Luminescence and EPR studies of ultraviolet light emitting La2Zr2O7:Gd3+ phosphor powder

Singh, Vijay; Sivaramaiah, G.; Rao, J.L.; Kumaran, Rangarajulu Senthil; Singh, Pramod K.; Kim, Taesu; Kim, Lark Kyo

doi:10.1007/s10854-015-3051-y

Cited by 19 publications

(5 citation statements)

References 51 publications

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“…Figure 3 shows the UV emission of Gd 3+ in the various glasses, as assessed under excitation at 275 nm ( 8 S 7/2 → 6 I J transitions) 2. 3 A relatively weak and broad emission band is observed towards the visible region for the GdCu0.2–0.6 glasses. This is likely due to luminescence from traces of monovalent copper (e.g.…”

Section: Resultsmentioning

confidence: 99%

“…Dielectric materials activated with Gd 3+ ions are attractive as sources for ultraviolet (UV) emission in phototherapy lamps, which are useful for the treatment of skin diseases 1–3. Hence, approaches to maximize the efficiency of UV‐type B light (280–320 nm) emission, which is suitable for such applications, are currently under investigation.…”

Section: Introductionmentioning

confidence: 99%

“…8 S 7/2 → 6 I J transitions around 275 nm) 2. 3 Thus, an energy match between these two transitions could potentially lead to a Gd 3+ →Cu 2+ electronic excitation transfer, which could reduce emission from the 6 P 7/2 metastable state in Gd 3+ . Furthermore, it may be postulated that if a two‐photon quantum‐cutting process6, 15 takes place from the 6 P 7/2 state, which emits at around 310 nm, energies that are relevant to Cu 2+ absorption in the visible region (d–d transitions) could be reached, and the resonance condition could be fulfilled.…”

Section: Introductionmentioning

confidence: 99%

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Evolution of Actinyl Peroxide Clusters U₂₈ in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies

Liu

Simotwo

Nyman

et al. 2014

Chemistry A European J

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Actinyl peroxide clusters, a unique class of uranyl-containing nanoclusters discovered in recent years, are crucial intermediates between the(UO2)(2+) aqua-ion monomer and bulk uranyl minerals. Herein, two actinyl polyoxometalate nanoclusters of Cs15[(Ta(O2)4)Cs4K12(UO2(O2)1.5)28]⋅20 H2O (CsKU28) and Na6K9[(Ta(O2)4)Rb4Na12(UO2(O2)1.5)28]⋅20 H2O (RbNaU28) were synthesized by incorporating a central Ta(O2)4(3-) anion that templates a hollow shell of 28 uranyl peroxide polyhedra. When dissolved in aqueous solutions with additional electrolytes, those 1.8 nm-size macroanions self-assembled into spherical, hollow, blackberry-type supramolecular structures, as was characterized by laser-light scattering (LLS) and TEM techniques. These clusters are the smallest macroions reported to date that form blackberry structures in solution, therefore, can be treated as valuable models for investigating the transition from simple ions to macroions. Kinetic studies showed an unusually long lag phase in the initial self-assembly process, which is followed by a rapid formation of the blackberry structures in solution. The small cluster size and high surface-charge density are essential in regulating the supramolecular structure formation, as was shown from the high activation energy barrier of 51.2±2 kJ mol(-1). Different countercations were introduced into the system to investigate the effect of ion binding to the length of the lag phase. The current research provides yet another scale of self-assembly of uranyl peroxide complexes in aqueous media.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolution of Actinyl Peroxide Clusters U₂₈ in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies

