The electronic structure and photoluminescence properties of Ca2GeO4:Eu3+ in ultraviolet and vacuum ultraviolet region

Zhang, Jiachi; Zhou, Meijiao; Qin, Qingsong; Yu, Minghui; Wang, Yuhua

doi:10.1016/j.jlumin.2011.04.006

Cited by 23 publications

(9 citation statements)

References 24 publications

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“…These four excellent optical-function oxides with d 10 electron configuration are probably applied in water splitting and the photoluminescent field [9,10,[18][19][20]. Subsequently, structures and morphologies of these oxides were confirmed by X-ray powder diffraction, scanning electron microscopy, Raman spectroscopy and infrared spectroscopy, respectively.…”

Section: Introductionmentioning

confidence: 93%

“…Up to now, different methods have been employed to prepare various nanostructural materials, such as chemical vapor deposition [6], solid-state reaction method [7], solgel [8], and other methods [9,10]. As we know, CaGa 2 O 4 , Ca 2 GeO 4 , CaIn 2 O 4 , and CaSnO 3 were generally synthesized by the solid-state reactions, which needed high temperature, long reaction time due to the high demand of activation energy, and the difficulty in migration of the reactants.…”

Section: Introductionmentioning

confidence: 99%

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Vibrational spectra of CaGa2O4, Ca2GeO4, CaIn2O4 and CaSnO3 prepared by electrospinning

et al. 2012

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CaGa 2 O 4 nanofibers, Ca 2 GeO 4 microfibers, CaIn 2 O 4 nanorods, and CaSnO 3 nanofibers were synthesized by using an electrospinning technique. Structures and morphologies of the as-synthesized oxides were characterized by X-ray diffraction and scanning electron microscopy, respectively. Raman and infrared spectra were also recorded and analyzed at room temperature. More significantly, nuclear site group analysis was carried out and the number of normal vibrational modes, Raman-active, and infraredactive optical phonon modes were obtained by theoretical calculation. Finally, vibrational assignments of the observed Raman peaks and infrared absorption bands were given based on the group theoretical analysis and experimental data from literature.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Vibrational spectra of CaGa2O4, Ca2GeO4, CaIn2O4 and CaSnO3 prepared by electrospinning

et al. 2012

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“…The facts of the narrow excitation/emission peaks and the short lifetime indicate the direct exciton procedure dominates in this system. Similar behaviors were seen in Zn 2 GeO 4 and Ca 2 GeO 4 . Jing et al suggested the emission of Zn 2 GeO 4 should arise from the vacancies over Zn, Ge, and O sites in the host lattice.…”

Section: Resultsmentioning

confidence: 61%

“…Similar behaviors were seen in Zn 2 GeO 4 37 and Ca 2 GeO 4 . 38 Jing et al 37 suggested the emission of Zn 2 GeO 4 should arise from the vacancies over Zn, Ge, and O sites in the host lattice. Various electron configurations by each element in Zn 2 GeO 4 lead to complicated electronic states and thus a broad emission band was seen.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Constructing Concentration and Temperature Controllable Blue-Green Emission in a Single-Component Solid-State Phosphor

Wen

Gao

et al. 2021

J. Phys. Chem. C

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Controlling dopant ion concentration and temperature are two effectual methods to achieve color tuning and obtain white photoluminescent phosphors. Research of the emission manipulation by both concentration and temperature remains insufficient. In this work, we utilize the host defect emission and rare-earth ion emission in Y 2 CaGe 4 O 12 :Tb 3+ under various temperatures to obtain a series of blue-green emissions widely distributed on the Commission Internationale de L'Eclairage (CIE) map. Concentration and thermal responses of the blue and the green emissions were analyzed and the host to dopant energy transfer shows significant at low doping concentration (<0.5%) and low temperature (<300 K). The overall luminescent behavior suggests the blue and the green emissions could be treated individually. A mathematical description (R 2 = 0.982) was given to illustrate the successful controlling of emission by concentration and temperature and several cold white lights were observed at various conditions.

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“…It could be demonstrated that Eu 3+ , R + (Na, K) and Ga 3+ ions have entered into SrGeO 3 host which contributes the increase of volume value and the change of crystal field environment. Based on the effective ionic radius (r) of cations with different values of coordination number (CN) reported by Shannon, 18 the radii of Eu 3+ (0.95 Å), Na + (0.95 Å) and K + (1.33 Å) are more close to that of Sr 2+ (1.13 Å), while the radii of Ga 3+ (0.62 Å) are more close to that of Ge 4+ (0.52 Å). Therefore, for the consideration of ionic radii, Eu 3+ , R + (Na, K) and Ga 3+ ions should substitute the Sr 2+ and Ge 4+ sites in the SrGeO 3 host, respectively.…”

Section: Resultsmentioning

confidence: 99%

Luminescent Properties of SrGeO₃:Eu³⁺Red Emitting Phosphors for Field Emission Displays

Wang

Zhou

et al. 2014

ECS J. Solid State Sci. Technol.

