Host composition dependent tuneable morphology and luminescent property of the CaXSrYBa1−X−YWO4:RE3+ (RE=Pr, Ho, and Er) phosphors

Li, Linlin; Wu, Hongpeng

doi:10.1016/j.jallcom.2017.01.255

Cited by 10 publications

(7 citation statements)

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“…The broad band located at ∼258 nm can be assigned to host absorption, , which was observed at ∼264 nm for NaLu(WO 4 ) 2 in this work (Figure S6). The peaks in the 300–500 nm region and located at ∼362, 386, 420, 453, and 487 nm correspond to excitation from the 5 I 8 ground state to the 5 G 2 , 5 G 4 , 5 G 5 , 5 F 1 / 5 G 6 , and 5 F 2 energy levels within the 4f 10 shell of Ho 3+ , as labeled in the figure, ,, with the 5 I 8 → 5 F 1 / 5 G 6 transition at ∼453 nm being the strongest. The Ho 3+ phosphor exhibits strong green emission at ∼545 nm ( 5 F 4 / 5 S 2 → 5 I 8 transition) and weak red emission at ∼650 nm ( 5 F 5 → 5 I 8 transition) under 453 nm excitation.…”

Section: Resultsmentioning

confidence: 93%

Crystal Structure of NaLuW₂O₈·2H₂O and Down/Upconversion Luminescence of the Derived NaLu(WO₄)₂:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

et al. 2018

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Hydrothermally reacting Lu(NO) and NaWO·2HO at 200 °C and pH = 8 produced the new compound NaLuWO·2HO, which was analyzed via the Rietveld technique to crystallize in the orthorhombic system (space group: Cmmm) with cell parameters a = 21.655(1), b = 5.1352(3), and c = 3.6320(2) Å and cell volume V = 403.87(4) Å. The crystal structure presents -(NaO)-(NaO)- and -(LuO(HO)WO)-(LuO(HO)WO)- alternating layers linked together by the O ion common to NaO octahedron and WO triangle bipyramid. Tetragonal structured and phase-pure Na(LuLnYb)(WO) phosphors (Ln = Ho, Er, and Tm) were directly produced by calcining their NaLuWO·2HO analogous precursors at 600 °C for 2 h, followed by a detailed study of their downconversion/upconversion (DC/UC) photoluminescence. It was shown that the UC luminescence is dominated by a red band at ∼650 nm for Ho (F → I transition), green bands at ∼500-575 nm for Er (H/S → I transitions) and a blue band at ∼476 nm for Tm (G → H transition), all via a three-photon process. DC luminescence of the phosphors is characterized by a ∼545 nm green emission for Ho (F/S → I transition, λ = 453 nm), ∼500-575 nm green emissions for Er (H/S → I transitions, λ = 380 nm), and a ∼455 nm blue emission for Tm (D → F transition, λ = 360 nm), with CIE chromaticity coordinates of around (0.27, 0.71), (0.26, 0.72), and (0.15, 0.04), respectively.

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Section: Resultsmentioning

confidence: 93%

Crystal Structure of NaLuW₂O₈·2H₂O and Down/Upconversion Luminescence of the Derived NaLu(WO₄)₂:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

et al. 2018

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“…The luminescent properties of phosphors are affected by the doped rare earth ions, as well as the structure and composition of the substance host [11,12]. Tungstate materials are considered to be effective self-activated fluorescent materials with high-absorption cross-sections [13,14], broadband emissions [15], and high quantum efficiency [16,17].…”

