Photoluminescence properties of Eu3+-exchanged zeolite L crystals annealed at 700 °C

Li, Huanrong; Ding, Yuhao; Wang, Yu

doi:10.1039/c2ce25179e

Cited by 16 publications

(7 citation statements)

References 35 publications

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“…At higher Eu 3+ doping levels, the characteristic peak of Eu 3+ 3d5/2 (~1134.6 eV) was detected from the as-synthesized compositions (La2Zr2O7:x%Eu 3+ with x = 10 to 35). This value was consistent with that reported on the literature, indicating that the oxidation states of europium ions of all the La2Zr2O7:x%Eu 3+ NPs were +3[62,63]. It also indicated more uniform nature of the europium dopant, which could be further related to the increase in surface…”

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confidence: 92%

Optical and X-ray induced luminescence from Eu3+ doped La2Zr2O7 nanoparticles

Pokhrel

Alcoutlabi

Mao

2017

Journal of Alloys and Compounds

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Nanocrystalline complex oxide scintillators have emerged for use in X-ray and gamma-ray detection in recent years. Here the doping concentration dependence of europium-doped lanthanum zirconate (La2Zr2O7:xmol%Eu 3+ , x = 1 to 35) nanoparticles (NPs) were investigated by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscopy (SEM), and optically and X-ray excited luminescence. Spectroscopic methods revealed a gradual increase in disorder from the ordered pyrochlore structure to the defect fluorite structure as the Eu 3+ concentration increases. They showed red luminescence under charge transfer band (258 nm), band gap (322 nm), and Eu 3+ 4f-4f bands (394 and 465 nm) excitation with optical intensity dependent on the Eu 3+ doping concentration and not quenching up to 5% Eu 3+ doping concentration. The quantum yield of the red emission was found to depend on the Eu 3+ doping concentration and excitation wavelength.Moreover, these La2Zr2O7:x%Eu 3+ NPs demonstrated an atypical Eu 3+ related scintillating response with a red emission under high-energy X-ray excitation with the scintillation intensity also depending on the Eu 3+ doping concentration. Finally, the irradiation damage behavior induced by the excitation source was representatively examined for the La2Zr2O7:5%Eu 3+ NPs. It is expected that the current study will pave the way for future research of nanoscintillators.

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confidence: 92%

Optical and X-ray induced luminescence from Eu3+ doped La2Zr2O7 nanoparticles

Pokhrel

Alcoutlabi

Mao

2017

Journal of Alloys and Compounds

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“…The violet-blue emission band is attributed to Eu 2+ , resulting from the reduction of Eu 3+ located in the channels of ZL. The presence of Eu 2+ species in the channels of ZL was confirmed by XPS as reported by Ding et al, 68 and they also found that the emitting color of the annealed Eu 3+ /ZLs can be controlled by changing the solvents used in the washing step during preparation of the samples. Eu 3+ /ZL crystals washed with deionized water or methanol followed by calcination at 700 °C produce strong violet-blue emission (Fig.…”

Section: Thermal Treatmentsupporting

confidence: 72%

Luminescent materials of zeolite functionalized with lanthanides

Wang

2014

CrystEngComm

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“…For instance, optical properties of zeolites, containing exchanged cations of different metals, have been extensively studied over the last decades. In part, photoluminescence (PL) properties of different zeolites, doped with metal cations such as Cu + , , Ag + , − Eu 2+ /Eu 3+ , , Tb 3+ , Yb 3+ , Er 3+ , Bi 3+ , , and Ga + were reported. The band gap of about 7 eV of the aluminosilicate zeolite framework is similar to that of α-quartz. − The exchanged cations cause new electronic states that can lie within the zeolite band gap region.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence Properties of Indium-Exchanged ZSM-5 Zeolite

Serykh

Rozhdestvenskaya

2015

J. Phys. Chem. C

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Optical properties (optical absorption and photoluminescence) of indium-exchanged ZSM-5 zeolite have been characterized. It has been found for the first time that reduced In-ZSM-5, containing low-valence In + exchanged cations, exhibits efficient ultraviolet and visible-light photoluminescence. The photoluminescence can be induced by the electronic excitation transitions A, B, and C similar to those either in indium halides or in indium-doped alkali halides. The ultraviolet photoluminescence is associated with isolated In + cations, while the visible-light photoluminescence is most probably due to radiative relaxation of In + oligomers or low-dimensional clusters. ■ INTRODUCTIONZeolites are often considered as host materials for different occluded guests, such as small nanoparticles, dyes, complexes, and ions. Zeolites are nanoporous crystalline aluminosilicates with cavity and channel structures. Their framework, which is constructed of SiO 4 and AlO 4 tetrahedra linked through oxygen atoms, can be considered as a large crystalline polyanion which contains either protons or metal cations for charge compensation. Due to unique highly ordered porous and channel structure of zeolites it can be possible to manage a spatial pattern of the guest species to tune their electronic and optical properties. Furthermore, the aluminum content in a zeolite framework defines concentration of charge-compensating cations and can strongly affect their valence state so that zeolites are capable of stabilizing exchanged metal cations in a certain valence state. For instance, optical properties of zeolites, containing exchanged cations of different metals, have been extensively studied over the last decades. In part, photoluminescence (PL) properties of different zeolites, doped with metal cations such as Cu + , 1,2 Ag + , 3−5 Eu 2+ /Eu 3+ , 6,7 Tb 3+ , 8 Yb 3+ , 9 Er 3+ , 10 Bi 3+ , 11,12 and Ga +13 were reported. The band gap of about 7 eV of the aluminosilicate zeolite framework is similar to that of α-quartz. 14−16 The exchanged cations cause new electronic states that can lie within the zeolite band gap region. These cations can interact with each other to form cation pairs or clusters depending on their nature and distance between them.Indium-exchanged ZSM-5 zeolite has attracted much attention from researchers in the last few years since it is considered as a most promising catalyst for NOx reduction by hydrocarbons. 17,18 Indium is usually introduced into zeolites by the reductive solid state ion exchange. For this the hydrogen form of a zeolite is either mixed with In 2 O 3 powder or impregnated with an aqueous solution of indium nitrate with subsequent drying and calcination. After that, the samples are subjected to high-temperature reduction in hydrogen. As a result, the reduced indium species migrate from the external surface into zeolite channels and interact with acidic protons to form exchanged In + cations. 19 Until now optical properties of indium-exchanged zeolites have not been reported in the literature. However, ...

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Photoluminescence properties of Eu3+-exchanged zeolite L crystals annealed at 700 °C

Cited by 16 publications

References 35 publications

Optical and X-ray induced luminescence from Eu3+ doped La2Zr2O7 nanoparticles

Optical and X-ray induced luminescence from Eu3+ doped La2Zr2O7 nanoparticles

Luminescent materials of zeolite functionalized with lanthanides

Photoluminescence Properties of Indium-Exchanged ZSM-5 Zeolite

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