Quadrupole-quadrupole Interaction Research Articles

Resonance interaction between two entangled gravitational polarizable objects

We investigate the resonance quadrupole-quadrupole interaction between two entangled gravitationally polarizable objects induced by a bath of fluctuating quantum gravitational fields in vacuum in the framework of linearized quantum gravity. Our result shows that, the interaction energy behaves as r^{-5} in the near regime, and oscillates with a decreasing amplitude proportional to r^{-1} in the far regime, where r is the distance between the two objects. Compared to the case when the two objects are in their ground states, the quantum gravitational interaction is significantly enhanced when the objects are in an entangled state. Remarkably, in the far regime, the resonance quantum gravitational interaction can give the dominating quantum correction to the Newtonian potential, since the extremum is much greater than the monopole-monopole quantum gravitational interaction.

Sensitization of Tb3+ and Dy3+ emission in Li4Ca(BO3)2 via energy transfer from Ce3+ and study of energy transfer mechanism

Different series of Li4Ca(BO3)2 singly doped with Ce3+, Tb3+ and Dy3+ as well as codoped with Ce3+-Tb3+ and Ce3+-Dy3+ pairs were prepared by a one-step solid state reaction method. Structural, optical and photoluminescence (PL) properties were studied in detail. The powder X-ray diffraction studies confirmed a single-phased structure with an orthorhombic structure (Pnnm). Vibrational modes of the BO3 groups were determined using Fourier Transform Infrared spectra. The band gap value of 4.98 eV was determined from the UV–vis diffuse reflectance spectroscopy data. The PL of the single and codoped systems were investigated in detail. There was a significant quantitiy of spectral overlap between the emission spectrum of the Ce3+ and the excitation spectra of Tb3+/Dy3+, which showed the possibility of energy transfer from the Ce3+ to the Tb3+/Dy3+. Effective sensitization of the Tb3+ and Dy3+ emission was achieved via energy transfer from Ce3+ in the Li4Ca(BO3)2. The energy transfer mechanism revealed that Ce → Tb energy transfer occured via an electric quadrupole-quadrupole interaction, whereas Ce → Dy energy transfer occured via amn electric dipole-dipole interaction. The prepared materials can act as a strong candidate for near-ultraviolet light emitting diodes and display applications.

Broadband near-infrared luminescence and energy transfer of Cr3+, Ce3+ co-doped Ca2LuHf2Al3O12 phosphors

Broadband near-infrared phosphors are highly desirable for food testing. Targeted Ca2LuHf2Al3O12:Cr3+ (CLHA:Cr3+) and Ca2LuHf2Al3O12:Ce3+,Cr3+ (CLHA:Ce3+,Cr3+) phosphors were synthesized by the conventional high-temperature solid state reaction. The CLHA:Cr3+ phosphor, with a good thermal stability, shows a red shift owing to radiation reabsorption and non-radiative transition with increasing Cr3+ content. For co-doped sample, the emission intensity of Cr3+ can be enhanced by three times due to the energy transfer from Ce3+ to Cr3+, which can be evidenced by a significant overlap between the PLE of Cr3+ single-doped phosphor and the PL of Ce3+ single-doped phosphor. In addition, the mechanism of energy transfer is identified as a quadrupole-quadrupole interaction according to decay lifetime and Dexter's energy transfer formula. The broadband NIR emission peaked at 775 nm of CLHA:Cr3+,Ce3+ phosphor shows a bright prospect in nondestructive quality-control analysis systems for food.

Near-UV-pumped yellow emitting through energy transfer in Sr3NaY(PO4)3F:Ce3+, Mn2+ phosphors

Single-phased Sr3NaY(PO4)3F:Ce3+, Mn2+ phosphors were synthesized by solid-state reaction method. The X-ray powder diffraction (XRD), photoluminescence (PL) spectrum and energy transfer from Ce3+ to Mn2+ of the samples were investigated. The PL spectrum of Sr3NaY(PO4)3F:Ce3+, Mn2+ show there is a wide hump in the range of 300 to 450 nm of Ce3+ ions and characteristic peak of Mn2+ ions. The emission intensity of Mn2+ increased and that of Ce3+ decreased with increasing Mn2+ concentration. The color-tunable of the Sr3NaY(PO4)3F:Ce3+, Mn2+ phosphors adjust from blue to yellow by changing the Mn2+ doping concentration. The decay curves show that energy transfer mechanism between Ce3+ and Mn2+ is quadrupole-quadrupole interaction. Moreover, the Sr3NaY(PO4)3F:Ce3+, Mn2+ phosphors exhibit excellent thermal stability. Based on obtained results, the Sr3NaY(PO4)3F:Ce3+, Mn2+ phosphors can act as efficient candidate phosphors materials for NUV-pumped white light-emitting diodes.

