Effect of partially replacement of Gd3+ ions on fluorescence properties of YBO3:Eu3+ phosphor synthesized via precipitation method

Koparkar, K. A.; Bajaj, N. S.; Omanwar, S. K.

doi:10.1016/j.optmat.2014.11.001

Cited by 31 publications

(6 citation statements)

References 20 publications

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“…33 Also, the CIE chromaticity coordinates of YBO 3 :Eu 3+ samples prepared via the solvothermal route at 200, 220 and 240 °C were (0.623, 0.376), (0.622, 0.376) and (0.613, 0.386), respectively. 34 35 and (0.566, 0.393), 36 respectively, which are comparable with the results obtained in this work. A decrease in the luminescence intensity was observed with increase in the calcination temperature from 800 °C to 1200 °C because of thermal quenching; 37 the calculated coordinates revealed that the effect of temperature on chromaticity was almost negligible.…”

Section: Dalton Transactions Communicationsupporting

confidence: 91%

Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu⁺³-doped YBO₃ red phosphor using sodium borohydride

2015

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This research focuses on the effect of the Y : B ratio on phase purity and the development of thermally stable 10 mol% Eu(3+)-doped YBO3 red phosphor nanomaterial using a novel sodium borohydride based solution precursor route. An equimolar concentration of Y and B leads to the development of chemically and thermally stable un-doped and Eu(3+)-doped YBO3 up to 1300 °C. An impurity phase, Y3BO6, was observed at a higher temperature of around 1400 °C. FESEM micrographs indicate that the particles of Eu(3+)-doped YBO3 are agglomerated with peanut-like morphology having an average size of ∼50 nm at 800 °C, whereas the average agglomerated size was in between ∼200 nm and 1.5 μm, at 1200 °C. The particles of Eu(3+)-doped YBO3 are nearly spherical having size ∼8-10 nm at 800 °C and the size increases in the range of ∼30-100 nm at 1200 °C, as observed from TEM micrographs. In addition, the borohydride synthesized Eu(3+)-doped YBO3 phosphor calcined at 800 °C showed comparatively better colour purity (denoted as R/O ratio, i.e. the integral ratio of red to orange emission = 1.25) than the high temperature (1200 °C) calcined sample (R/O ratio = 0.97). Both the calcined powders indicated nearly reddish-orange colour based on calculated Commission Internationale de I'Eclairage (CIE) coordinates. The synthesis strategy followed in the current research work emphasizes the feasibility of synthesizing thermally stable Eu(3+)-doped YBO3 red phosphor materials by a borohydride route, which may be suitable for lighting applications.

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Section: Dalton Transactions Communicationsupporting

confidence: 91%

Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu⁺³-doped YBO₃ red phosphor using sodium borohydride

2015

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“…These results were attributed to the slight decrease in local symmetry around Eu 3+ ions. In the decay spectra in Figure 4d, the red emission ( 5 D 0 → 7 F 2 transition) at 625 nm was determined by the following double-exponential formula 30,31 In the formula, I and I 0 are the luminescence intensities at times t and 0 s and A 1 and A 2 are their fitting parameters. τ 1 and τ 2 indicate the corresponding decay times for the exponential components, especially τ 1 mainly determines the persisting performance of materials.…”

Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Tuning the Doping of Europium in Gadolinium Borate Microparticles at Mesoscale Toward Efficient Production of Red Phosphors

Cui

Wang

et al. 2019

ACS Omega

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The ideal product of rare-earth-doped phosphors should have uniform particle size distribution and homogeneous doping ions in each particle, and therefore, intensified micromixing at mesoscale is highly required. In this article, inspired by the concept of “mesoscience”, we demonstrate the tuning of Eu3+ doping in GdBO3 microparticles at mesoscale by a high-gravity-assisted reactive precipitation-coupled calcination process. The high-gravity environment and tiny droplets generated by the high-gravity rotating packed bed (RPB) reactor lead to significant intensification of mass transfer and micromixing, which are beneficial for the homogeneous doping of Eu3+ in the host material during reactive precipitation in liquid solution. Under excitation at 395 nm, the emission spectra of the Eu3+-doped phosphors exhibit a narrow-band red emission centered at 625 nm and the highest intensity was observed at x = 0.2. The RPB products show higher intensity than that of the control group even when the reaction time was shortened to 1/6. After calculation, the quenching in the sample most likely results from dipole–dipole interactions. The chromaticity coordinates for the RPB sample was measured as (0.598, 0.341) with a quantum yield of up to 78.11%, and the phosphors exhibit good thermal stability at 423 K. The phosphors were used as the luminescent materials for light-emitting diodes (LEDs), and the devices showed good performance. Our preliminary study illustrated that high-gravity-assisted approaches are promising for tuning the doping of rare-earth ions in microparticles at mesoscale toward efficient production of phosphors for LEDs.

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“…From the values, it was clearly observed that as the percentage of Eu 3+ ions increases in YPO 4 : Eu 3+ , the R/O ratio of 5 D 0 → 7 F 2 to 5 D 0 → 7 F 1 transition was linearly increased. Also, the R/O ratio increases by increasing doping concentration of Bi 3+ ions (Eu 3+ ions was fixed) [27,28].…”

Section: Pl Propertiesmentioning

confidence: 99%

Slow evaporation method and enhancement in photoluminescence properties of YPO4 : Eu3+ co-doped with Bi3+ ions

Koparkar

Omanwar

2016

Bull Mater Sci

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The series of Bi 3+ co-doped YPO 4 : Eu 3+ nanophosphors were successfully synthesized by the slow evaporation method. Bi 3+-doped and un-doped YPO 4 : Eu 3+ phosphors were characterized by using powder X-ray diffraction, Fourier transform infrared spectroscopy and field emission scanning electron microscopy. Photoluminescence (PL) properties and decay time of phosphors were studied at room temperature. The YPO 4 : Eu 3+ and Bi 3+ exhibit enhancement in PL intensity and quenched at 0.5 mol% of Bi 3+ ions. Keywords. Slow evaporation method; YPO 4 : Eu 3+ , Bi 3+ ; quenching effect; optical material.

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Effect of partially replacement of Gd3+ ions on fluorescence properties of YBO3:Eu3+ phosphor synthesized via precipitation method

Cited by 31 publications

References 20 publications

Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu⁺³-doped YBO₃ red phosphor using sodium borohydride

Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu⁺³-doped YBO₃ red phosphor using sodium borohydride

Tuning the Doping of Europium in Gadolinium Borate Microparticles at Mesoscale Toward Efficient Production of Red Phosphors

Slow evaporation method and enhancement in photoluminescence properties of YPO4 : Eu3+ co-doped with Bi3+ ions

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Effect of partially replacement of Gd3+ ions on fluorescence properties of YBO3:Eu3+ phosphor synthesized via precipitation method

Cited by 31 publications

References 20 publications

Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu+3-doped YBO3 red phosphor using sodium borohydride

Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu+3-doped YBO3 red phosphor using sodium borohydride

Tuning the Doping of Europium in Gadolinium Borate Microparticles at Mesoscale Toward Efficient Production of Red Phosphors

Slow evaporation method and enhancement in photoluminescence properties of YPO4 : Eu3+ co-doped with Bi3+ ions

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Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu⁺³-doped YBO₃ red phosphor using sodium borohydride

Effect of the Y : B ratio on phase purity and development of thermally stable nano-sized Eu⁺³-doped YBO₃ red phosphor using sodium borohydride