Variable Emission Changes in Bi3+/Ln3+ (Ln = Eu, Sm, Dy) Co-doped Lutetium Vanadates (LuVO4)

Zheng, Yufeng; Hu, Jing; Deng, Surong; Gao, Jinwei; Wang, Qianming

doi:10.1007/s11664-016-4376-x

Cited by 7 publications

(3 citation statements)

References 21 publications

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“…and the price of rare earth ions has been maintained at a higher level. 15,16 In this case, the development and investigation for new types of red-emitting phosphors free from rare earth ions with excellent fluorescent properties will be a real challenge. As a typical non-rare-earth activator ion, the Mn 4+ ion has generated extensive interest in red luminescent materials since the Mn 4+ -activated phosphors can be achieved under mild conditions and demonstrate broad absorption bands in the nUV or blue light region accompanied by red emission due to the spin-forbidden 2 E g − 4 A 2g transition.…”

Section: ■ Introductionmentioning

confidence: 99%

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A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

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The substitution of metal sites in Mg 2 TiO 4 substrate leads to charge imbalance that will be closely related to a variety of changes including lattice structure, cell distortion, and photophysical properties. Herein, the co-substitution strategy of [Ga 3+ −Ga 3+ ] for [Mg 2+ −Ti 4+ ] and Sn 4+ for Ti 4+ achieves for the first time the novel Mg 3 Ga 2 SnO 8 (MGS):xMn 4+ (x = 0−3%) phosphors with efficient red emissions. In terms of X-ray powder diffraction (XRD) and Rietveld refinement analysis, MGS:Mn 4+ possesses a structure isotypic of Mg 2 TiO 4 in the cubic space group Fd3̅ m (227). There are two types of octahedra for Mn 4+ ions in this structure, where Ga 3+ ions completely occupy a group of octahedral sites and Mg 2+ /Sn 4+ has been randomly distributed over another group of octahedral sites. A strong excitation band in the broad spectral range (220− 550 nm) has been identified, thus facilitating the commercial uses for blue LED chips excitation. An intense red emission band at 680 nm has been observed due to the characteristic 2 E g − 4 A 2g transition of Mn 4+ ions. A concentration quenching effect occurs when the Mn 4+ content exceeds 1.5%, and the quenching mechanism is demonstrated to be dipole−quadrupole interactions. Temperature-dependent luminescence measurements support its good thermal stability, and the corresponding activation energy E a is determined to be 0.2552 eV. The possible luminous mechanism of the Mn 4+ ion is explained by the Tanabe−Sugano energy level diagram. The crystal field strength and the Racah parameters together with the nephelauxetic ratio are also determined for Mn 4+ in the MGS lattice. High color rendition warm white-lightemitting diodes (WLEDs) based on the optimal phosphor MGS:1.5%Mn 4+ ,1.5%Li + possess a color rendering index and color temperature of 85.6 and 3658 K, respectively. Its feasibility for application in solid-state white lighting has been verified.

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Section: ■ Introductionmentioning

confidence: 99%

“…In addition, we need several steps to prepare Eu 2+ -doped (oxy) nitrides. and the price of rare earth ions has been maintained at a higher level. , In this case, the development and investigation for new types of red-emitting phosphors free from rare earth ions with excellent fluorescent properties will be a real challenge.…”

Section: Introductionmentioning

confidence: 99%

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

et al. 2019

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“…It is commonly the 1 s 0 → 3 p 1 transition due to the excited state 1 p 1 which has higher energy state and bad stability compared with the 3 p 1 state. On the basis of the strong sensitivity to the coordination environment, the emission of Bi 3+ can be tunable from the ultraviolet (UV) to the yellow region due to the different covalence, bond length, distortion, and so on. − ,, Moreover, Bi 3+ is not only a good activator, but also a good sensitizer through strengthening and broadening UV excitation bands. ,− Thus, codoping Bi 3+ with rare-earth ions, such as Eu 3+ , , has been adopted to achieve color-tunable phosphors by energy transfer.…”

Section: Introductionmentioning

confidence: 99%

Color-Tunable Luminescence Properties of Bi³⁺ in Ca₅(BO₃)₃F via Changing Site Occupation and Energy Transfer

Wang

et al. 2017

Chem. Mater.