A double perovskite-based red-emitting phosphor with robust thermal stability for warm WLEDs

Red-emitting Ba2YSbO6:Eu3+ phosphors with double perovskite structure have been prepared by solid-state method. Phase structures, photoluminescence properties, and thermal stability performances have been investigated in detail. The prepared phosphors reveal a cubic phase with the space group of Fm-3m. They exhibit a doughty red emission band at 612 nm ascribed to the Eu3+:5D0→7F2 transition under 393 and 465 nm excitation. The samples have high concentration quenching property with the optimal concentration reached to 70 mol%, deriving from the quadrupole-quadrupole interaction. Additionally, the Ba2YSbO6:Eu3+ phosphors demonstrate robust thermal performance with the emission intensity retaining 78.8% at 423 K of that at 303 K. Ultimately, the phosphor-converted LED device is fabricated by combining the red-emitting Ba2YSbO6:Eu3+ phosphor and YAG:Ce3+ yellow ones to a blue chip (460 nm), which exhibits a warm white light with color rendering index(CRI) of 80.8 and correlated color temperature (CCT) of 5184 K.

Extension of Cubic-Plus-Polar (CPP) equation of state (EoS) for application in aqueous electrolyte solutions

In this study, an extension of Cubic-Plus-Polar (CPP) equation of state (EoS), i.e. electrolyte CPP (eCPP), was proposed to study various aqueous binary electrolyte solutions as well as water-CO2-NaCl, water-CO2-Na2SO4, and water-H2S-NaCl ternary systems. To avoid complexity, polar (dipole-dipole, quadrupole-quadrupole, and dipole-quadrupole) interactions were only considered for water, CO2, and H2S components, not for the studied ionic species in electrolyte solutions. In this work, the long-range electrostatic contribution was taken into account by Pitzer-Debye-Huckel equation. The proposed model has three adjustable parameters for each electrolyte, which were determined by fitting to experimental mean activity coefficient and liquid molar volume data of 79 aqueous strong electrolyte solutions at 0.1 MPa and 298.15 K. The overall average absolute relative deviation (AARD) between model-calculated values and experimental data were 1.05% and 1.44% for liquid molar volume and mean activity coefficient, respectively, while this value was 1.27% for predicted results of osmotic coefficient. Moreover, eCPP EoS predicted the liquid molar volumes of 15 different electrolyte solutions with an overall AARD of 0.6% in a wide range of pressure, temperature, and electrolyte concentration. The reliability of the proposed EoS (eCPP) was verified by the obtained AARDs.

Colour-tunable luminescence and thermal stability of blue-green emitting Ba2MgSi2O7: Ce3+, Tb3+ phosphors

A series of Ba2MgSi2O7: Ce3+ and Ba2MgSi2O7: Ce3+, Tb3+ phosphors were successfully prepared using solid state reaction method. The XRD and FESEM results revealed that the prepared samples have a tetragonal crystal structure and the particles have irregular shapes and different size distributions. The Photoluminescence properties illustrate that Ce3+ doped Ba2MgSi2O7 (BMS) phosphors produced a broad single peak at the wavelength 435 nm under the excitation wavelength 326 nm. BMS: Ce3+, Tb3+ phosphors showed emissions bands for Ce3+ ion as well as Tb3+ ion under the excitation wavelength 252 nm. The energy transfer from Ce3+ to Tb3+ ion was investigated in detail. The emission colors were tuned from blue to green with the increase of Tb3+ concentration in BMS: 1.5 mol% Ce3+ phosphors. The energy transfer from Ce3+ to Tb3+ ions was ascribed to quadrupole-quadrupole interaction. The prepared phosphor showed an excellent thermal stability.

