La0.90Dy0.05Nb2O7 nanosheet phosphor and its multilayer films with enhanced host excitation-mediated photoluminescence

Fu, Li-Mei; Lin, Bizhou; Chan, Yi-Lin; Zhang, Ou; Li, Bin; Qu, Hu

doi:10.1016/j.jallcom.2012.01.159

Cited by 8 publications

(2 citation statements)

References 46 publications

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“…The functionality of perovskite nanosheets can be tuned by doping a variety of elements into the A and/or B sites, so these perovskite nanosheets have been studied in such fields as catalysis, electronics, photonics, etc. In particular, photoluminescent perovskite nanosheets have attracted attention as materials for nano-phosphors in optical sensors. − Because the thickness of a monolayer perovskite nanosheet is equal to several atomic layers, the local environment of the emission center is expected to be greatly influenced by ions/molecules adsorbed on the outermost surface of the nanosheet. In other words, the nanosheet structure with ultrathin thickness allows the emission centers in the lattice to exist at sub-nanometer distances from the outermost surface, which could cause the electronic structures of the emission centers to be more sensitive to changes in the surrounding environment than those in bulk materials.…”

Section: Introductionmentioning

confidence: 99%

Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite

Awaya

Ida

2023

Chem. Mater.

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A comprehensive investigation was performed on the photoluminescence properties of monolayer Bi 3+ -substituted ATa 2 O 7 2− (A = Ca, Sr, Bi 0.5 Na 0.5 ). The Bi 3+ center in the A−Ta−O perovskite framework functioned as a luminescence center (λ max = 470−520 nm) under UV-light illumination (λ ex = 250−340 nm). Comparison of the photoluminescence spectra of Bi 3+ in several types of layered ATaand free-standing ATa 2 O 7 2− nanosheet membranes, revealed that the positions of the emission and excitation bands were greatly influenced by the interlayer cation species. The results implied that the photoluminescence properties of Bi 3+ in ATa 2 O 7 2− were sensitive to changes in the electric field surrounding Bi 3+ because of the ultimate thinness of the monolayer ATa 2 O 7 2− nanosheets (1.1−1.2 nm). To further explore the relationship between mechanical stress in Bi 3+ -substituted ATa 2 O 7 2− nanosheets and the emission band of Bi 3+ , changes in the photoluminescence and Raman spectra in response to the curvature radius of free-standing ATa 2 O 7 2− nanosheet membranes were compared. The present study confirmed that two-dimensional nanomaterials could help further the understanding of mechanochromic phenomena in Bi-containing inorganic materials.

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Section: Introductionmentioning

confidence: 99%

Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite

Awaya

Ida

2023

Chem. Mater.

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“…have great potential for application in optical sensors with high thermal, mechanical, and chemical stability. [1][2][3][4][5] The lanthanide and bismuth centers in perovskite nanosheets show strong visible-light emission under UV-light illumination, in which energy transfer occurs due to bandgap absorption in the perovskite framework to the luminescent centers by O 2− -Ln 3+ or O 2− -Bi 3+ charge-transfer transitions. [6] Because all luminescent centers in the perovskite nanosheet framework are located within ≈1 nm of the outermost surface of the nanosheet, the PL properties of the luminescent centers are sensitively influenced by changes in the environment surrounding the nanosheet, including humidity, pH, and mechanical stress.…”

Section: Introductionmentioning

confidence: 99%

Tunable Photoluminescence of Bismuth‐ and Trivalent‐Lanthanide‐Doped Monolayer Perovskite Oxide Nanosheets

Awaya

Hatakeyama

Ida

2023

Advanced Optical Materials

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Multicolor photoluminescent Bi0.4Ln0.1Na0.5Ta2O72− nanosheets (Ln = Eu, Tb, Dy, Sm, La) are prepared by delaminating an Aurivillius‐phase layered perovskite, Bi2.4Ln0.1Na0.5Ta2O9. Both Bi3+ and Ln3+ (except La3+) successfully function as luminescent centers under UV‐light illumination (λex. = 240–340 nm), which result in a photoluminescence color that can be tuned by changing the lanthanide doping. The emission spectra are influenced by pH because the energy distribution to Ln3+ or to Bi3+ is different in acidic or in basic solutions. Freestanding Bi0.4Ln0.1Na0.5Ta2O72− nanosheet membranes are prepared by vacuum filtration, and the relationship between the photoluminescence and structural properties of the nanosheet membranes is investigated. The results indicate that differences in the electron orbitals involved in the photoluminescence of Bi3+ (6s2–6s6p) and Ln3+ (4fn–4fn) influence the responsiveness to changes in the environment surrounding those luminescent centers.

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Synthesis, Structure, and Properties of Dion–Jacobson Double‐Layered Perovskites A′SmNb₂O₇ (A′=Rb, K, Na, Li, H)

Krasheninnikova,

Syrov,

Sorokin

et al. 2024

Eur J Inorg Chem

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Dion‐Jacobson‐type layered perovskite compounds A′SmNb2O7 (A′ = Rb, K, Na, Li, H) were synthesized using solid‐state and ion‐exchange methods. While the parent solid‐state product RbSmNb2O7, has previously been studied, the ion‐exchanged compounds were obtained and studied for the first time. The phase and chemical purity of the compounds were confirmed by X‐ray diffraction (XRD) and energy‐dispersive X‐ray spectroscopy (EDX). The crystal structures of RbSmNb2O7 (I2cm, a=0.54356(1) nm, b=0.53935(1) nm, c=2.1891(5) nm), KSmNb2O7 (I2cm, a=0.53660(7) nm, b=0.54481(6) nm, c=2.1527(1) nm) and LiSmNb2O7 (B2cm, a=0.54546(4) nm, b=0.53567(4) nm, c=2.04582(5) nm) were refined using the Rietveld method. Polyhedral distortions in these structures have been studied in detail. The thermal behavior of the compounds has been determined using differential thermal analysis (DTA), revealing that A′ = Na, Li and H compounds are metastable hydrates, while A′ = Rb and K compounds are stable. The optical band gap, valence band edge, and conduction band edge potentials of the compounds obtained were calculated using diffuse reflection spectroscopy data. A photocatalytic experiment was performed on the degradation of methylene blue under ultraviolet light. All of the samples obtained showed some activity in the reaction of dye photooxidation.

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La0.90Dy0.05Nb2O7 nanosheet phosphor and its multilayer films with enhanced host excitation-mediated photoluminescence

Cited by 8 publications

References 46 publications

Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite

Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite

Tunable Photoluminescence of Bismuth‐ and Trivalent‐Lanthanide‐Doped Monolayer Perovskite Oxide Nanosheets

Synthesis, Structure, and Properties of Dion–Jacobson Double‐Layered Perovskites A′SmNb₂O₇ (A′=Rb, K, Na, Li, H)

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La0.90Dy0.05Nb2O7 nanosheet phosphor and its multilayer films with enhanced host excitation-mediated photoluminescence

Cited by 8 publications

References 46 publications

Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite

Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite

Tunable Photoluminescence of Bismuth‐ and Trivalent‐Lanthanide‐Doped Monolayer Perovskite Oxide Nanosheets

Synthesis, Structure, and Properties of Dion–Jacobson Double‐Layered Perovskites A′SmNb2O7 (A′=Rb, K, Na, Li, H)

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Synthesis, Structure, and Properties of Dion–Jacobson Double‐Layered Perovskites A′SmNb₂O₇ (A′=Rb, K, Na, Li, H)