Mechanism of the reduction and energy transfer between Eu2+ and Eu3+ in Eu-doped CaAl2Si2O8 materials prepared in air

Dai, Wubin

doi:10.1039/c3tc32378a

Cited by 66 publications

(38 citation statements)

References 35 publications

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“…For the glass-ceramics sample GC48, the broad emission band (FWHM¼ 3003 cm À 1 ) of Eu 2 þ was located at 545 nm which is close to the emission wavelength of melilite Ca 2 Al 2 SiO 7 : Eu 2 þ as reported in previous studies [37]. For Eu 2 þ doped anorthite CaAl 2 Si 2 O 8 [38], the broad emission band was located between 420 nm and 475 nm which is far from the band emission of Eu 2 þ in the GC48 sample. The decrease of the FWHM and the blue-shift of the Eu 2 þ emission band are due to the change in the crystal field through the crystallization process.…”

Section: Photoluminescencementioning

confidence: 72%

Synthesis and luminescent properties of Eu3+/Eu2+ co-doped calcium aluminosilicate glass–ceramics

Bouchouicha

Panczer

Ligny

et al. 2016

Journal of Luminescence

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Section: Photoluminescencementioning

confidence: 72%

Synthesis and luminescent properties of Eu3+/Eu2+ co-doped calcium aluminosilicate glass–ceramics

Bouchouicha

Panczer

Ligny

et al. 2016

Journal of Luminescence

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“…(We suggest that it is not from the charge transfer band (CTB) according to the excitation spectra monitoring the meission at 620 nm in Figure .) The similiar research results were also reported in the previous reference . In the emission spectra, for CS0, SS0 and BS0, a broad band emission is observed, which locates at 446.6 (CS0), 516.8 (SS0) and 498.8 nm (BS0), respectively.…”

Section: Resultsmentioning

confidence: 99%

“…The similiar research results were also reported in the previous reference. [35] In the emission spectra, for CS0, SS0 and BS0, a broad band emission is observed, which locates at 446.6 (CS0), 516.8 (SS0) and 498.8 nm (BS0), respectively. Because f-d transitions appear broad band emission general ranging from 400 to 600 nm in different hosts, [37] the broad band emission can be attributed to the typical 4f 6 5d 1 -4f 7 transition of Eu 2+ .…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

“…However, most of the current research focuses on the theory of the self‐reduction process and the influence of Eu 3+ concentration, reaction temperature, different matrices, etc. But the influence of gradual changes of the matrix microstructure and different alkaline‐earth metal ions on the reduction processes is rarely involved in past years.…”

Section: Introductionmentioning

confidence: 99%

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Photoluminescent properties of Eu³⁺‐Eu²⁺ activated MAl₂Si_xO_2x + 4 (M = Mg, Ca, Sr, Ba) phosphors prepared in air

Man

et al. 2017

Luminescence

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In this paper, MAl Si O :Eu /Eu (Eu + Eu = 2%, molar ratio; M = Mg, Ca, Sr, Ba; x = 0, 0.5, 1, 1.5, 2) phosphors with different SiO concentrations (the ratio of SiO to MAl O is n%, n = 0, 50, 100, 150, 200, respectively) were prepared by high-temperature solid-state reaction under atmospheric air conditions. Their structures and photoluminescent properties were systematically researched. The results indicate that Eu ions have been reduced and Eu ions are obtained in air through the self-reduction mechanism. The alkaline earth metal ions and doping SiO strongly affect the crystalline phase and photoluminescent properties of samples, including microstructures, relative intensity of Eu to Eu , location of emission lines/bands. It is interesting and important that the emission color and intensities of europium-doped various phosphors which consist of aluminosilicate matrices prepared under atmospheric air conditions could be modulated by changing the kinds of alkaline earth metal and the content of SiO .

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“…It is well established that for the reduction process the electron is transferred from the host lattice to the rare earth element. 24,25,29 In our case the azo-pyridine group donates the electron to Eu 3+ and the Eu 3+ cation reduces to Eu 2+ through complexation with the azo-pyridine graphene oxide composite (Scheme 1).…”

mentioning

confidence: 95%

Observation of bright green luminescence in an Eu²⁺ complexed graphene oxide composite through reduction of Eu³⁺