Section: Introduction mentioning

confidence: 99%

Effect of anionic group [SiO4]4−/[PO4]3− on the luminescence properties of Dy3+-doped tungstate structural compounds

et al. 2021

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Novel scheelite structures of Li2Ca(WO4)2, Li2Ca2(WO4)(SiO4), and LiCa2(WO4)(PO4) fluorescent materials were successfully prepared using a high-temperature solid-phase process. The compounds were characterized by X-ray diffraction and energy dispersive spectroscopy. The tests revealed that the substitution of [WO4]2− by [SiO4]4− or [PO4]3− tetrahedron in tungstate had no significant influence on the crystal structure of the Li2Ca(WO4)2. When Dy3+ ions were introduced as an activator at an optimum doping concentration of 0.08 mol%, all of the as-prepared phosphors generated yellow light emissions, and the emission peak was located close to 576 nm. Replacing [WO4]2− with [SiO4]4− or [PO4]3− tetrahedron significantly increased the luminescence of the Li2Ca(WO4)2 phosphors. Among them, the LiCa2(WO4)(PO4):0.08Dy3+ phosphor had the best luminescence properties, decay life (τ = 0.049 ms), and thermal stability (87.8%). In addition, the as-prepared yellow Li2Ca(WO4)2:0.08Dy3+, Li2Ca2(WO4)(SiO4):0.08Dy3+, and LiCa2(WO4)(PO4):0.08Dy3+ phosphor can be used to fabricate white light emitting diode (LED) devices.

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“…42,45 Moreover, the emission at 656 nm is attributed to the hypersensitive 3 P 0 → 3 F 2 transition of Pr 3+ (ΔS = 0, ΔJ = 2; S = spin angular momentum, J = total angular momentum), which is a forced electric dipole transition, and strongly dependent on the field environment around Pr 3+ ions. 40 Furthermore, Figure 6A epitomizes the improvement in red emission intensity of CBV: Pr 3+ phosphor with increasing concentration of Pr 3+ ions up to 1.25 mol%. Figure 6B clearly shows that the emission intensity at 608 and 656 nm wavelengths under 473 nm excitation reaches a maximum at 1.25 mol% (optimized concentration) of Pr 3+ ions and decreases contrarily with increasing Pr 3+ concentration owing to concentration quenching phenomenon.…”

Section: Photoluminescence Propertiesmentioning

confidence: 90%

“…The emission spectra reveals various sharp bands located at 533, 547, 583, 608, 620, 656, 680, and 693 nm attributed to 3 P 1 → 3 H 5 , 3 P 0 → 3 H 5 , 3 P 1 → 3 H 6 , 1 D 2 → 3 H 4 , 3 P 0 → 3 H 6 , 3 P 0 → 3 F 2 , 3 P 0 → 3 F 3 , and 1 D 2 → 3 H 5 transitions of Pr 3+ ions, respectively. [37][38][39][40][41][42][43] The emission peak located at 608 nm ( 1 D 2 → 3 H 4 ) dominates among all the peaks present in the emission spectra. In the present case, there is a possibility of inhomogeneous crystal field and low symmetry around Pr 3+ ions, which may be ascribed to minute Ca/Bi disordered ratio in the CBV lattice structure.…”

Section: Photoluminescence Propertiesmentioning

confidence: 99%

Development of deep red–emitting CaBiVO₅:Pr³⁺ phosphor for multifunctional optoelectronic applications