Tunable white light emission in zinc phosphate glasses activated with [formula omitted] clusters and Sm3+

Zinc phosphate glasses, activated with Agmn+ clusters and Sm3+, were prepared by the conventional melt-quenching method. The X-ray diffraction patterns revealed that the samples remain amorphous for Ag and Sm3+ contents up to 3.0 and 1.0 mol%, respectively. The Raman and FTIR spectra showed that the main vibrational modes are associated with P–O bonds. The absorption coefficient spectrum of the Ag singly doped glass sample displayed a broad band centered at 318 nm, related to Agmn+ clusters, whereas those co-doped with Sm3+ showed, in addition to the Agmn+ cluster absorption, the well-known Sm3+ absorptions at 343, 360, 374, 401, 415, 438, 465 and 477 nm. The photoluminescence excitation spectrum of the Ag singly doped glass sample exhibited a broadband from 3 to 6 eV (207–413 nm), assigned to superposition of the Ag+: 4 d10 → 4d95s and Agmn+ cluster: S0 → S1 transitions, being the excitation into the Agmn+ clusters attractive for W-LEDs applications. The photoluminescence emission spectra of the Ag singly doped glass sample, upon Agmn+ cluster excitations at 340, 350 and 360 nm, displayed cold white light tonality, with (0.279, 0.300) CIE1931 chromaticity coordinates of 9453 K and bluish-white light tonality with (0.264, 0.276) and (0.259, 0.270) CIE1931 chromaticity coordinates and correlated color temperature values of 12901 and 14201 K, respectively. The global emission of the Ag and Sm3+ co-doped glass samples was, upon 340, 350 and 360 nm excitations, gradually tuned from the bluish and cold white region to the warm white one, as the Sm3+ content was increased, with correlated color temperatures in the 14201-2691 K range. The Sm.3+ emission bands, under excitations at 340 and 350 nm, were attained at expense of radiative and non-radiative energy transfer from the Agmn+ clusters, as revealed respectively by the sinks mounted on the Agmn+ cluster emission bands and the emission decay profile shortening in presence of Sm3+. Analysis of the Agmn+ cluster emission intensity and decay profiles, with the Dexter and Burstein models, showed that Agmn+ cluster cross-relaxation and/or non-radiative energy transfer to Sm3+ might be dominated by an electric quadrupole-quadrupole interaction.

Effect of Eu3+ ion concentration on the structural and photoluminescence properties of Ba1.3Ca0.7SiO4 ceramic-based red phosphors for solid-state lighting applications

In this study, Ba1.3Ca0.7SiO4: Eu3+ red-orange phosphors were synthesized by the solution combustion method. The effect of varying Eu3+ molar percentages on the material properties including its intrinsic quantum efficiency (IQE) was investigated. XRD results showed synthesized phosphor is hexagonal T-phase Ba1.3Ca0.7SiO4 and the average crystallite size calculated using the Scherer’s formula was estimated to be ∼33 nm. SEM result showed the synthesized Ba1.3Ca0.7SiO4: Eu3+ phosphor had granular shaped and slightly agglomerated particles. The EDS shows that prepared samples contain Ba, Ca, Eu, Si, and O as expected. UV–vis measurement confirms the percent reflectance in the UV- region to be dependents on Eu3+ ions and the estimated bandgap vary between 3.80 and 4.23 eV. Photoluminescence emission measurements of all prepared samples at room temperature appeared to be entirely from inter configurational Eu3+ emission and depend both on the site symmetry as well as ion concentration. Hence, the peak centred at 592 nm is due to transition 5D0 →7F1, while the peak centred at 615 nm is due to transition 5D0 →7F2. The quadrupole-quadrupole multipolar interaction was found to be exclusively responsible for luminescence quenching. The Judd-Ofelt intensity parameters (Ω2, Ω4), asymmetry ratio (R0), and average decay lifetime of the nanocrystals showed dependence on concentration. High IQE values were obtained at low Eu3+ ion concentrations but the efficiency decreased with increasing ion concentration. The CIE color coordination confirmed that the emitted color fall in the strong orange-red region of the emission spectrum.

Quadrupolar interactions between acceptor pairs in p -doped semiconductors

We consider the interaction between acceptor pairs in doped semiconductors in the limit of large inter-acceptor separation relevant for low doping densities. Modeling individual acceptors via the spherical model of Baldereschi and Lipari, we calculate matrix elements of the quadrupole tensor between the four degenerate ground states and show that the acceptor has a nonzero quadrupole moment. As a result, the dominant contribution to the large-separation acceptor-acceptor interaction comes from direct (charge-density) terms rather than exchange terms. The quadrupole is the leading nonzero moment, so the electric quadrupole-quadrupole interaction dominates for large separation. We calculate the matrix elements of the quadrupole-quadrupole interaction Hamiltonian in a product-state basis and diagonalize, obtaining a closed-form expression for the energies and degeneracies of the sixteen-state energy spectrum. All dependence on material parameters enters via an overall prefactor, resulting in surprisingly simple and universal results. This simplicity is due, in part, to a mathematical happenstance, the nontrivial vanishing of a particular Wigner 6-j symbol. Results are relevant to the control of two-qubit interactions in quantum computing implementations based on acceptor spins, as well as calculations of the thermodynamic properties of insulating p-type semiconductors.