177

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Generally, 6s electron and 6p electron of Bi3+ ions are located in its outermost layer; thus, luminescence properties of Bi3+ are strongly associated with the coordination environment around Bi3+. Bi3+ ions occupy different cationic positions in hosts, which may cause the movement of the emission spectrum. In order to investigate the luminescent property of Bi3+, a series of Bi3+ doped Ca5(BO3)3F species are synthesized. There are three types of Ca2+ sites in the host, which could be substituted by Bi3+. Upon the 322 nm excitation of Bi3+, a broad emission band can be observed, which is ascribed to the 1s0 → 3p1 transition of Bi3+. Meanwhile, there is the emission shift of Ca5(BO3)3F:xBi3+, and its emission color can be altered from blue to cyan. It may result from Bi3+ occupying different positions of Ca2+ in the host, which can give rise to different degrees of a nephelauxetic effect and crystal field splitting. In order to explore the relationship between the luminescence properties of Bi3+ and the nepelauxetic effect, the value of the centroid shift (∈c) is calculated. Centroid shift (∈c) is related to the covalence and average bond length of an octahedron in which the influence of covalence is primary. The relationship between the luminescence properties of Bi3+ and the crystal field splitting is discussed. The crystal field splitting is related to the interaction between the Bi3+ species, the crystal field splitting energy (Δ), and the distortion of the crystal. Emission spectra are asymmetric; meanwhile, the emission spectra have remarkable changes at various excitation wavelengths. This proves that the broadband emission band consists of at least two emission centers. In order to assess this hypothesis, the decay curves are measured. This confirms that there are three luminescence centers in a host. On one hand, considering the effect of the centroid shift (∈c) and crystal field splitting (∈cfs), the sources of three luminescence centers are confirmed by calculating the total shift (D(A)) of the 6s6p level of Bi3+ in a host. On the other hand, the source of three luminescence centers is determined by the changing trend of the average bond length of the octahedron. In addition, the luminescence properties of Ca5(BO3)3F:Bi3+, Eu3+, are investigated as well. There is efficient energy transfer from the Bi3+ to the Eu3+ ion, and the color-tunable phosphor can be achieved by the combination of the appropriate proportion of Bi3+ and Eu3+ ions. The emission color can gradually change from cyan to red.

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Synthesis and luminescence investigation of Ba2V2O7-co-doped Dy3+/Eu3+ phosphors for white light-emitting diode applications

Bharathi¹,

Kavitha²,

Ramaswamy³

et al. 2023

Indian J Phys

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Variable Emission Changes in Bi3+/Ln3+ (Ln = Eu, Sm, Dy) Co-doped Lutetium Vanadates (LuVO4)

Cited by 7 publications

References 21 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

Color-Tunable Luminescence Properties of Bi³⁺ in Ca₅(BO₃)₃F via Changing Site Occupation and Energy Transfer

Synthesis and luminescence investigation of Ba2V2O7-co-doped Dy3+/Eu3+ phosphors for white light-emitting diode applications

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Variable Emission Changes in Bi3+/Ln3+ (Ln = Eu, Sm, Dy) Co-doped Lutetium Vanadates (LuVO4)

Cited by 7 publications

References 21 publications

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

A New Co-Substitution Strategy as a Model to Study a Rare-Earth-Free Spinel-Type Phosphor with Red Emissions and Its Application in Light-Emitting Diodes

Color-Tunable Luminescence Properties of Bi3+ in Ca5(BO3)3F via Changing Site Occupation and Energy Transfer

Synthesis and luminescence investigation of Ba2V2O7-co-doped Dy3+/Eu3+ phosphors for white light-emitting diode applications

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Color-Tunable Luminescence Properties of Bi³⁺ in Ca₅(BO₃)₃F via Changing Site Occupation and Energy Transfer