et al. 2015

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Red light harvesting with Eu 3+ graphene complexes are well known in the literature. But embedding Eu 2+ in a graphene oxide matrix is a difficult proposition and could be of paramount interest because of emission tunability. Herein, we report the observation of highly visible green luminescence for Eu 2+ which occurs due to the transition between the 4f 7 (8S 7/2 ) ground state and the 4f 6 5d excited state with nanosecond time decay through reduction of Eu 3+ using a simple chemical approach. This newly formed luminescence complex may be used as a major potential candidate for application in optoelectronics and nanobiotechnology.Recently graphene has drawn much attention due to its fascinating optical and electronic properties for application in opto-electronic devices. 1-4 The optical properties of graphene can be tuned using several parameters, such as appropriate functionalization or decoration of nanoparticles or introducing a rare earth element onto a graphene sheet. 5-11 On the other hand, among the various rare earth elements the europium ion is an excellent candidate for the development of red luminescent graphene. Recently, Gupta et al. 12 reported an Eu 3+ complexed red luminescent graphene nanosheet through a solid state reaction. Alternatively, hydrothermally derived luminescent Eu-complexed reduced graphene oxide (RGO) macro-assemblies were successfully prepared by Wang et al. 13 Moreover, preparation of Eu(III)-coupled graphene oxide through a covalent interaction between the carboxylic group of GO and the amine group of phenanthroline derivatives has also been reported. 14 At the same time, a non-covalent approach was employed to synthesize bright red luminescent rare earth complexes functionalized with GO by Cao et al. 15 A successful chemical route attempt was undertaken to develop Eu-acac-phen nanoparticle functionalized GO by Wang et al. 16 As it is, to date most of the research has remained restricted towards the development of an Eu 3+ -GO complex as a potential red light emitter. Limited work has been done with Eu 2+ complexed materials wherein green to yellow broadband luminescence can be expected due to the transition between the 4f 6 5d excited state and the 4f 7 (8S 7/2 ) ground state. In this regard, many techniques have been employed over the years in which host material with Eu 3+ is irradiated in presence of X-rays, g rays, 17 N 2 /H 2 , H 2 , 18 solution combustion 19 for the reduction of Eu 3+ to Eu 2+ in various inorganic hosts. Reduction of Eu 3+ to Eu 2+ is also possible in a normal air atmosphere and a carbon reducing atmosphere as reported by Peng et al. [20][21][22][23] Dai et al., 24 Xie et al. 25 etc. All the previous reduction approaches either need a special atmosphere or high temperature or are very cumbersome to conduct. Therefore, chemical reduction of Eu 3+ to Eu 2+ has been found to draw keen interest in this era. In a recent endeavour Kim et al. 26 demonstrated a facile chemical method using oleic acid and hexadecylamine for the reduction of Eu 3+ to Eu 2+ emb...

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Mechanism of the reduction and energy transfer between Eu²⁺ and Eu³⁺ in Eu-doped CaAl₂Si₂O₈ materials prepared in air

Abstract: CaAl2Si2O8: Eu material prepared under an air atmosphere shows coexistence of two different valence states of Eu as evidenced by the different emitting color (pink and white-bluish).

Cited by 66 publications

References 35 publications

Synthesis and luminescent properties of Eu3+/Eu2+ co-doped calcium aluminosilicate glass–ceramics

Synthesis and luminescent properties of Eu3+/Eu2+ co-doped calcium aluminosilicate glass–ceramics

Photoluminescent properties of Eu³⁺‐Eu²⁺ activated MAl₂Si_xO_2x + 4 (M = Mg, Ca, Sr, Ba) phosphors prepared in air

Observation of bright green luminescence in an Eu²⁺ complexed graphene oxide composite through reduction of Eu³⁺

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Mechanism of the reduction and energy transfer between Eu2+ and Eu3+ in Eu-doped CaAl2Si2O8 materials prepared in air

Abstract: CaAl2Si2O8: Eu material prepared under an air atmosphere shows coexistence of two different valence states of Eu as evidenced by the different emitting color (pink and white-bluish).

Cited by 66 publications

References 35 publications

Synthesis and luminescent properties of Eu3+/Eu2+ co-doped calcium aluminosilicate glass–ceramics

Synthesis and luminescent properties of Eu3+/Eu2+ co-doped calcium aluminosilicate glass–ceramics

Photoluminescent properties of Eu3+‐Eu2+ activated MAl2SixO2x + 4 (M = Mg, Ca, Sr, Ba) phosphors prepared in air

Observation of bright green luminescence in an Eu2+ complexed graphene oxide composite through reduction of Eu3+

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Mechanism of the reduction and energy transfer between Eu²⁺ and Eu³⁺ in Eu-doped CaAl₂Si₂O₈ materials prepared in air

Photoluminescent properties of Eu³⁺‐Eu²⁺ activated MAl₂Si_xO_2x + 4 (M = Mg, Ca, Sr, Ba) phosphors prepared in air

Observation of bright green luminescence in an Eu²⁺ complexed graphene oxide composite through reduction of Eu³⁺