Multicolor tunable luminescence and energy transfer of core-shell structured SiO2@Gd2O3 microspheres co-activated with Dy3+/Eu3+ under single UV excitation.

Optimizing structure and varying doped ions are two main strategies to obtain excellent luminescence performance. Spherical morphology is considered to be the most ideal phosphor structure due to the least surface defects. Herein, a series of spherical and monodispersed Dy3+/Eu3+ co-activated SiO2@Gd2O3 core-shell phosphors with multicolor tunable luminescence were successfully prepared via a facile urea assisted precipitation method. Related chemical reactions and the possible growth mechanism of Gd2O3:Ln3+ directional deposition on the surface of SiO2 microspheres were put forward. Upon 273 nm UV radiation excitation, SiO2@Gd2O3:Dy3+ and SiO2@Gd2O3:Eu3+ samples exhibited characteristic yellow (4F9/2-6H13/2) and blue (4F9/2-6H15/2) emissions of Dy3+ and red (5D0-7F2) emission of Eu3+, respectively. Meanwhile, multicolor emissions (warm white, yellow and orange) could be easily obtained by modulating the relative content of Dy3+ and Eu3+ in SiO2@Gd2O3:Ln3+ samples under a single excitation wavelength. Moreover, it was confirmed that Dy3+ could transfer energy to Eu3+ in the form of quadrupole-quadrupole interaction and further improved the luminescence intensity of Eu3+ by comparing experimental data with theoretical calculations. These results imply that tunable luminescence Dy3+,Eu3+ co-doped SiO2@Gd2O3 microspheres have great potential applications in multicolor displays and biolabeling fields.

Energy transfer and white luminescence in Bi3+/Eu3+ co-doped oxide glasses

Bi3+/Eu3+-doped SiO2–Al2O3–CaO–B2O3–La2O3–K2O glasses were fabricated and the luminescent properties, energy transfer as well as thermal stability were systematically investigated. Under 333 nm light excitation, bluish-green luminescence centered at 480 nm is observed in the obtained Bi3+-doped glass. By co-doped with Eu3+, highly efficient energy transfer process happens from Bi3+ to Eu3+ via a quadrupole-quadrupole interaction. The energy transfer efficiency can reach 86% and the concentration of Eu3+ is not quenched in here. With increasing Eu3+ concentration, tunable luminescence from bluish-green via white to orange-red is realized. Significantly, pure white light emission with CIE coordinates (0.348, 0.333) is obtained when excited by 333 nm light. Temperature-dependent emission spectra present superior color stability in operating temperature lower than 423 K for the prepared glasses. These results indicate that these glasses are potential white light emitting materials for organic-resin-free W-LEDs.

Mediation of Electron Transfer by Quadrupolar Interactions: The Constitutional, Electronic, and Energetic Complementarities in Supramolecular Chemistry.

SummaryStudies of intermolecular interactions enhance our knowledge of chemistry across molecular and supramolecular levels. Here, we show that host-guest quadrupolar interaction has a profound influence on the molecular system. With covalently bonded dimolybdenum complex units as the electron donor (D) and acceptor (A) and a thienylene group (C4H2S) as the bridge (B), the mixed-valence D-B-A complexes are shaped with clefts in the middle of the molecule. Interestingly, in aromatic solvents, the D-A electronic coupling constants (Hab) and electron transfer rates (ket) are dramatically reduced. Theoretical computations indicate that an aromatic molecule is encapsulated in the cleft of the D-B-A array; quadrupole-quadrupole interaction between the guest molecule and the C4H2S bridge evokes a charge redistribution, which increases the HOMO-LUMO energy gap, intervening in the through-bond electron transfer. These results demonstrate that a supramolecular system is unified underlying the characteristics of the assembled molecules through constitutional, electronic, and energetic complementarities.

