Quenching and dipole–dipole interactions in Sr2Al2SiO7:Ce3+ host lattice

Kolte, M.; Pawade, Vijay B.; Dhoble, S.J.

doi:10.1007/s00339-015-9579-0

Cited by 20 publications

(4 citation statements)

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“…The reason why the emission peak was less pronounced for materials containing a higher amount of ceria modifier (i.e., Ce5/Nb 2 O 5 and Ce10/Nb 2 O 5 ) can be related to concentration quenching between Ce 3+ ions, which are highly sensitive for this phenomenon. Kolte et al observed almost the total emission quenching of Sr 2 Al 2 SiO 7 :Ce 3+ phosphors when the concentration of Ce 3+ ion exceeded 2% . Therefore, it would be difficult to expect the emission of Ce 3+ ions in Ce5/Nb 2 O 5 and Ce10/Nb 2 O 5 samples.…”

Section: Resultsmentioning

confidence: 99%

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Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

et al. 2021

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The study provides deep insight into the origin of photocatalytic deactivation of Nb 2 O 5 after modification with ceria. Of particular interest was to fully understand the role of ceria species in diminishing the photocatalytic performance of CeO 2 /Nb 2 O 5 heterostructures. For this purpose, ceria was loaded on niobia surfaces by wet impregnation. The as-prepared materials were characterized by powder X-ray diffraction, nitrogen physisorption, UV–visible spectroscopy, X-ray photoelectron spectroscopy, high-resolution transmission electron microscopy, and photoluminescence measurements. Photocatalytic activity of parent metal oxides (i.e., Nb 2 O 5 and CeO 2 ) and as-prepared CeO 2 /Nb 2 O 5 heterostructures with different ceria loadings were tested in methanol photooxidation, a model gas-phase reaction. Deep insight into the photocatalytic process provided by operando -IR techniques combined with results of photoluminescence studies revealed that deactivation of CeO 2 /Nb 2 O 5 heterostructures resulted from increased recombination of photo-excited electrons and holes. The main factor contributing to more efficient recombination of the charge carriers in the heterostructures was the ultrafine size of the ceria species. The presence of such highly dispersed ceria species on the niobia surface provided a strong interface between these two semiconductors, enabling efficient charge transfer from Nb 2 O 5 to CeO 2 . However, the ceria species supported on niobia exhibited a high defect site concentration, which acted as highly active recombination centers for the photo-induced charge carriers.

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Section: Resultsmentioning

confidence: 99%

“…Kolte et al observed almost the total emission quenching of Sr 2 Al 2 SiO 7 :Ce 3+ phosphors when the concentration of Ce 3+ ion exceeded 2%. 65 Therefore, it would be difficult to expect the emission of Ce 3+ ions in Ce5/Nb 2 O 5 and Ce10/Nb 2 O 5 samples.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

et al. 2021

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“…We have reported BaAl 2 Si 2 O 8 , SrAl 2 SiO 7 , and BaAl 2 SiO 6 phosphors prepared successfully using combustion methods. Details of experimental procedures and the equipment required have been reported previously . For the synthesis of the Ca 2 Al 2 SiO 7 :Sm 3+ ,La 3+ phosphor, we selected Ca(NO 3 ) 3 .4H 2 O (99.9%), Al(NO 3 ) 3 .9H 2 O (99.9%), SiO 2 (99.9%), NH 2 CONH 2 , La(NO 3 ) 3 .6H 2 O, Sm 2 O 3, and Tb 4 O 7, Bi(NO 3 ) 3 .5H 2 O.…”

Section: Methodsmentioning

confidence: 99%

Intense green‐, red‐emitting Tb³⁺, Tb³⁺/Bi³⁺‐doped and Sm³⁺, Sm³⁺/La³⁺‐doped Ca₂Al₂SiO₇ phosphors

Pawade¹,

Kohale²,

Ovhal

et al. 2020

Luminescence

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This paper focuses on an optical study of a Tb 3+ /Bi 3+ -doped and Sm 3+ /La 3+ -doped Ca 2 Al 2 SiO 7 phosphor synthesized using combustion methods. Here, Ca 2 Al 2 SiO 7 :Sm 3 + showed a red emission band under visible light excitation but, when it co-doped with La 3+ ions, the emission intensity was further enhanced. Ca 2 Al 2 SiO 7 :Tb 3+ shows the characteristic green emission band under near-ultraviolet light excitation wavelengths, co-doping with Bi 3+ ions produced enhanced photoluminescence intensity with better colour tunable properties. The phosphor exhibited better phase purity and crystallinity, confirmed by X-ray diffraction. Binding energies of Ca(2p), Al(2p), Si(2p), O(1s) were studied using X-ray photoelectron spectroscopy. The reported phosphor may be a promising visible light excited red phosphor for light-emitting diodes and energy conversion devices. K E Y W O R D SLn 3+ ions, combustion synthesis, X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopyphotoluminescence

