Rare-earth doped/codoped CaMoO4 phosphors: A candidate for solar spectrum conversion

Verma, Akta

doi:10.1016/j.solidstatesciences.2019.105945

Cited by 24 publications

(24 citation statements)

References 39 publications

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“…3, which shows the separate unit cells of CaMoO 4 and Er 2 O 3 . The earlier studies (Verma & Sharma, 2019b;Almeida et al, 2017;Parchur & Ningthoujam, 2011) on rare-earthdoped (Re = Eu, Er, Sm, Tb, etc.) CaMoO 4 studies found the XRD peaks only due to tetragonal CaMoO 4 and these studies supposed the replacement of Ca ions by rare-earth ions and the unit cell contained CaO 8 and ReO 8 units, along with MoO 4 tetrahedral units (Verma & Sharma, 2019b;Almeida et al, 2017).…”

Section: Figurementioning

confidence: 99%

Structural and optical characterization of Er-doped CaMoO₄down-converting phosphors

Kaur

Kumar

Davessar

et al. 2020

Acta Crystallogr B Struct Sci Cryst Eng Mater

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xEr2O3–(1−x)CaMoO4 (x = 1, 3, 5, 7 and 10 mol%) nanoparticles were synthesized by solid-state sintering at 800°C. X-ray diffraction studies confirmed the tetragonal crystal structure of CaMoO4, while the doped samples show the co-existence of cubic Er2O3 and tetragonal CaMoO4 and rule out the replacement of Ca2+ by Er3+ in the structure. The crystal unit-cell dimensions, phase concentration and atomic position coordinates were determined by Rietveld refinement. The short-range structure of CaMoO4 consists of tetrahedral MoO4 and snub disphenoid deltahedral CaO8 units, while the unit cell of Er2O3 consists of two types of ErO6 octahedral units. All MoO4 units contain Mo—O bonds of equal lengths, whereas two types of slightly different Ca—O bond lengths exist in CaO8. Raman spectra of the doped samples show only Mo—O vibrational modes and the Raman peaks of Er2O3 are masked by Mo—O bond vibrations. CaMoO4 shows bluish-green emission at 500 nm, while Er-doped samples show strong green emission under UV excitation. UV irradiation (380 nm) induces down-conversion green emission at 531 nm and 552 nm and good color purity in 1 mol% Er2O3–CaMoO4 sample which makes it a potential candidate for applications in optical devices.

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Section: Figurementioning

confidence: 99%

Structural and optical characterization of Er-doped CaMoO₄down-converting phosphors

Kaur

Kumar

Davessar

et al. 2020

Acta Crystallogr B Struct Sci Cryst Eng Mater

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“…In this work, DoE was also used to optimize the annealing conditions for CaMoO4:Pr 3+ . Previous studies on CaMoO4:Pr 3+ have lacked a systematic approach to study both the doping levels and annealing conditions [21,112,176,263,264]. We here show that the latter also have an influence on the luminescence and therefore should not be neglected.…”

Section: Discussionmentioning

confidence: 61%

“…To our surprise, this sample showed the most Yb 3+luminescence of them all, meaning that direct transfer from the host to Yb 3+ is indeed taking place. In the existing literature on CaMoO4-based materials as optical converters, there seems to be an assumption that this does not take place, without it actually being investigated [21,265]. A major contribution from our work is that this possibility must also be considered.…”

Section: Discussionmentioning

confidence: 98%

“…ALD is already heavily utilized for deposition of ultrathin back passivation layers within the solar industry [19,20], meaning that important infrastructure is currently established on an industrial scale. This work has focused on using CaMoO4 as a host material [21]. There are already several studies both on the optical properties and synthesis of CaMoO4 [22][23][24][25][26][27][28][29][30], but few where CaMoO4 is made as a thin film or where measures are taken to control the interatomic distances of the dopants.…”

Section: Aim Of Studymentioning

confidence: 99%

“…CaMoO4 has previously been doped with all the lanthanides [22,23,25,[176][177][178][179][180][181][182][183][184] (except the radioactive Pm and Lu, which can also be considered as a d-metal even though IUPAC disagrees), either singledoped or co-doped, for a variety of possible applications, such as solar up-or down-converters [21,183,185], optical temperature sensors [186], lasers [187], light emitting diodes (LEDs) [30], microwave dielectrics [188] or photocatalysts [189].…”

Section: Doped Camoo4mentioning

confidence: 99%

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Area-selective atomic layer deposition of molybdenum oxide

