Ca2MgSi2O7:Ce3+/Tb3+/Eu3+ phosphors: Multicolor tunable luminescence via Ce3+ → Tb3+, Tb3+ → Eu3+ and Ce3+ → Tb3+ → Eu3+ energy transfers

Ye, Changwen

doi:10.1016/j.jlumin.2019.05.004

Cited by 30 publications

(6 citation statements)

References 29 publications

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“…The decay curve of the green emission at 545 nm under 322 nm excitation conforms to a single-exponential function, while the UCL decay curve conforms to a double-exponential function, which proves that the UCL of Tb-UCMOF involves the energy transfer between the two rare-earth ions. The UCL decay time of the material is 1.8296 ms, which is consistent with the millisecond-level luminescence lifetime results of Tb 3+ in other reports, − and the PL decay time is 1.2585 ms. The longer upconverting lifetime is caused by the energy transfer from Yb 3+ to Tb 3+ .…”

Section: Resultssupporting

confidence: 90%

Yb³⁺-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Jiang

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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In this article, we synthesized a Yb3+-doped two-dimensional (2-D) upconverting Tb metal–organic framework (Tb-MOF) (hereinafter referred to as Tb-UCMOF) by a one-step solvothermal method. The synthesized Tb-UCMOF is composed of stacks of 2-D nanosheets with an average width distributed between 250 and 300 nm, and these nanosheets can be exfoliated by a simple liquid ultrasound method. The structural characteristics of this flaky particle accumulation are confirmed by the type IV adsorption–desorption isotherm with a H3-type adsorption hysteresis loop, and the Brunauer–Emmett–Teller surface of Tb-UCMOF is 143.9257 m2·g–1. Tb-UCMOF has characteristic emissions of Tb3+ which are located at 490, 545, 585, and 621 nm under 980 nm excitation. The upconverting luminescence mechanism is attributed to that Yb3+ absorbs multiple photons and transfers the energy to Tb3+, causing its 4f electrons to jump to the excited state, and then the upconverting emissions are obtained when electrons return to the ground state. Since the Tb-UCMOF nanosheets have high dispersibility and an obvious upconverting luminescent signal, we explored their luminescence sensing properties. The luminescence intensity is found to gradually decrease with the addition of Cu2+, the linear range of Cu2+ sensing is 0–1.4 μM, and the detection limit is 0.16 μM. This rapid, highly selective, and sensitive Cu2+ sensing indicates that 2-D upconverting MOF nanosheets have great application prospects in luminescence sensing and also promote the research of 2-D upconverting MOFs with specific recognition for the application of biological and environmental luminescent sensors.

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Section: Resultssupporting

confidence: 90%

Yb³⁺-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Jiang

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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“…When they used 395 nm as the exciting wavelength, the 593 and 615 nm emissions presented as the two strongest peaks. Also, Ye found that the excitation spectrum of Ca 2 MgSi 2 O 7 :5 mol %Eu 3+ phosphor contained several excitation peaks in the range of 350–550 nm, and the strongest exciting wavelength was 465 nm . As 465 nm was used to excite the Ca 2 MgSi 2 O 7 :5 mol %Eu 3+ phosphor, the emission spectrum contained five emission peaks, which were induced by the transitions of 5 D 0 → 7 F j , where j = 0, 1, 2, 3, 4, and 5.…”

Section: Resultsmentioning

confidence: 98%

“…Also, Ye found that the excitation spectrum of Ca 2 MgSi 2 O 7 :5 mol %Eu 3+ phosphor contained several excitation peaks in the range of 350−550 nm, and the strongest exciting wavelength was 465 nm. 21 As 465 nm was used to excite the Ca 2 MgSi 2 O 7 :5 mol %Eu 3+ phosphor, the emission spectrum contained five emission peaks, which were induced by the transitions of 5 D 0 → 7 F j , where j = 0, 1, 2, 3, 4, and 5. These emission peaks were located in the range of 577− 702 nm, and the Ca 2 MgSi 2 O 7 :5 mol % Eu 3+ phosphor acted as the orange-red emitting phosphor.…”

Section: F I G U R E 1 a S H O W S T H E C H A R A C T E R I S T I C ...mentioning

confidence: 99%

Effect of Synthesis Temperature on the Crystalline Structures and Photoluminescence Properties of the Green-light Ca_1.975Eu_0.025MgSi₂O₇ Phosphors