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“…Email address: hovantuyen@gmail.com https//doi.org/ 10.25073/2588-1124/vnumap.4594 [1], steady crystalline structure [2]. In some recent studies, Eu 2+ -doped SAS materials have been synthesized to obtain green emission phosphor [3]; long persistent luminescence and thermoluminescence properties of Eu and Ln 3+ (Dy 3+ , Ce 3+ , Tm 3+ ) co-doped into SAS host materials have also reported [4][5][6][7][8]; Energy transfer between Ce 3+ and Dy 3+ , Eu 3+ ions as well as the concentration quenching of Ce 3+ in SAS materials have been studied [9][10][11]. Besides that, the fabrication method for SAS phosphors has been studied and reported in several papers [12,13] and some other studies have focused on the controllable photoluminescence or thermal stablility of the prepared materials [1,14].…”

Section: Introductionmentioning

confidence: 99%

Energy Level Locations of Lanthanide Ions in Strontium-Aluminosilicate Phosphors

Tuyen¹,

Hà²

2021

MaP

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This paper determines the position of energy levels of lanthanide ions in Sr2Al2SiO7 (SAS) phosphor by a combining analysis of the lowest 4f-5d transition of Ce3+ ions and the charge transfer of Eu3+ ions-doped SAS phosphor. The SAS samples were successfully synthesized via solid state reaction, and their structure phase was further confirmed by X-ray diffraction. In the case of Eu3+-doped SAS phosphors, the energy of the charge transfer (CT) transition of the Eu3+ is about 4.70 eV (264 nm) and this energy is applied to determine the position 4f level of all divalent lanthanides relating to the top of the valence band in the SAS host lattice. For Ce3+ activated SAS samples, the lowest 4f1→4f05d1 excitation energy is determined around 3.71 eV (334 nm) and it is used to estimate the lowest 4f-5d transitions for all lanthanide (Ln) ions in host lattice. A broad band emission of the 5d→4f transition of Ce3+ ions includes two peaks emission with different energy about 1997 cm-1 that coincides with the theoretical value of 2000 cm-1. The host referred binding energy (HRBE) diagram of all Ln2+ and Ln3+ ions relating to the valance band of SAS materials has been constructed by using the data of fluorescent properties of Ce3+ and Eu3+ ions. The energy of 4f→5d transitions of Eu2+ ions that was predicted from the energy level scheme matches well with the observed experimental energy.

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Quenching and dipole–dipole interactions in Sr2Al2SiO7:Ce3+ host lattice

Cited by 20 publications

References 22 publications

Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Intense green‐, red‐emitting Tb³⁺, Tb³⁺/Bi³⁺‐doped and Sm³⁺, Sm³⁺/La³⁺‐doped Ca₂Al₂SiO₇ phosphors

Energy Level Locations of Lanthanide Ions in Strontium-Aluminosilicate Phosphors

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Quenching and dipole–dipole interactions in Sr2Al2SiO7:Ce3+ host lattice

Cited by 20 publications

References 22 publications

Unraveling the Origin of Photocatalytic Deactivation in CeO2/Nb2O5 Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Unraveling the Origin of Photocatalytic Deactivation in CeO2/Nb2O5 Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Intense green‐, red‐emitting Tb3+, Tb3+/Bi3+‐doped and Sm3+, Sm3+/La3+‐doped Ca2Al2SiO7 phosphors

Energy Level Locations of Lanthanide Ions in Strontium-Aluminosilicate Phosphors

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Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Unraveling the Origin of Photocatalytic Deactivation in CeO₂/Nb₂O₅ Heterostructure Systems during Methanol Oxidation: Insight into the Role of Cerium Species

Intense green‐, red‐emitting Tb³⁺, Tb³⁺/Bi³⁺‐doped and Sm³⁺, Sm³⁺/La³⁺‐doped Ca₂Al₂SiO₇ phosphors