenomenon, optical transition parameters corresponding to the Eu3+ ions were estimated using the Judd-Ofelt theory to validate the local symmetry properties. The thermal stability of the synthesized phosphor was also thoroughly studied. The temperature-dependent emission spectra of the prepared phosphors revealed the good thermal stability of the present phosphors, with a high activation energy of around 0.24 eV. The excellent color purity of 90.4% and thermal stability, along with the Commission International del’Eclairage (CIE) coordinates of (x = 0.551 and y = 0.436), suggest the suitability of the phosphor for use in different light-emitting applications.

Crystal Structure, Raman Spectrum and Tl+ Lone-Pair Luminescence of Thallium(I) Dodecahydro-Monocarba-closo-Dodecaborate Tl[CB11H12

Tl[CB11H12] was prepared with a reaction of Tl2[CO3] with the acid of the monocarba-closo-dodecaborate anion (H3O)[CB11H12] in aqueous solution as prismatic colorless single crystals by isothermal evaporation from the clear brine. It crystallizes in a monoclinic primitive structure with the space group P21/c (a = 685.64(3) pm, b = 1978.21(9) pm, c = 1006.89(5) pm, β = 132.918(3)° for Z = 4), which can be derived from the halite-type arrangement if the closo-carbaborate cages are considered as spheres. Due to the different atoms in the [CB11H12]− anion, Tl[CB11H12] features interesting C–Hδ+ ∙∙∙ δ−H–B interactions near to non-classical hydrogen bridges (“dihydrogen bonds”) and exhibits considerably different luminescence properties compared to regular closo-hydroborates, such as Tl2[B10H10], Tl2[B12H12] and Tl3Cl[B12H12]. Tl[CB11H12] shows strong photoluminescence (PL) at 390 nm, while the excitation bands for this broad band are located at 245 and 280 nm. It is caused by an interconfigurational [Xe]4f145d106s2 (3P1) to [Xe]4f145d106s16p1 (1S0) transition, which is also known as lone-pair luminescence. The quantum yield is rather low (<10 %), which is likely caused by the rather large Stokes shift. In addition, temperature-dependent emission spectra were recorded to determine the thermal quenching curve and the respective quenching temperature.

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.