Liu

Wang

Lin³

et al. 2020

Crystal Growth & Design

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First of all, the Ca1.975Eu0.025MgSi2O7 powder was synthesized at the temperature range of 1150–1350 °C through the solid-state reaction method. The reduction atmosphere (5% H2 + 95% N2) was infused during the synthesis process, and it was removed as the temperature went to 800 °C. Synthesized at 1150 °C, the Ca2MgSi2O7, CaSiO3, and CaMgSiO4 phases coexisted, and the photoluminescence (PL) spectrum had only one broad emission band with centered wavelength of 475 nm (blue light), which was dominated by Eu2+-doped CaSiO3 and CaMgSiO4 phases. As Ca1.975Eu0.025MgSi2O7 powder was synthesized at 1350 °C, only the Ca2MgSi2O7 phase was observed, and Eu2+-doped Ca2MgSi2O7 phase would dominate the only one broad emission band with centered wavelength 529 nm (green light). Synthesized at 1200–1300 °C, the diffraction intensities of CaSiO3 and CaMgSiO4 phases decreased, and that of Ca2MgSi2O7 phase increased; their PL spectra could be broken into a combination of the PL spectra of 1150 °C- and 1350 °C-synthesized Ca1.975Eu0.025MgSi2O7 phosphors. The Ca1.975Eu0.025MgSi2O7 powder was also heated to 1350 °C, and the reduction atmosphere was removed as the temperature went to 1300–800 °C; only one broad emission band with centered wavelength 529 nm was found in these synthesized phosphors. When the reduction atmosphere removing temperature rose, because the concentration of Eu2+ ions decreased, both the emission intensity and decay time decreased.

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“…Ce 3+ has a broad absorption band originating from its parity-allowed 4f–5d transition. It is often used as a sensitizer to improve the luminescence efficiency of other ions (Tb 3+ , Nd 3+ , Eu 3+ , Mn 2+ ) by absorbing UV radiation and then transfers the energy to the luminescence center . Notably, the uranyl ion (UO 2 2+ ) also exhibits a broad absorption band ranging from 350 to 500 nm and usually possesses characteristic emissions in the green-yellow region where electrons of uranyl’s molecular orbitals are excited to the nonbonding U-5f orbitals. − Characteristic emission peaks ranging from 470 to 590 nm (approximately 21,000–17,000 cm –1 ) are emitted, originating from two exciting levels to at least five vibrational levels in the ground state .…”

Section: Introductionmentioning

confidence: 99%

Near-Unity Energy Transfer from Uranyl to Europium in a Heterobimetallic Organic Framework with Record-Breaking Quantum Yield

Zhang

Wang

et al. 2023

J. Am. Chem. Soc.

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Lanthanide organic frameworks (Ln-MOFs) have attracted increasing research enthusiasm as photoluminescent materials. However, limited luminescence efficiency stemming from restricted energy transfer efficiency from the organic linker to the metal center hinders their applications. Herein, a uranyl sensitization approach was proposed to boost the luminescence efficiency of Ln-MOFs in a distinct heterobimetallic uranyl-europium organic framework. The record-breaking photoluminescence quantum yield (PLQY, 92.68%) among all reported Eu-MOFs was determined to benefit from nearly 100% energy transfer efficiency between UO2 2+ and Eu3+. Time-dependent density functional theory and ab initio wave-function theory calculations confirmed the overlap of excited state levels between UO2 2+ and Eu3+, which is responsible for the efficient energy transfer process. Coupled with intrinsically strong stopping power toward X-ray of the uranium center, SCU-UEu-2 features an ultralow detection limit of 1.243 μGyair/s, outperforming the commercial scintillator LYSO (13.257 μGyair/s) and satisfying the requirement of X-ray diagnosis (below 5.5 μGyair/s) in full.

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Ca2MgSi2O7:Ce3+/Tb3+/Eu3+ phosphors: Multicolor tunable luminescence via Ce3+ → Tb3+, Tb3+ → Eu3+ and Ce3+ → Tb3+ → Eu3+ energy transfers

Cited by 30 publications

References 29 publications

Yb³⁺-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Yb³⁺-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Effect of Synthesis Temperature on the Crystalline Structures and Photoluminescence Properties of the Green-light Ca_1.975Eu_0.025MgSi₂O₇ Phosphors

Near-Unity Energy Transfer from Uranyl to Europium in a Heterobimetallic Organic Framework with Record-Breaking Quantum Yield

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Ca2MgSi2O7:Ce3+/Tb3+/Eu3+ phosphors: Multicolor tunable luminescence via Ce3+ → Tb3+, Tb3+ → Eu3+ and Ce3+ → Tb3+ → Eu3+ energy transfers

Cited by 30 publications

References 29 publications

Yb3+-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Yb3+-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Effect of Synthesis Temperature on the Crystalline Structures and Photoluminescence Properties of the Green-light Ca1.975Eu0.025MgSi2O7 Phosphors

Near-Unity Energy Transfer from Uranyl to Europium in a Heterobimetallic Organic Framework with Record-Breaking Quantum Yield

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Product

Resources

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Yb³⁺-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Yb³⁺-Doped Two-Dimensional Upconverting Tb-MOF Nanosheets with Luminescence Sensing Properties

Effect of Synthesis Temperature on the Crystalline Structures and Photoluminescence Properties of the Green-light Ca_1.975Eu_0.025MgSi₂O₇ Phosphors