Kaur

Jayasimhadri

2021

J. Am. Ceram. Soc.

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Orthorhombic Pr 3+ -doped calcium bismuth vanadate (CBV: Pr 3+ ) phosphors have been synthesized successfully via a citrate-gel method. The single-phase formation of CBV: Pr 3+ phosphor has been endorsed by X-ray diffraction (XRD) analysis. The scanning electron microscopy (SEM) image reveals dense-particle packaging with the quasi-spherical shape for the prepared CBV: Pr 3+ phosphors. Under blue light excitation, CBV: Pr 3+ phosphors exhibit intense red emission bands located at 608 and 656 nm wavelengths, overlapping with the absorption spectrum of P R phytochrome, which is present in plants. To achieve the maximum red intensity, the Pr 3+ ion concentration is optimized to be 1.25 mol% in the CBV host, after which the emission intensity ceases due to concentration quenching. Dexter's theory disclosed the possibility of d-d multipolar interaction among Pr 3+ ions at higher concentrations of Pr 3+ ions in the CBV host. The CIE coordinates are found to be positioned in the pure red region for CBV: Pr 3+ phosphor and in the proximity of red-emitting commercial phosphor. The temperature-dependent spectral studies manifest substantial thermal stability of the as-synthesized phosphor. All the studies mentioned above specify the tremendous potentiality of thermally stable CBV: Pr 3+ phosphor in agricultural lighting and w-LED applications. K E Y W O R D Sagricultural lighting, citrate gel, energy transfer, phytochrome, vanadate | 5765 KAUR And JAYASIMHAdRI the capability of controlling spectral composition via phosphor coated over the LED chip. [7][8][9] The emission from pc-LED matching well with plant photoreceptors (P R and P FR ) can offer ideal production in plant growth systems. Besides this, pc-LED delivers numerous advantages over prevailing lighting sources (incandescent, metal halide, and high-pressure lamps) such as environmental protection, improved energy efficiency, smaller size, advanced control capabilities, longer service time, and reduced radiated heat. [10][11][12] In general, pc-LEDs fabricated by coupling with FR-emitting Mn 4+ -doped phosphors and other red phosphors may exhibit an emission overlapped with the absorption spectrum of phytochromes. Such fabricated pc-LEDs can aid to control the duration of sunlight sensed by plants, which can regulate the flowering time of plants. 2,5,[13][14][15] Therefore, it is of great significance to develop eco-friendly phosphors-emitting red light under n-UV/blue light excitation for promoting regulated plant growth.Recently, numerous red phosphors incorporating rareearth (RE) ions (Eu 3+ and Sm 3+ ) have been investigated, which possess excellent chemical, thermal, and physical stabilities along with intense emission corresponding to the intra-4f transitions. 12,[16][17][18] But, there are only a few reports on Pr 3+ -doped red-emitting materials and their application for artificial lighting in plant growth systems. Such red luminescent material can additionally be applied in various fields, such as solar cells, white (w)-LEDs, fingerprint sensing, biologica...

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Host composition dependent tuneable morphology and luminescent property of the CaXSrYBa1−X−YWO4:RE3+ (RE=Pr, Ho, and Er) phosphors

Cited by 10 publications

References 47 publications

Crystal Structure of NaLuW₂O₈·2H₂O and Down/Upconversion Luminescence of the Derived NaLu(WO₄)₂:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

Crystal Structure of NaLuW₂O₈·2H₂O and Down/Upconversion Luminescence of the Derived NaLu(WO₄)₂:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

Effect of anionic group [SiO4]4−/[PO4]3− on the luminescence properties of Dy3+-doped tungstate structural compounds

Development of deep red–emitting CaBiVO₅:Pr³⁺ phosphor for multifunctional optoelectronic applications

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Host composition dependent tuneable morphology and luminescent property of the CaXSrYBa1−X−YWO4:RE3+ (RE=Pr, Ho, and Er) phosphors

Cited by 10 publications

References 47 publications

Crystal Structure of NaLuW2O8·2H2O and Down/Upconversion Luminescence of the Derived NaLu(WO4)2:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

Crystal Structure of NaLuW2O8·2H2O and Down/Upconversion Luminescence of the Derived NaLu(WO4)2:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

Effect of anionic group [SiO4]4−/[PO4]3− on the luminescence properties of Dy3+-doped tungstate structural compounds

Development of deep red–emitting CaBiVO5:Pr3+ phosphor for multifunctional optoelectronic applications

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Crystal Structure of NaLuW₂O₈·2H₂O and Down/Upconversion Luminescence of the Derived NaLu(WO₄)₂:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

Crystal Structure of NaLuW₂O₈·2H₂O and Down/Upconversion Luminescence of the Derived NaLu(WO₄)₂:Yb/Ln Phosphors (Ln = Ho, Er, Tm)

Development of deep red–emitting CaBiVO₅:Pr³⁺ phosphor for multifunctional optoelectronic applications