Synthesis and photoluminescence properties of Eu3+ doped Sr5Nb4O15 red-emitting phosphors for white LEDs

Tang, Qiyun; Yang, Tao; Guo, Bin; Bi-you, Peng; Huang, Haifeng; Ao, Jinqing

doi:10.1016/j.ijleo.2020.165770

Cited by 10 publications

(3 citation statements)

References 19 publications

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“…The cheaper pc based WLED's have become very important as the next generation solid state lighting source. In fact, the WLED's have almost completely replaced the conventional incandescent and fluorescent lamp sources due to its excellent features like low energy consumption, high brightness, long lifetime, environment friendly, almost no carbon emission and Mercury free [1][2][3][4][5][6][7]. Basically the pc based WLED's based phosphors are inorganic compounds consisting of host and activator or host, activator and sensitizer.…”

Section: Introductionmentioning

confidence: 99%

Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu³⁺ over single phase ZnO:xEu³⁺ phosphors: a comparative study

Singh¹,

Mishra²,

Bahadur³

2023

Phys. Scr.

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Mixed phase ZnO-CAZO:xEu3+ phosphors have been synthesized by solid state reaction method to get tunable light including white light under excitation with different wavelengths. The XRD, SEM, FTIR, UV–vis absorption, photoluminescence excitation and emission spectra of the samples and the lifetime of 5D0 level of Eu3+ ions have been studied. The ZnO phosphor has well known hexagonal structure, whereas Ca3Al4ZnO10 (CAZO) has orthorhombic structure. The UV–vis spectral studies show that the materials have wide band gap. The excitation spectra of ZnO-CAZO:xEu3+ phosphors with λ em = 613 nm show broad bands at 270 and 370 nm alongwith discrete peaks due to Eu3+ ion. An excitation with 370 nm of ZnO-CAZO:xEu3+ phosphors results a broad continuum from 400–700 nm with maxima at 520 nm. The excitation with 270/394 nm on the other hand gives intense discrete peaks due to Eu3+ ion alongwith broad host emission. However, on excitation with 467 nm, it gives intense red emission with CIE coordinates (0.64, 0.36) and color purity 90%. The emission intensity is maximum for ZnO-CAZO:1.5Eu3+ phosphor. The excitation with 394 nm, results white light for ZnO-CAZO:0.5Eu3+ phosphor with CIE coordinates (0.34, 0.35), which is almost equal to the ideal white light coordinates (0.33, 0.33). The emission intensity in the mixed condition (ZnO-CAZO:1.5Eu3+) is 4.94 times greater than its single (ZnO:1.5Eu3+) phase under 370 nm excitation.

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Section: Introductionmentioning

confidence: 99%

Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu³⁺ over single phase ZnO:xEu³⁺ phosphors: a comparative study

Singh¹,

Mishra²,

Bahadur³

2023

Phys. Scr.

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“…When the pseudo-binary oxide Zn3Nb2O8 nanomaterials were doped with Eu 3+ ions, a shift to the smaller 2Ɵ values for the entire XRD spectrum was observed. The shifting of the peak is mainly due to the difference in ionic radii between the initial element and the Eu 3+ dopant ion, which introduces different parameters in the lattice [52,53]. When the pseudo-binary oxide Zn3Nb2O8 nanomaterials were doped with Eu 3+ a shift to the smaller 2 Ɵ values for the entire XRD spectrum was observed.…”

Section: Introductionmentioning

confidence: 99%

“…Using the same computer code [58], the ionic configuration of the O 2− , Nb 5+ , values for the entire XRD spectrum was observed. The shifting of the peak is mainly due to the difference in ionic radii between the initial element and the Eu 3+ dopant ion, which introduces different parameters in the lattice [52,53].…”

Section: Introductionmentioning

confidence: 99%

Nanomaterials Based on Collaboration with Multiple Partners: Zn3Nb2O8 Doped with Eu3+ and/or Amino Substituted Porphyrin Incorporated in Silica Matrices for the Discoloration of Methyl Red

Bîrdeanu

Fratilescu

Epuran

et al. 2023

IJMS

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Designing appropriate materials destined for the removal of dyes from waste waters represents a great challenge for achieving a sustainable society. Three partnerships were set up to obtain novel adsorbents with tailored optoelectronic properties using silica matrices, Zn3Nb2O8 oxide doped with Eu3+, and a symmetrical amino-substituted porphyrin. The pseudo-binary oxide with the formula Zn3Nb2O8 was obtained by the solid-state method. The doping of Zn3Nb2O8 with Eu3+ ions was intended in order to amplify the optical properties of the mixed oxide that are highly influenced by the coordination environment of Eu3+ ions, as confirmed by density functional theory (DFT) calculations. The first proposed silica material, based solely on tetraethyl orthosilicate (TEOS) with high specific surface areas of 518–726 m2/g, offered better performance as an adsorbent than the second one, which also contained 3-aminopropyltrimethoxysilane (APTMOS). The contribution of amino-substituted porphyrin incorporated into silica matrices resides both in providing anchoring groups for the methyl red dye and in increasing the optical properties of the whole nanomaterial. Two different types of methyl red adsorption mechanisms can be reported: one based on surface absorbance and one based on the dye entering the pores of the adsorbents due to their open groove shape network.

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Unwavering red emission from Eu3+ activated Li6AlGd(BO3)4 phosphors

Jamalaiah,

Annar,

Madhu

et al. 2023

J Mater Sci: Mater Electron

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Synthesis and photoluminescence properties of Eu3+ doped Sr5Nb4O15 red-emitting phosphors for white LEDs

Cited by 10 publications

References 19 publications

Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu³⁺ over single phase ZnO:xEu³⁺ phosphors: a comparative study

Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu³⁺ over single phase ZnO:xEu³⁺ phosphors: a comparative study

Nanomaterials Based on Collaboration with Multiple Partners: Zn3Nb2O8 Doped with Eu3+ and/or Amino Substituted Porphyrin Incorporated in Silica Matrices for the Discoloration of Methyl Red

Unwavering red emission from Eu3+ activated Li6AlGd(BO3)4 phosphors

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Synthesis and photoluminescence properties of Eu3+ doped Sr5Nb4O15 red-emitting phosphors for white LEDs

Cited by 10 publications

References 19 publications

Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu3+ over single phase ZnO:xEu3+ phosphors: a comparative study

Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu3+ over single phase ZnO:xEu3+ phosphors: a comparative study

Nanomaterials Based on Collaboration with Multiple Partners: Zn3Nb2O8 Doped with Eu3+ and/or Amino Substituted Porphyrin Incorporated in Silica Matrices for the Discoloration of Methyl Red

Unwavering red emission from Eu3+ activated Li6AlGd(BO3)4 phosphors

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Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu³⁺ over single phase ZnO:xEu³⁺ phosphors: a comparative study

Excitation wavelength dependent color tunability, white light generation and enhanced optical emission in mixed phase ZnO–CAZO:xEu³⁺ over single phase ZnO:xEu³⁺ phosphors: a comparative study