Phase formations and tunable red luminescence of Na2CaMg1−xMnx(PO4)2 (x = 0.05–1.0)

Lü, Juan; Du, Fanghui; Zhu, Rui; Huang, Yanlin; Seo, Hyo Jin

doi:10.1039/c1jm12854j

Cited by 64 publications

(9 citation statements)

References 41 publications

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“…When raising the Eu 2+ level, the fraction of dopant ion at both sites increases, but due to quenching at SrO 10 , most of the emission arises from the SrO 9 site and consequently the emission shifts to longer yellow wavelength. This shift is governed by the ionic size difference between the dopant and host (dopant size<host) and bond strength of oxo‐ligand (Eu 2+ −O; strong bond). Unfortunately, this emission is weak and still insufficient, particularly for S 2 S, due to factors such as replacement of host cations by large amounts of Eu 2+ , crystal field effects, covalence, structural distortion, site symmetry and coordination number etc.…”

Section: Introductionsupporting

confidence: 83%

Yellow Emission from Low Coordination Site of Sr₂SiO₄:Eu²⁺, Ce³⁺: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Mani

Gupta

Ghosh

et al. 2018

Chemistry A European J

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Lanthanide doping through a crystal site engineering approach tunes the emission wavelength suitable for LED applications, but weak emission from low coordination sites remains a huge challenge. Herein the use of a sensitizer is reported to enhance the emission strength and unravel the crystallinity and phase, as this approach demands a large amount of dopants. Doping of Eu ions at SrO and SrO sites of Sr SiO (S S), respectively, tunes the emission from green to yellow and controlled doping of a Ce sensitizer quadruples the quantum efficiency of yellow emission. Remarkably, doping of Eu at the SrO site produces polycrystals, whereas co-doping of Ce and Eu at the same site produces single crystals. DFT calculations further delineate the underlying changes wherein strong interaction of dopant with its neighbours determines the electron density, and thus the crystallinity and phase, rather than usual explanation of aliovalent conditions, which is further substantiated by TEM results. Irrespective of dopant valence, use of large amounts of dopants and their interaction with the host is responsible for the crystallinity and phase change (α'-S S to β-S S). The XPS valence band spectra experimentally evidences the changes in bonding nature of O 2p and O 2s orbitals of silicate and its electron density, due to doping at the two sites. In short, the outcomes resulting from this work could be extended for the development of other two-coordination site lanthanide-doped materials and crystallization of inorganic materials.

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Section: Introductionsupporting

confidence: 83%

Yellow Emission from Low Coordination Site of Sr₂SiO₄:Eu²⁺, Ce³⁺: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Mani

Gupta

Ghosh

et al. 2018

Chemistry A European J

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“…5 Increasing the level of Mn 2+ doping has been effectively applied to improve the emission intensity of Mn 2+ . 10,11 However, the emission intensity of Mn 2+ is found experimentally to be fast and greatly quenched with increasing Mn 2+ doping concentration due to the strong exchange interaction between Mn 2+ -Mn 2+ pairs, especially in a host lattice with perovskite. 12,13 In addition to the concentration quenching among Mn 2+ sub-lattices, the fast decrease in Mn 2+ single-band emission with heavy Mn 2+ doping might be caused by the introduction of other energy-dissipative channels such as extra near-infrared (NIR) emission from the intermediate state.…”

Section: Introductionmentioning

confidence: 99%

Anomalous tunable visible to near infrared emission in the Mn²⁺-doped spinel MgGa₂O₄ and room-temperature upconversion in the Mn²⁺ and Yb³⁺-codoped spinel

Song

Wang

et al. 2014

J. Mater. Chem. C

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“…Detailedly, Mn 2+ ion is a well-studied luminescent center and commercially applicable in lighting and display2223. The emission color of Mn 2+ can be tuned from green to deep red2425, depending on its coordinated chemical environment. It is recently reported by our group that two emission peaks at ~585 nm (visible) and ~770 nm (near infrared) in Mn 2+ doped perovskite fluorides26, which are ascribed to the emission of isolated Mn 2+ and the antiferromagnetic coupling within Mn 2+ -Mn 2+ dimers, respectively.…”

mentioning

confidence: 99%

Interaction between the exchanged Mn2+ and Yb3+ ions confined in zeolite-Y and their luminescence behaviours

Sun

Xiong

et al. 2017

Sci Rep

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Luminescent zeolites exchanged with two distinct and interacted emissive ions are vital but less-studied for the potential applications in white light emitting diodes, solar cells, optical codes, biomedicine and so on. Typical transition metal ion Mn2+ and lanthanide ion Yb3+ are adopted as a case study via their characteristic transitions and the interaction between them. The option is considered with that the former with d-d transition has a large gap between the first excited state 4T1 and the ground state 6A1 (normally >17,000 cm−1) while the latter with f-f transition has no metastable excited state above 10,000 cm−1, which requires the vicinity of these two ions for energy transfer. The results of various characterizations, including BET measurement, photoluminescence spectroscopy, solid-state NMR, and X-ray absorption spectroscopy, etc., show that Yb3+ would preferably enter into the zeolite-Y pores and introduction of Mn2+ would cause aggregation of each other. Herein, cation-cation repulsion may play a significant role for the high valence of Mn2+ and Yb3+ when exchanging the original cations with +1 valence. Energy transfer phenomena between Mn2+ and Yb3+ occur only at elevated contents in the confined pores of zeolite. The research would benefit the design of zeolite composite opto-functional materials.

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Phase formations and tunable red luminescence of Na2CaMg1−xMnx(PO4)2 (x = 0.05–1.0)

Cited by 64 publications

References 41 publications

Yellow Emission from Low Coordination Site of Sr₂SiO₄:Eu²⁺, Ce³⁺: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Yellow Emission from Low Coordination Site of Sr₂SiO₄:Eu²⁺, Ce³⁺: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Anomalous tunable visible to near infrared emission in the Mn²⁺-doped spinel MgGa₂O₄ and room-temperature upconversion in the Mn²⁺ and Yb³⁺-codoped spinel

Interaction between the exchanged Mn2+ and Yb3+ ions confined in zeolite-Y and their luminescence behaviours

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Phase formations and tunable red luminescence of Na2CaMg1−xMnx(PO4)2 (x = 0.05–1.0)

Cited by 64 publications

References 41 publications

Yellow Emission from Low Coordination Site of Sr2SiO4:Eu2+, Ce3+: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Yellow Emission from Low Coordination Site of Sr2SiO4:Eu2+, Ce3+: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Anomalous tunable visible to near infrared emission in the Mn2+-doped spinel MgGa2O4 and room-temperature upconversion in the Mn2+ and Yb3+-codoped spinel

Interaction between the exchanged Mn2+ and Yb3+ ions confined in zeolite-Y and their luminescence behaviours

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Yellow Emission from Low Coordination Site of Sr₂SiO₄:Eu²⁺, Ce³⁺: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Yellow Emission from Low Coordination Site of Sr₂SiO₄:Eu²⁺, Ce³⁺: Influence of Lanthanide Dopants on the Electron Density and Crystallinity in Crystal Site Engineering Approach

Anomalous tunable visible to near infrared emission in the Mn²⁺-doped spinel MgGa₂O₄ and room-temperature upconversion in the Mn²⁺ and Yb³⁺-codoped spinel