Crystal structure and luminescence properties of self-activated phosphor CsDyP 2 O 7

Zhao, Dan; Ma, Fa‐Xue; Zhang, Ruijuan; Zhang, Lei; Fan, Yun-Chang

doi:10.1016/j.materresbull.2016.12.006

Cited by 16 publications

(5 citation statements)

References 33 publications

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“…The band gap energy is estimated from the extrapolation of the straight line portion until the energy axis to be 3.7eV and 3 eV respectively. CsYP 2 O 7 compound has optical properties, comparable to those found for other pyrophosphates, thus these materials can be classified as semiconductors [53,54] ( Table 3).…”

Section: Optical Propertiesmentioning

confidence: 82%

Ionic conductivity and optical properties of self-activated phosphor CsYP2O7

Karray

OUESLETI

Khirouni

et al. 2020

Preprint

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Pyrophosphates are interesting compounds as optical materials, ionic conductors, solid electrolytes, battery electrodes, solid-state lasers and active layer for sensors. In this context, the compound CsYP 2 O 7 has been synthesized by the solid-state reaction method. The X-ray powder diffraction at room temperature confirmed the phase formation of the synthesized compound in the monoclinic phase. The composition and morphology were performed by energy dispersive spectroscopy coupled with scanning electron microscope . The optical properties of the compound were studied by UV–Vis absorption spectroscopy. By direct investigation of the UV absorption measurements and using the Tauc model, we have found that the direct optical band gap is equal to 3.7eV. Two of the relaxation mechanisms were clearly identified from Nyquist plots and modulus analysis, which can be discerned to both grain and grain boundary contributions effect. The obtained results were analyzed by fitting the experimental data to an equivalent circuit model.Bulk resistance and grain boundary resistance decreased with the increase of temperature, which confirmed negative temperature coefficient of resistance behavior. The same values of activation energies obtained from the impedance (0.43 eV ) and hopping frequency (0.42 eV),prove that the transport happens through an ion hopping mechanism dominated by the motion of the Cs + cations in the structure of the CsYP 2 O 7 material. The results confirm tha the synthesized compound is suitable for catalysis and optoelectronic applications.

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Section: Optical Propertiesmentioning

confidence: 82%

Ionic conductivity and optical properties of self-activated phosphor CsYP2O7

Karray

OUESLETI

Khirouni

et al. 2020

Preprint

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“…To try to grow CsEuP 2 O 7 crystals, we replaced the lanthanide precursor with europium compounds for several solution , and solid-state , synthesis procedures for isostructural lanthanide compounds. None of the procedures returned a phase containing Cs, Eu, P, and O.…”

Section: Resultsmentioning

confidence: 99%

Design Rules, Accurate Enthalpy Prediction, and Synthesis of Stoichiometric Eu³⁺ Quantum Memory Candidates

Riedel,

Shoemaker

2024

J. Am. Chem. Soc.

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Stoichiometric Eu 3+ compounds have recently shown promise for building dense, optically addressable quantum memory as the cations' long nuclear spin coherence times and shielded 4f electron optical transitions provide reliable memory platforms. Implementing such a system, though, requires ultranarrow, inhomogeneous linewidth compounds. Finding this rare linewidth behavior within a wide range of potential chemical spaces remains difficult, and while exploratory synthesis is often guided by density functional theory (DFT) calculations, lanthanides' 4f electrons pose unique challenges for stability predictions. Here, we report DFT procedures that reliably reproduce known phase diagrams and correctly predict two experimentally realized quantum memory candidates. We are the first to synthesize the double perovskite halide Cs 2 NaEuF 6 . It is an air-stable compound with a calculated band gap of 5.0 eV that surrounds Eu 3+ with mononuclidic elements, which are desirable for avoiding inhomogeneous linewidth broadening. We also analyze computational database entries to identify phosphates and iodates as the next generation of chemical spaces for stoichiometric quantum memory system studies. This work identifies new candidate platforms for exploring chemical effects on quantum memory candidates' inhomogeneous linewidth while also providing a framework for screening Eu 3+ compound stability with DFT.

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“…The SrHAp nanorods showed an intense bright blue emission (centered at 432 nm), which can be attributed to the CO 2 ˙ − radical impurities in the crystal lattice under long-wavelength UV-light irradiation. Zhao 9 reported the preparation of a new phosphor, CsDyP 2 O 7 , via a high-temperature flux method. The view of the crystal structure of CsDyP 2 O 7 containing DyO 6 polyhedra, PO 4 tetrahedra, and Cs + ions is shown in Fig.…”

Section: Types and Configurational Relationshipmentioning

confidence: 99%