Crystal Structure and Luminescence Properties of Rare Earth Doped Ba 2 Bi 2/3 TeO 6 Double Perovskites

Lal, Sariga C.; Rajan, Athira; Subodh, G.

doi:10.1016/j.matpr.2017.04.011

Cited by 14 publications

(11 citation statements)

References 7 publications

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“…The emergence of medium peaks at 495 cm −1 can be detected and be assigned to antisymmetric stretching vibrations ( v 1 ) of Te–O bonds in the octahedral structures. At the same time, strong peaks at 662, 680, and 710 cm −1 were clear and can be related to the symmetric stretching vibration ( v 2 ) of the Te–O bonds 19 , 35 – 38 . It is apparent that as dopant concentration increased, there were more quenches of peaks.…”

Section: Resultsmentioning

confidence: 84%

Understanding the structural, optical, and dielectric characteristics of SrLaLiTe1−xMnxO6 perovskites

Halizan

Mohamed

Yahya

2021

Sci Rep

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In electronic applications, good dielectric permittivity material has huge potential in the capacitive energy storage devices. Herein, in the present work the dielectric study of SrLaLiTe1−xMnxO6 (x = 0.02, 0.04, 0.06, 0.08, and 0.10) double perovskites has been studied and discussed. These compounds were prepared through solid-state reaction method. All of the prepared compounds were confirmed to crystallized in monoclinic structure of P21/n space symmetry with better crystallization when dopant concentrations increased until x = 0.08. The formation of Li–O–Te/Mn bonds in octahedral structures in all compounds were confirmed in this study. The existence of peaks at specific wavenumbers indicated vibrations of B–site cations’ bonds. When dopant amounts were increased from x = 0.02 to x = 0.08, there was an increasing trend of grains sizes formation in the compounds. The discussions on effects of grain sizes towards dielectric properties were included in this paper. Other important results and discussions comprised of the significant effects of dopant on the optical band gap (Eopt) and absorption frequencies of the compounds. The decreasing trend of Eopt towards semiconductor range indicated the compounds’ promising potentials for optoelectronic device application.

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Section: Resultsmentioning

confidence: 84%

Understanding the structural, optical, and dielectric characteristics of SrLaLiTe1−xMnxO6 perovskites

Halizan

Mohamed

Yahya

2021

Sci Rep

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“…The XRD indicates no structural change however some unknown impurity phase was detected for doped Sm 3+ with 0.1 concentrations and indicated by (*). The peaks of the XRD pattern of Ba 0.5 Rb 0.5 LaTeO 6 and Ba 0.5 Rb 0.5 La 0.9 Sm 0.1 TeO 6 were indexed in the cubic Fm m space group system using software GSAS and EXPGUI as reported in the JCPDS File No.01-070-4384 [18]. Refinement of all parameters are performed until convergence with the value of chi-square close to 1, which confirms the goodness of refinement.…”

Section: Amentioning

confidence: 99%

Structural and Optical Properties of Sm3+ Doped B-site Ba0.5Rb0.5LaTeO6 Double Perovskites

Mohamed*,

Abdullah,

Halizan

et al. 2019

IJRTE

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A double perovskites Ba0.5Rb0.5LaTeO6 and Ba0.5Rb0.5La0.9Sm0.1TeO6 were synthesized by a solid-state reaction method. The structural properties were studied by using the X-Ray powder diffraction (XRD) and fourier transform infrared spectroscopy (FTIR). Structural analysis of XRD based on Rietveld refinement indicates that the Ba0.5Rb0.5LaTeO6 and Ba0.5Rb0.5La0.9Sm0.1TeO6 have cubic symmetry with space group Fm m. The tolerance factor of the sample also decreases with Sm3+ substitution. The value obtained from tolerance factor for Ba0.5Rb0.5LaTeO6 and Ba0.5Rb0.5La0.9Sm0.1TeO6 was 0.994 and 0.982 respectively. The optical properties were studied using the UV visible absorption spectroscopy (UV-vis). The Ba0.5Rb0.5LaTeO6 and Ba0.5Rb0.5La0.9Sm0.1TeO6 was assumed to be indirect band gap and the optical band gap obtained for Ba0.5Rb0.5LaTeO6 and Ba0.5Rb0.5La0.9Sm0.1TeO6 were 4.1 eV and 4.3 eV respectively

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“…Perovskite‐type oxides are well known for their potential applications in various fields such as solid oxide fuel cells, electronic devices, and sensors . Recently various rare earths doped perovskites and double perovskites had been reported to attain excellent luminescence properties including cathodoluminescence, up‐conversion and achieving RGB colors which are an important part for white light emissions .…”

Section: Introductionmentioning

confidence: 99%

Tailoring the photoluminescent properties of samarium and dysprosium codoped calcium zirconate perovskites for WLED applications

Venugopal¹,

Kumar²,

Satheesh³

et al. 2019

Int J Applied Ceramic Tech

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This study investigates the photoluminescent properties of Dy3+/Sm3+ single and codoped CaZrO3perovskites that were prepared through conventional solid state ceramic route method. X‐ray diffraction studies confirmed the orthorhombic (Pnma) perovskite structure of the calcined samples. Photoluminescence studies of Dy3+doped CaZrO3 systems showed emission peaks at 484 nm and 575 nm due to the transition between 4F9/2–6H15/2 and 4F9/2–6H13/2 levels respectively. Intense red emissions were observed for Sm3+ doped CaZrO3 systems at around 567 nm, 603 and 646 nm that corresponds to the 4G5/2 → 6H5/2, 4G5/2 → 6H7/2 and 4G5/2 → 6H9/2 transitions of Sm3+. Two different emissions were observed at different excitations for Dy3+/Sm3+ codoped CaZrO3systems. Pleasant white light emission was achieved for the CaZr0.9Sm0.025Dy0.075O3 system at 354 nm excitation with CIE color coordinates (0.3310, 0.3349) with a quantum yield of 16.14%, makes this system a promising candidate for WLED and display device applications. Uniform grain morphology and elemental composition of CaZr0.9Sm0.025Dy0.075O3 sample was revealed from scanning electron microscopic and electron dispersive X‐ray analysis. The presence of elements and their oxidation states in the calcined samples for doubly doped system was confirmed from X‐Ray photoelectron spectroscopicstudies.

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Crystal Structure and Luminescence Properties of Rare Earth Doped Ba 2 Bi 2/3 TeO 6 Double Perovskites

Cited by 14 publications

References 7 publications

Understanding the structural, optical, and dielectric characteristics of SrLaLiTe1−xMnxO6 perovskites

Understanding the structural, optical, and dielectric characteristics of SrLaLiTe1−xMnxO6 perovskites

Structural and Optical Properties of Sm3+ Doped B-site Ba0.5Rb0.5LaTeO6 Double Perovskites

Tailoring the photoluminescent properties of samarium and dysprosium codoped calcium zirconate perovskites for WLED applications

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