Preparation, band-structure and luminescence of double perovskite Ba2MgMoO6:Eu3+ orange-red phosphor for white LEDs

Zhang, Le; Sun, Bingheng; Shao, Cen; Zhen, Fangzheng; Wei, Shuai; Bu, Wei; Yao, Qing; Jiang, Zhigang; Chen, Hao

doi:10.1016/j.ceramint.2018.06.192

Cited by 43 publications

(9 citation statements)

References 35 publications

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“…The photoluminescence spectrum has sharp emissions at 593 and 613 nm, and is assigned to 5 D 0 → 7 F 1 (the MD transition) and 5 D 0 → 7 F 2 transitions (ED transition), respectively. 95,96 The 5 D 0 → 7 F 2 transition is more enhanced than the 5 D 0 → 7 F 1 levels. As compared to other ions (MoO 4 ) 3− , (VO 4 ) 3− , (WO 4 ) 3− , and (SO 4 ) 3− , the Ca 9 La(PO 4 )(MoO 4 ) 4 (SiO 4 )FCl:1 mol % Eu 3+ red emitting phosphor as a future material for WLEDs, is validated from a CIE coordinate diagram (Figure 18).…”

Section: Phosphor Materials In Host Materialsmentioning

confidence: 98%

Synthesis and Luminescence Characterization of Downconversion and Downshifting Phosphor for Efficiency Enhancement of Solar Cells: Perspectives and Challenges

Satpute

Mehare

Tiwari

et al. 2022

ACS Appl. Electron. Mater.

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Currently, the world is facing an energy crisis. One of the techniques to fulfill the energy demand is to increase the utilization of solar energy. For harvesting solar energy in large amounts, it is essential to develop efficient solar cells. Notably, solar cells (photovoltaic cells) produce electricity from solar energy. The biggest hurdles, however, are the capability and reliability of solar cells. Poor energy density and the spectrum in the bandgap of semiconductor phosphors do not match the energy allocation of the photons in solar spectra lines. These issues and cell efficacy must be addressed before photovoltaic cells can be developed as a viable source of electrical power. The amount of energy generated per unit area depends linearly on cell efficiency. Hence, it makes sense to increase the efficiency rather than enhancing the space for solar cell installation. One well-known method for converting a high-energy photon into two or more lower-energy photons is “downconversion”, which makes use of the wide solar spectrum required for solar cells. The design maximizes the use of the entire sunlight spectrum, improving the efficiency of various solar cell types. This review article surveys how spectrum converters, especially lanthanide-based downconverters and downshifters will be developed. This review focuses on the current materials and methods used to enable the downconversion and downshifting processes in solar cells and some of the challenges in developing solar cells.

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Section: Phosphor Materials In Host Materialsmentioning

confidence: 98%

Synthesis and Luminescence Characterization of Downconversion and Downshifting Phosphor for Efficiency Enhancement of Solar Cells: Perspectives and Challenges

Satpute

Mehare

Tiwari

et al. 2022

ACS Appl. Electron. Mater.

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“…Among these phosphors, the red one shows a lower efficiency, compared with the efficiencies of the blue and green phosphors, and instability due to the release of sulfide gas. Therefore, both of the approaches are in sore need of red-emitting phosphors and much effort has been put into the search for a novel one with excellent optical properties. − …”

Section: Introductionmentioning

confidence: 99%

A New Look at the Explanation of Differences in Properties between La³⁺ and Lu³⁺ Titanate Hosts Occupied by Eu³⁺

et al. 2023

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In order to improve the quality of WLEDs, considerable efforts have been devoted to investigate red phosphor. In this study, two double perovskites La 2 MgTiO 6 and La 2 ZnTiO 6 and two novel pyrochlores Lu 2 MgTiO 6 and Lu 2 ZnTiO 6 doped with 1%Eu 3+ were synthesized by the co-precipitation method. The crystal structure, absorption, excitation, and emission spectra of all samples were investigated in detail. Dissimilar luminescent behaviors of the studied samples were observed. Due to the different site symmetry of Eu 3+ , each compound exhibits a different emission spectrum. The emission of the magnetic dipole transition is dominant in all the spectra of the Lu-based hosts, while the forced electric dipole transition is the strongest one in the spectra of the others. Besides, the ones crystallized in double perovskite structures possess larger bandgaps and show a more intense emission from the 5 D 1 level of Eu 3+ as compared to the pyrochlore compounds. Furthermore, the distinct mechanism of the crossrelaxation of four titanate compounds was investigated. The above findings contribute to the understanding of the two novel pyrochlore hosts.