Kvalvik

Borgersen

Hansen

et al. 2020

Journal of Vacuum Science &Amp; Technology A: Vacuum, Surfaces, and Films

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have supervised the work.Per-Anders and Ola, there is no way this thesis could be finished without you. Per-Anders, you are truly an excited person and I have never met anyone so passionate about his or her own field as you. That passion is contagious, and so is your cheerfulness and joy to share your knowledge. Ola, you are the most understanding and supporting person on the planet. Your response time is amazingly fast and you take all stupid and not so stupid questions seriously. You see every find as an opportunity, and that is great. When I saw an ALD system not behaving, only depositing on certain surfaces, you saw the chance to explore an area-selective system. I am so deeply grateful to both of you.I am also very grateful to Øystein Evandt and his insight on Design of Experiments (DoE), that he is always more than willing to share. Moreover, a special thank you goes to Dr. David Wragg for his aid with Pawley refinements and to my co-author on Paper I, Jon Borgersen. Making the world's second smallest university logo would not have been possible without you. Augustinas Galeckas, co-author on Paper III, has my sincere gratitude for a swift response and aiding with various optical measurements.Thank you all.During my many years at NAFUMA I have had a lot of nice colleagues and even shared office with many of you. I have probably been of the more talkative kind of office mate, but I think most of you managed ok. Thanks for making work-life good. Special thanks go to Kristian x2, Leva, Michael and Katja, for particularly good company.The largest thank you goes to the people surrounding me. Luckily, that is a lot of people and I am so blessed to have each and every one of you. I am looking forward to times where we can all gather up for large family dinners again, although fitting 25+ people in our house is kind-of tight. Special thanks go to my parents for their endless support and babysitting. You have thought me persistence, perfectionism and hard work, and always taken for granted that I would be able to reach my goals.Thanks for having that belief, also at times where I lost it myself. A huge thank you goes to my in-laws for cheering and babysitting, including my always calm, positive and caring sister-in-law. I also want to thank the engineers in my family, particularly my grandfather, for inspiring me towards a scientific career. Kaja also deserves a huge thank you, simply for existing. Thanks for being my best friend since we started schooland staying with me until now when I finally finish my formal education.Many times during this process, I have been told that pursuing a PhD whilst having three kids, is something you just don't do. It pisses of my inner feminist, but they do have a point, combining sleepless iv nights, dreadful pregnancies and having to make it home before the kindergarten closes whilst pursuing a phd, is not always a primrose path. My favorite counterargument for this is that children give you the best possible mental timeouts from your work. And trust me, in this process, you need m...

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Synthesis, studies on properties of Eu³⁺/Dy³⁺ co–doped BaMoO₄ nanophosphors via hydrothermal method

Manh,

Xuan,

Hien

et al. 2024

Vietnam Journal of Chemistry

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The article shows the outstanding properties and luminescence ability of Eu3+/Dy3+ co–doped BaMoO4 (BMED) materials, which have been successfully fabricated by the hydrothermal method. The crystalline structure analysis of BMED nanophosphor by X–ray diffraction (XRD) shows that it has a structure single–phase structure, with tetragonal BaMoO4 (JCPDS 029–0193), consist of spherical nanoparticles with a size diameter of 31.79–52.99 nm. The characteristic vibrational modes of molybdate lattice in the Raman spectroscopy confirmed the successful Eu3+/Dy3+ co–doped into the host matrix. The field emission scanning electron microscopy (FE–SEM) image shows that the BMED consists of quite uniform nanoparticle with sizes less than 50 nm. The energy dispersive spectra (EDS) confirm the purity and uniform distribution of elements Eu, Dy, Mo, O, Ba throughout in the solid sample. The BMED nanophosphor has is small bandgap from 2.83 to 3.00 eV. The photoluminescence spectra show that BMED have strong red emission at 616 nm of the transition (5D0 → 7F2) with luminescence lifetime from 0.330 to 1.429 ms. The BMED nanophosphor have potential application for the production of warm wLEDs, agricultural lighting and biomedical marking.

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Rare-earth doped/codoped CaMoO4 phosphors: A candidate for solar spectrum conversion

Cited by 24 publications

References 39 publications

Structural and optical characterization of Er-doped CaMoO₄down-converting phosphors

Structural and optical characterization of Er-doped CaMoO₄down-converting phosphors

Area-selective atomic layer deposition of molybdenum oxide

Synthesis, studies on properties of Eu³⁺/Dy³⁺ co–doped BaMoO₄ nanophosphors via hydrothermal method

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Rare-earth doped/codoped CaMoO4 phosphors: A candidate for solar spectrum conversion

Cited by 24 publications

References 39 publications

Structural and optical characterization of Er-doped CaMoO4down-converting phosphors

Structural and optical characterization of Er-doped CaMoO4down-converting phosphors

Area-selective atomic layer deposition of molybdenum oxide

Synthesis, studies on properties of Eu3+/Dy3+ co–doped BaMoO4 nanophosphors via hydrothermal method

Contact Info

Product

Resources

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Structural and optical characterization of Er-doped CaMoO₄down-converting phosphors

Structural and optical characterization of Er-doped CaMoO₄down-converting phosphors

Synthesis, studies on properties of Eu³⁺/Dy³⁺ co–doped BaMoO₄ nanophosphors via hydrothermal method