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A novel red emitting phosphor of Eu 3+ doped SrGeO 3 was prepared through the solid state reaction. XRD, PL and CL were utilized to characterize the samples. Under the excitation of ultraviolet light and low voltage electron beams, SrGeO 3 : Eu 3+ phosphor shows the characteristic 5 D 0 -7 F 2 transition of Eu 3+ at around 617 nm. The concentration for optimum luminescence intensity of Eu 3+ was determined to be 0.04 in SrGeO 3 : xEu 3+ phosphor. The luminescent intensity could be improved by co-doping with the charge compensators of R + (Na, K) and Ga 3+ which partially substitute for Sr 2+ and Ge 4+ crystal sites, respectively. CL spectra show that Eu 3+ ions could be excited by the plasma produced by the incident electrons, furthermore, the CL properties of SrGeO 3 : Eu 3+ as a function of accelerating voltage and probe current were investigated. The results indicate that SrGeO 3 : Eu 3+ can be a suitable red-emitting phosphor candidate for FEDs.Field emission displays (FEDs) have recently gained much attention as they are considered to be the next generation flat panel displays. By employing the same operating principles, FEDs provide the potential of achieving comparable or superior levels of performance to the conventional cathode ray tubes (CRTs). [1][2][3][4][5] In the development of FEDs, efficient luminescent materials like phosphors are irreplaceable components of field emission display devices. [6][7][8][9] The successful employment of the FED technique in the practical application requires the development of phosphors which show high current density, high efficiency and good stability at low electron voltage excitation. [10][11][12][13] In addition, in order to realize full color FEDs, tricolor (red, green, blue) phosphors is necessary to be developed, especially for the stable, and highly efficient red emitting phosphors. Many efficient sulfide-based phosphors such as Y 2 O 2 S:Eu, Gd 2 O 2 S:Tb, SrGa 2 S 4 :Eu, Zn(Cd)S:Cu,Al, and ZnS:Ag,Cl, etc, have been explored as possible red low-voltage phosphors. However, sulfide phosphors are easily decomposed and emit sulfide gases under electron excitation, causing the cathodes and vacuum level in the display space to deteriorate, and lowering the luminous efficiency of phosphors. 14 Thus, in order to satisfy the application requirement of FEDs, it is an urgent assignment to develop novel red-emitting phosphors with excellent physical and chemical stabilities, and higher efficiencies. Oxide phosphors are more stable and environmentally friendly in comparison with sulfide phosphors. In the past few years, oxide based phosphors have been widely investigated as potential candidates for FED applications. 15 Oxide phosphors are more stable than the sulfides, but they are usually insulators. Due to their poor conductivity, the bombardment of high-density electron beam on the phosphor surface is easy to accumulate a lot of electrons, which reduces the energy of the electron beam and at the same time causes the chemical reaction on the phosphor surface to produce ...

show abstract

The electronic structure and photoluminescence properties of Ca2GeO4:Eu3+ in ultraviolet and vacuum ultraviolet region

Cited by 23 publications

References 24 publications

Vibrational spectra of CaGa2O4, Ca2GeO4, CaIn2O4 and CaSnO3 prepared by electrospinning

Vibrational spectra of CaGa2O4, Ca2GeO4, CaIn2O4 and CaSnO3 prepared by electrospinning

Constructing Concentration and Temperature Controllable Blue-Green Emission in a Single-Component Solid-State Phosphor

Luminescent Properties of SrGeO₃:Eu³⁺Red Emitting Phosphors for Field Emission Displays

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The electronic structure and photoluminescence properties of Ca2GeO4:Eu3+ in ultraviolet and vacuum ultraviolet region

Cited by 23 publications

References 24 publications

Vibrational spectra of CaGa2O4, Ca2GeO4, CaIn2O4 and CaSnO3 prepared by electrospinning

Vibrational spectra of CaGa2O4, Ca2GeO4, CaIn2O4 and CaSnO3 prepared by electrospinning

Constructing Concentration and Temperature Controllable Blue-Green Emission in a Single-Component Solid-State Phosphor

Luminescent Properties of SrGeO3:Eu3+Red Emitting Phosphors for Field Emission Displays

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Luminescent Properties of SrGeO₃:Eu³⁺Red Emitting Phosphors for Field Emission Displays