Dualistic temperature sensing in Er3+/Yb3+ doped CaMoO4 upconversion phosphor

Sinha, Sayan; Mahata, Manoj Kumar; Kumar, Kaushal; Tiwari, S.P.; Rai, Vipin

doi:10.1016/j.saa.2016.09.039

Cited by 86 publications

(18 citation statements)

References 45 publications

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“…Sample 1Er-CM shows emission in the greenish region with CIE coordinates (0.27, 0.51), whereas upon increasing the concentration of Er 2 O 3 to 10 mol%, CIE coordinates shift slightly towards greenish-white light with CIE coordinates of (0.29, 0.46). Sinha et al (2017) observed the greater increase of emission intensity of the peak at 531 nm than that at 552 nm in Er-Ybdoped CaMoO 4 phosphors and that the CIE coordinates shift to the green region with the increase in pump power density from 1 to 65 W cm À2 . Dey et al (2016) also reported the increase in green emission with the increase in pump power density from 1.363 to 86.363 W cm À2 in Er 3+ -Tm 3+ -Yb 3+ tridoped CaMoO 4 phosphors.…”

Section: Figure 10mentioning

confidence: 80%

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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: Figure 10mentioning

confidence: 80%

“…The weak emission in the blue region at 410 nm is due to the 2 H 9/2 ! 4 I 15/2 transition of Er 3+ (Sinha et al, 2017;Wang et al, 2017).…”

Section: Optical Absorption Propertiesmentioning

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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“…Because the Δ E between them is about 785 cm –1 , the thermal population can fill the 2 H 11/2 level from the lower 4 S 3/2 level by a thermal excitation process. The relationship between temperature and the integrated intensities of rare earth ions can be expressed by the eq . − Where I is the intensity of luminescence at 0 K, g is the degeneracy of the state, A is a spontaneous emission rate, h is the Planck constant, v is the frequency, k I B is the Boltzmann constant, T is the absolute temperature, and E is quenching activation energy. From the formula , the FIR of 2 H 11/2 and 4 S 3/2 of the Er 3+ ions can be derived and given by Formula . Where I I H and I I S are the integrated intensities are contributed by the 2 H 11/2 - 4 I 15/2 and 4 S 3/2 - 4 I 15/2 transitions, respectively.…”

Section: Resultsmentioning

confidence: 99%

Lanthanide Ion-Doped Bismuth Titanate Nanocomposites for Ratiometric Thermometry with Low Pump Power Density

Pan

Bai

Wang

et al. 2019

ACS Appl. Nano Mater.

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The sensing of temperature is closely related to human life. The noncontact ratio temperature measurement method has extensive applications in biochemical monitoring and industrial production. However, optical detection techniques based on fluorescence intensity ratio (FIR) still face many challenges, such as laser thermal effects, accuracy, and reversibility. In this article, the Yb3+/Er3+-codoped Bi4Ti3O12 nanocrystalline composite has been developed for thermometer. The introduction of Bi4Ti3O12 nanocrystals into the glass matrix exceptionally enhances the upconversion emission of Er3+ ions. The Yb3+/Er3+-codoped Bi4Ti3O12 nanocrystalline composite enables online temperature measurement under low power excitation density (0.75 W/cm2), which can reduce the thermal effect of the laser. In addition, Yb3+/Er3+-codoped nanocrystalline composite has excellent precision of temperature measurement in the temperature range of 293–573 K. The value of absolute sensitivity S a is 5.2 × 10–3. The maximum value of the relative error between the measured temperature and the actual temperature does not exceed 0.4% in the reliability test, and temperature measurement has excellent repeatability. Therefore, the developed Yb3+/Er3+-codoped nanocrystalline composite is a promising candidate for ratiometric thermometry.

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“…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%

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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Dualistic temperature sensing in Er3+/Yb3+ doped CaMoO4 upconversion phosphor

Cited by 86 publications

References 45 publications

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

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

Lanthanide Ion-Doped Bismuth Titanate Nanocomposites for Ratiometric Thermometry with Low Pump Power Density

Area-selective atomic layer deposition of molybdenum oxide

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Dualistic temperature sensing in Er3+/Yb3+ doped CaMoO4 upconversion phosphor

Cited by 86 publications

References 45 publications

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

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

Lanthanide Ion-Doped Bismuth Titanate Nanocomposites for Ratiometric Thermometry with Low Pump Power Density

Area-selective atomic layer deposition of molybdenum oxide

Contact Info

Product

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

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