Liu

Simotwo

Nyman

et al. 2014

Chemistry A European J

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“…Calcium zirconate (CaZrO 3 ) as one of important A 2+ B 4+ O 3 oxides may be traditionally synthesized by solid state reaction method. Up to the present, CaZrO 3 activated by rare earth ions have been reported widely and their luminescent properties are also investigated carefully, such as CaZrO 3 :Tm 3+ [5], CaZrO 3 :Eu 3+ [6], CaZrO 3 :Sm 3+ [7], CaZrO 3 :Tb 3+ [8], CaZrO 3 :Er 3+ [9], CaZrO 3 :Gd 3+ [10], CaZrO 3 :Eu 3+ , Gd 3+ [11], CaZrO 3 :Er 3+ , Ce 3+ [12], and CaZrO 3 :Dy 3+ , Tm 3+ [13]. Eu 3+ ion with a regular 7 F J multiplet as ground multiplet is an efficient activator and one of the most interesting rare earth ions.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, energy transfer, charge compensation and luminescence properties of CaZrO3:Eu3+, Bi3+, Li+ phosphor

Cao

Xiao

Zhang

et al. 2018

J Mater Sci: Mater Electron

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phosphors are synthesized by high-temperature solid-state reaction method in air. Their luminescence properties are researched, compared, and analyzed. CaZrO 3 :Bi 3+ phosphor under excitation at 310 nm emits deep-blue light with chromaticity coordinate (0.1612, 0.0254). CaZrO 3 :Eu 3+ phosphor under excitation at 310 and 395 nm shows red-emitting with chromaticity coordinate (0.6386, 0.3611). CaZrO 3 :Eu 3+ , Bi 3+ phosphor under excitation at 310 nm exhibits a systematically varied hue from deep-blue to red light by changing Eu 3+ ion concentration, and that with excitation at 395 nm only emits red light with chromaticity coordinate (0.6386, 0.3611). The energy transfer process from Bi 3+ to Eu 3+ ions may be indicated by their spectral properties. The optimal Eu 3+ and Bi 3+ ions concentrations are 5 mol% and 0.9 mol%, respectively. The emission intensity CaZrO 3 :Eu 3+ , Bi 3+ phosphor may be enhanced about 1.6 times due to the co-doping Li + ion as charge compensator role. The luminous mechanism of CaZrO 3 :Eu 3+ , Bi 3+ phosphor is explained by the simplified energy level diagrams of Bi 3+ and Eu 3+ ions.

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“…Activating optical materials with Gd 3 þ ions is nowadays attractive for creating suitable sources of ultraviolet (UV) light to be integrated in phototherapy lamps for the treatment of skin diseases [1][2][3][4][5]. Accordingly, approaches are currently sought for enhancing the UV type B (UVB) light (280-320 nm) emission appropriate for the biomedical applications.…”

Section: Introductionmentioning

confidence: 99%

Enhanced UV emission of Gd3+ in glass by Ag+ co-doping

Jiménez

2015

Materials Letters

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Luminescence and EPR studies of ultraviolet light emitting La2Zr2O7:Gd3+ phosphor powder

Cited by 19 publications

References 51 publications

Evolution of Actinyl Peroxide Clusters U₂₈ in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies

Evolution of Actinyl Peroxide Clusters U₂₈ in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies

Synthesis, energy transfer, charge compensation and luminescence properties of CaZrO3:Eu3+, Bi3+, Li+ phosphor

Enhanced UV emission of Gd3+ in glass by Ag+ co-doping

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Luminescence and EPR studies of ultraviolet light emitting La2Zr2O7:Gd3+ phosphor powder

Cited by 19 publications

References 51 publications

Evolution of Actinyl Peroxide Clusters U28 in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies

Evolution of Actinyl Peroxide Clusters U28 in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies

Synthesis, energy transfer, charge compensation and luminescence properties of CaZrO3:Eu3+, Bi3+, Li+ phosphor

Enhanced UV emission of Gd3+ in glass by Ag+ co-doping

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Evolution of Actinyl Peroxide Clusters U₂₈ in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies

Evolution of Actinyl Peroxide Clusters U₂₈ in Dilute Electrolyte Solution: Exploring the Transition from Simple Ions to Macroionic Assemblies