Electronic structure, energy transfer mechanism and thermal quenching behavior of K3YB6O12:Dy3+, Eu3+ phosphor

Rare-earth ions activated K3YB6O12:Dy3+, Eu3+ phosphors were successfully prepared by a high temperature solid state reaction. The electronic structure of K3YB6O12 was estimated by density functional theory. Under the excitation of ultraviolet light, K3YB6O12:Dy3+ presented two main emission bands with peaks at 487 nm and 576 nm, belonging to 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions respectively. The variable emitting color was observed after co-doping with Eu3+ associated with the energy transfer between Dy3+ and Eu3+, which was confirmed by analyzing the photoluminescence spectra and the luminescence decay curves. Using the Dexter's theory and the Reisfeld's approximation, the energy transfer process from Dy3+ to Eu3+ can be explained by quadrupole-quadrupole interaction. Furthermore, the temperature dependent emission spectra of K3YB6O12:Dy3+, Eu3+ confirmed that the luminous intensity of 576 nm at 493 K was 78% of the initial value, suggesting the good emission thermal stability. It was worth noting that as the temperature increases, the emission intensity of Eu3+ hardly changed, which was different with that of Dy3+. Different thermal quenching phenomena of Dy3+ and Eu3+ were depicted in the coordinate graphics.

Electromagnetic properties of neutron-rich Ge isotopes * * Supported by National Natural Science Foundation of China (11875188), Open Project Fund of Shanghai Key Laboratory of Particle Physics and Cosmology (18DZ2271500-2), Sichuan Science and Technology Program (2019JDRC0017), and the Doctoral Program of Southwest University of Science and Technology (18zx7147)

The electric quadrupole moment and the magnetic moment (or the factor) of low-lying states in even-even nuclei 72-80Ge and odd-mass nuclei 75-79Ge are studied in the framework of the nucleon pair approximation (NPA) of the shell model, assuming the monopole and quadrupole pairing plus quadrupole-quadrupole interaction. Our calculations reproduce well the experimental values of and for 72,74,76Ge, as well as the yrast energy levels of these isotopes. The structure of the states and the contributions of the proton and neutron components in and are discussed in the -pair truncated shell-model subspace. The overall trend of and as a function of the mass number , as well as their signs, are found to originate essentially from the proton contribution. The negative value of in 72,74Ge is suggested to be due to the enhanced quadrupole-quadrupole correlation and configuration mixing.

Phase equilibria modeling of polar systems with Cubic-Plus-Polar (CPP) equation of state

In this study, an equation of state (EoS), Cubic-Plus-Polar (CPP), has been constructed to model phase equilibria of polar and practical systems in a wide range of temperatures and pressures. In the proposed model, Soave-Redlich-Kwong (SRK) EoS takes into account dispersive forces while a set of polar terms was employed to account for dipolar and quadrupolar interactions. By applying these terms, dipole-dipole, dipole-quadrupole, and quadrupole-quadrupole interactions were directly taken into consideration. The CPP EoS with four pure-compound parameters could accurately correlate both vapor pressure and saturated liquid molar volume of studied pure compounds (water, methanol, ethanol, propanol, 2-propanol, 2-butanol, acetone, N-methyl-2-pyrrolidone (NMP), CO2, and H2S). By utilizing two temperature-dependent binary interaction parameters (BIPs), the phase equilibria of binary mixtures including water-CO2, water-H2S, CO2–H2S, methanol-CO2, ethanol-CO2, propanol-CO2, acetone-CO2, water-acetone, ethanol-acetone, water-NMP, 2-propanol-NMP, and 2-butanol-NMP were satisfactorily calculated by the model. Moreover, the proposed model is sufficiently efficient which is capable of representing minimum water mole fraction in the nonaqueous phase of water-CO2 and water-H2S mixtures. Additionally, the CPP EoS accurately predicted the saturated and single phase mixtures densities of water-CO2 mixture. Finally, the solubility values of CO2 and H2S mixtures in water were reasonably predicted by the model.

Effective axial-vector strength within proton-neutron deformed quasiparticle random-phase approximation

