Optical spectroscopy and excited state dynamics of CaMoO4:Pr3+

Cavalli, Enrico; Angiuli, Fabio; Boutinaud, Philippe; Mahiou, Rachid

doi:10.1016/j.jssc.2011.11.004

Cited by 38 publications

(24 citation statements)

References 23 publications

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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: 63%

See 1 more Smart Citation

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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Section: Discussionmentioning

confidence: 63%

“…Luckily, CaWO4/ CaMoO4 show promise as hosts for Pr 3+ with low loss due to quenching through the IVCT state [112,113]. The Pr 3+ / Yb 3+ down-conversion pair has already been realized in Gd3(Al, Ga)5O12 [114], LiYF4[106] and YF3 [80].…”

Section: The Pr +3 / Yb 3+ Down-conversion Pairmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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“…Calcium molybdate CaMoO 4 (CMO) belongs to the family of the scheelite structured compounds (space group I4 1 /a, point group 4/m) with general formula ABO 4 (A¼Ca, Sr, Ba; B¼W, Mo), which can be easily activated with rare earth ions. [1,2] CMO crystals had been the object of extensive studies in view of their interesting propertiesthermal, [3] electronic band structures, [4] optical polarized [5] and luminescent. [6][7][8][9] They are suitable for many applications in particular as scintillators [10][11][12] and solid state lasers.…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22] The crystal lattice structure of CMO was detailed described in Ref. [1][2][3][4]14,23] Apart from the room temperature properties, [1,2,4,14,23] the structural properties over the temperature range 12-300 K had been studied by means of high-resolution powder diffraction technique using synchrotron radiation. [3] The studies confirmed the scheelite-type of the CMO structure and did not reveal any structural anomalies in the considered temperature range.…”

Section: Introductionmentioning

confidence: 99%

Characterization of crystal lattice defects in calcium molybdate single crystals (CaMoO₄) by means of X‐ray diffraction topography

et al. 2015

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Calcium molybdate CaMoO 4 crystals are perspective materials for many applications in acoustic-electronics, acoustic-optics and nonlinear optics. They are also used as laser hosts, scintillators, different kinds of substrates and active elements of ionizing radiation detectors. For all these applications large-sized single crystals of high structural quality are required.The samples of CaMoO 4 crystals have been investigated by means of synchrotron white beam topography, monochromatic beam topography and conventional X-ray Lang projection topography. The high-resolution rocking curves have also been taken using synchrotron and conventional arrangements.The topographs showed a rather good crystallographic perfection of the crystals. In particular, they did not reveal any segregation fringes proving high homogeneity of the chemical composition. Relatively high densities (<10 4 cm À2 ) of weak point-like diffraction contrasts were observed, which can be most probably interpreted as dislocation outcrops.The distinct main imperfection of the investigated crystals was variously developed block structure. The evaluation of lattice misorientation was realized by means of projection and section white beam synchrotron radiation topographs. The evaluated misorientation between various blocks was in the range of several arc minutes.

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“…ions show rich emission spectral lines in various hosts. Cavalli et al [19] reported that under optical excitation, Pr 3? ions were populated directly through the ground state absorption from 3 H 4 level to the 3 P J (J = 0, 1, 2), 1 I 6 multiplets or interconfigurational 4f 2 ?…”

Section: Introductionmentioning

confidence: 99%

Enhanced luminous efficiency in Pr3+ activated Ca0.5La(MoO4)2 red phosphor with blue excitation for WLED applications

Krishnan

Thirumalai

Mahalingam

et al. 2015

J Mater Sci: Mater Electron

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In this article, we have investigated the downconversion luminescence properties of Ca 0.5 La(MoO 4 ) 2 doped with trivalent Pr 3? (substitute for La 3? site) and codoped with Mn 2? (substitute for Ca 2? site). The powder X-ray diffraction patterns confirm that the single crystalline phosphor powders belong to the scheelite-type tetragonal crystal structure. The photoluminescence (PL) excitation spectra of Ca 0.5 La(MoO 4 ) 2 :Pr 3? exhibits a charge transfer band centered at 276 nm along with three intense sharp absorption bands identified at 449, 475, and 488 nm which are attributed to the f-f electronic transitions of of Pr 3? , respectively. Upon optical excitation, the depopulation of excited 3 P 0 level into the 3 F 2 lower levels of Pr 3? is governed by radiative transfer of energy, as a result, high intense red emission peak was observed at 647 nm. The change in PL emission intensity as a function of Pr 3? concentrations, Mn 2? concentrations, and different excitation wavelengths have been investigated in detail. Further, the codoping of alkali metal chlorides MCl (M = Na, K, Li) into the Ca 0.5 La(MoO 4 ) 2 :Pr 3? phosphor greatly improves the luminescence intensity of the transition 3 P 0 ? 3 F 2 which can be explained by charge compensation effect. To ensure the colour richness and quality of its emission, the photometric parameters were estimated using spectral energy distribution functions of Ca 0.5 La(MoO 4 ) 2 :Pr 3? .The luminous efficacy of radiation for NaCl codoped Ca 0.5 La(MoO 4 ) 2 :Pr 3? phosphor was estimated to be 154 lm/W and the percentage of luminous efficiency is 23 %.

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Optical spectroscopy and excited state dynamics of CaMoO4:Pr3+

Cited by 38 publications

References 23 publications

Area-selective atomic layer deposition of molybdenum oxide

Area-selective atomic layer deposition of molybdenum oxide

Characterization of crystal lattice defects in calcium molybdate single crystals (CaMoO₄) by means of X‐ray diffraction topography

Enhanced luminous efficiency in Pr3+ activated Ca0.5La(MoO4)2 red phosphor with blue excitation for WLED applications

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Optical spectroscopy and excited state dynamics of CaMoO4:Pr3+

Cited by 38 publications

References 23 publications

Area-selective atomic layer deposition of molybdenum oxide

Area-selective atomic layer deposition of molybdenum oxide

Characterization of crystal lattice defects in calcium molybdate single crystals (CaMoO4) by means of X‐ray diffraction topography

Enhanced luminous efficiency in Pr3+ activated Ca0.5La(MoO4)2 red phosphor with blue excitation for WLED applications

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Characterization of crystal lattice defects in calcium molybdate single crystals (CaMoO₄) by means of X‐ray diffraction topography