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“…One of the most promising groups for semicontact temperature readout is double-perovskite materials of the general formula A 2– x A x ′BB′O 6 , where A and A′ sites are occupied by alkaline metals or lanthanides, while positions B and B′ are reserved for transition-metal ions. Recently, the optical properties of many tungstate and molybdate double perovskites have been investigated, such as Ba 2 MgWO 6 , , Ba 2 ZnWO 6 , Ba 2 CuWO 6 , Sr 2 CoWO 6 , Sr 2 CaWO 6 , Sr 2 CaMoO 6 , Ca 3 Mo x W 1– x O 6 , or Ba 2 MgMoO 6 . Tungstate and molybdate (WO 6 /MoO 6 ) groups can exhibit a broad emission band located in the visible region of the electromagnetic spectrum. − Usually the emission of WO 6 /MoO 6 is quenched very quickly with temperature; however, for samples doped with lanthanide ions, such as Eu 3+ , efficient energy transfer from host to dopant occurs .…”

Section: Introductionmentioning

confidence: 99%

“…Recently, the optical properties of many tungstate and molybdate double perovskites have been investigated, such as Ba 2 MgWO 6 , 5,6 Ba 2 ZnWO 6 , 7 Ba 2 CuWO 6 , 8 Sr 2 CoWO 6 , 9 Sr 2 CaWO 6 , 10 Sr 2 CaMoO 6 , 11 Ca 3 Mo x W 1−x O 6 , 12 or Ba 2 MgMoO 6 . 13 Tungstate and molybdate (WO 6 /MoO 6 ) groups can exhibit a broad emission band located in the visible region of the electromagnetic spectrum. 14−16 Usually the emission of WO 6 /MoO 6 is quenched very quickly with temperature; however, for samples doped with lanthanide ions, such as Eu 3+ , efficient energy transfer from host to dopant occurs.…”

Section: ■ Introductionmentioning

confidence: 99%

Optimization of Eu³⁺-to-Host Emission Ratio in Double-Perovskite Molybdenites for Highly Sensitive Temperature Sensors

Bondzior

Dereń

2022

J. Phys. Chem. C

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Double-perovskite phosphors exhibit unusual thermal and luminescent behavior and could potentially be applied as efficient and sensitive luminescent temperature sensors. Four double perovskite hostsBa2MgMoO6 (BMM), Sr2MgMoO6 (SMM), Ba2ZnMoO6 (BZM), and Sr2ZnMoO6 (SZM)are studied for the correlations between the symmetry, energetic structure, luminescence, and thermometric performance. The quantum yield of Eu3+ emission in those hosts is higher for the samples with high cubic symmetry and ranges up to over 20% for Ba2MgMoO6. The Eu3+ ions can be excited indirectly by the host absorption bands in the UV and charge transfer band (CTB) in the blue range. The symmetry of the host plays a crucial role in the thermal stability of the host emission, which together with varying activation energy of Eu3+ luminescence provides a basis for thermometric sensitivity optimization. The relative sensitivities (S r) obtained by the Eu-doped molybdenite hosts are 3.2% at 75 °C for Sr2MgMoO6 and 9.2% at −196 °C for Ba2ZnMoO6. It is also demonstrated that the sensing performance is higher in hosts with a uniform quenching profile of host luminescence and steep quenching of Eu3+ luminescence.

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Preparation, band-structure and luminescence of double perovskite Ba2MgMoO6:Eu3+ orange-red phosphor for white LEDs

Cited by 43 publications

References 35 publications

Synthesis and Luminescence Characterization of Downconversion and Downshifting Phosphor for Efficiency Enhancement of Solar Cells: Perspectives and Challenges

Synthesis and Luminescence Characterization of Downconversion and Downshifting Phosphor for Efficiency Enhancement of Solar Cells: Perspectives and Challenges

A New Look at the Explanation of Differences in Properties between La³⁺ and Lu³⁺ Titanate Hosts Occupied by Eu³⁺

Optimization of Eu³⁺-to-Host Emission Ratio in Double-Perovskite Molybdenites for Highly Sensitive Temperature Sensors

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Preparation, band-structure and luminescence of double perovskite Ba2MgMoO6:Eu3+ orange-red phosphor for white LEDs

Cited by 43 publications

References 35 publications

Synthesis and Luminescence Characterization of Downconversion and Downshifting Phosphor for Efficiency Enhancement of Solar Cells: Perspectives and Challenges

Synthesis and Luminescence Characterization of Downconversion and Downshifting Phosphor for Efficiency Enhancement of Solar Cells: Perspectives and Challenges

A New Look at the Explanation of Differences in Properties between La3+ and Lu3+ Titanate Hosts Occupied by Eu3+

Optimization of Eu3+-to-Host Emission Ratio in Double-Perovskite Molybdenites for Highly Sensitive Temperature Sensors

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Product

Resources

About

A New Look at the Explanation of Differences in Properties between La³⁺ and Lu³⁺ Titanate Hosts Occupied by Eu³⁺

Optimization of Eu³⁺-to-Host Emission Ratio in Double-Perovskite Molybdenites for Highly Sensitive Temperature Sensors