We use the available experimental Gamow-Teller ${\ensuremath{\beta}}^{\ensuremath{-}}$ and ${\ensuremath{\beta}}^{+}$/EC (electron-capture) decay rates between ${0}^{+}$ and ${1}^{+}$ ground states in neighboring even-even and odd-odd nuclei, combined with $2\ensuremath{\nu}\ensuremath{\beta}\ensuremath{\beta}$ half-lives, to analyze the influence of the nuclear environment on the weak axial-vector strength ${g}_{\mathrm{A}}$. For this purpose, the proton-neutron deformed quasiparticle random-phase approximation (pn-dQRPA), with schematic dipole residual interaction is employed. The Hamiltonian contains particle-hole (ph) and particle-particle (pp) channels with mass-dependent strengths. In deriving the equations of motion we use a self-consistent procedure in terms of a single-particle basis with projected angular momentum provided by the diagonalization of a spherical mean field plus the quadrupole-quadrupole interaction. Our analysis evidenced a quenched average effective value $\ensuremath{\langle}{g}_{\mathrm{A}}\ensuremath{\rangle}\ensuremath{\approx}0.7$ with a root-mean-square deviation of $\ensuremath{\sigma}\ensuremath{\approx}0.3$ for transitions from even-even emitters and $\ensuremath{\sigma}\ensuremath{\approx}0.6$ for transitions from odd-odd emitters.

Efficient Mediation of Electron Transfer Pathway by Quadrupolar Interactions: The Constitutional, Electronic and Energetic Complementarities in Supramolecular Chemistry

SummaryOur knowledge on the chemistry across molecular and supramolecular levels is insufficient. Here, we show that inclusion of a guest molecule through quadrupolar interactions leads to a chemical transformation of the molecular system. With covalently bonded dimolybdenum complex units as the electron donor (D) and acceptor (A) and a thienylene group (C4H2S) as the bridge (B), the mixed-valence D-B-A complexes are shaped with clefts in the middle of the molecule. The D-A electron transfer is optically studied under the Marcus-Hush theoretic framework. It is found that in aromatic solvents, the electronic coupling matrix elements (Hab) and electron transfer rate constants (ket) are dramatically reduced. DFT calculations and electrostatic potential map analysis indicate that in the solution, an aromatic molecule is encapsulated in the cleft of the D-B-A array; quadrupole-quadrupole interaction between the guest molecule and the C4H2S group evokes charge redistribution, which increases the HOMO-LUMO energy gap, intervening in the through-bond electron transfer. These results demonstrate that a supramolecular system is unified underlying the characteristics of the assembled molecules through constitutional, electronic and energetic complementarities, thus, sharing the general principles developed in molecular chemistry. This study illustrates the role of site-specific interactions of the aromatic residues in biological systems in governing the charge transfer processes.

Understanding nuclear dynamics in the SD-pair shell model: From pre-vibration to collective rotation

Influences of some important residual interactions considered in the shell model on nuclear dynamics and the shape phase evolution have been investigated in the SD-pair shell model for an identical nucleon system. The results indicate that the collective modes including the spherical vibration, prolate rotation, and X(5)-like critical dynamics are mainly driven by the competition between the monopole-pairing interaction and the quadrupole-quadrupole interaction, and the main features of the U(5)-SU(3) phase transition can be well reproduced within the SD-pair model. In addition, it is also shown that the quadrupole-pairing interaction cannot be ignored in reproducing an ideal rotational spectrum with a realistic single-particle configuration.

An abnormal yellow emission and temperature-sensitive properties for perovskite-type Ca2MgWO6 phosphor via cation substitution and energy transfer

A series of Ca2MgWO6:Bi3+, Eu3+ phosphors were prepared via a high temperature solid-state reaction method. The crystal structure of Ca2MgWO6:Bi3+, Eu3+ phosphors adopt the double perovskite structure. Different from previous study, a yellow-emitting was observed in the Ca2MgWO6 matrix. Roman spectrum indicated that the yellow emission is a result of the existence of oxygen vacancies during the preparation process. By co-doping Bi3+ into Ca2MgWO6 matrix, the yellow emission was enhanced due to the more defect concentration and the 3P1-1S0 transition of Bi3+. Two strategies containing cation substitution and energy transfer in single Ca2MgWO6 compound were used to tune photoluminescence properties. Bi3+ and Eu3+ as substitution ions were co-doped into Ca2MgWO6 matrix and the energy transfer from Bi3+ to Eu3+ caused the tunable emission color from yellow to deep red. The energy transfer mechanism from Bi3+ to Eu3+ ions has been defined to be a quadrupole-quadrupole interaction in our work. Notably, the Bi3+ and Eu3+ in this system showed excellent temperature sensing properties owing to different luminescent thermal quenching behaviors of Bi3+ and Eu3+ in the range of 298–523 K. In addition, the maximum values for absolute (Sa) and relative (Sr) sensitivities were calculated to be 0.961 K-1 (523 K) and 8.52% K−1 (323 K), respectively, which validates the possibility of optical thermometric applications of Ca2MgWO6:Bi3+, Eu3+ phosphors.