Spectroscopic and visible luminescence properties of rare earth ions in lead fluoroborate glasses

Anjaiah, G.; Rasool, Sk. Nayab; Kistaiah, P.

doi:10.1016/j.jlumin.2014.10.068

Cited by 57 publications

(12 citation statements)

References 48 publications

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“…The larger Ω 2 parameter is a good indication that the symmetry of the Eu 3+ sites is distorted [23]. On the other hand, Ω 4 is related to the rigidity and stability of the matrix in which the rare earth ions are situated [24,25]. The J-O concepts and steps for the calculation of the λ parameters have been reported in several papers and don't need to be repeated [24,25].…”

Section: Eu 3+ Local Environment and Judd-ofelt Analysismentioning

confidence: 99%

Synthesis and photoluminescence of Eu3+ activated alkali mixed (Li, Na)Y(PO3)4 under VUV-UV excitation

Sebai¹,

Zambón²,

Watras³

et al. 2019

Optical Materials

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One important strategy to further enhance the VUV absorption lies in broadening the light absorption in this VUV wavelength region. The mixing of phosphors is a common solution in the case of obtaining a desired color in the case of WLED. However, the VUV region is very sensitive for the considered materials for such purpose, since the deep penetration is very weak and is very affected by the surface of the grains constituting the phosphor (grain size, morphology) [1]. Consequently the collected fluorescence under VUV excitation is not really representative of the mixture of phosphors when this solution is needed. For this reason, we have explored the possibility to develop strategy where the broadening of the VUV absorption can be reached by one pot synthesis since tunability of the band gap can be allowed simply by modifying the alkali ions in the case of phosphates. Adjusting the ratio between mixed alkali ions in the same material is a promising solution.The luminescence of mixed alkali rare earth cyclo-or poly-phosphates with respective formulas MREP 4 O 12 or MRE(PO 3 ) 4 (M = alkali and RE = rare earth ions) has attracted much attention during the last decades. These compounds are characterized by relatively large cyclic anions or long chains built up by PO 4 3−3tetrahedral connected from each other by at least one or two corners. Such structures are favorable for designing rare-earth (RE)-based

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Section: Eu 3+ Local Environment and Judd-ofelt Analysismentioning

confidence: 99%

Synthesis and photoluminescence of Eu3+ activated alkali mixed (Li, Na)Y(PO3)4 under VUV-UV excitation

Sebai¹,

Zambón²,

Watras³

et al. 2019

Optical Materials

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“…As is generally known, trivalent Eu 3þ ions play important role in practical applications as spectroscopic probe [30e33]. Numerous previously published results were focused on studies done for the optical properties of Eu 3þ -doped lead glasses [34,35], whereas lead-free glass systems with alkaline modifiers MO/MF 2 (M ¼ Ca, Sr, Ba) with Eu 3þ ions are not frequently reported.…”

Section: Introductionmentioning

confidence: 99%

Influence of MO/MF2 modifiers (M = Ca, Sr, Ba) on spectroscopic properties of Eu3+ ions in germanate and borate glasses

et al. 2016

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“…The larger Ω 2 parameter is a good indication that the symmetry of the Eu 3+ sites is distorted [39,40]. On the other hand, Ω 4 is related to the rigidity and stability of the matrix in which the rare earth ions are located [40,41]. The J-O concepts and steps for the calculation of the Ω t parameters have been reported in several papers and do not need to be repeated.…”

Section: -Eu 3+ Doped and Eu 3+ /Yb 3+ Co-doped α-Nayfmentioning

confidence: 99%

Energy transfer and luminescent properties of Eu3+, Tb3+, Eu3+-Yb3+and Tb3+-Yb3+ doped α-NaYF4 nanophosphors prepared by coprecipitation route

et al. 2020

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Cubic α-NaYF 4 nanometer-sized crystals doped with Eu 3+ , Tb 3+ , Yb 3+-Eu 3+ or Yb 3+-Tb 3+ were synthesized by an original coprecipitation route. The obtained nanoparticles exhibited primary particles showing cubic shape with sizes ranging between 35 and 65 nm. The singlyor co-doped nanophosphors exhibited strong red (Eu 3+) or green (Tb 3+) fluorescence upon ultraviolet (UV) or near infrared (NIR) excitation, which resulted respectively from down-or up-conversion processes occurring in their structure. Spectroscopic properties were investigated on the basis of emission spectra as well as luminescence decays. From the emission spectra of Eu 3+ doped samples, the Ω 2 and Ω 4 Judd-Ofelt intensity parameters were calculated. The concentration quenching of the Eu 3+ or Tb 3+ ion emissions in singly-doped or Yb 3+ co-doped α-NaYF 4 were ascribed to resonant cross-relaxations. The main derived interaction between the active ions was evidenced as an electric dipole-dipole one through fitting the decays curves with the Inokuti-Hirayama model. The critical distances and energy transfer microparameters for the transfer processes were given showing very short range interaction. The dependence of integral up-conversion intensity on the NIR energy of the beam power was measured. The results indicated a two-photon process based on a cooperative energy transfer.

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Spectroscopic and visible luminescence properties of rare earth ions in lead fluoroborate glasses

Cited by 57 publications

References 48 publications

Synthesis and photoluminescence of Eu3+ activated alkali mixed (Li, Na)Y(PO3)4 under VUV-UV excitation

Synthesis and photoluminescence of Eu3+ activated alkali mixed (Li, Na)Y(PO3)4 under VUV-UV excitation

Influence of MO/MF2 modifiers (M = Ca, Sr, Ba) on spectroscopic properties of Eu3+ ions in germanate and borate glasses

Energy transfer and luminescent properties of Eu3+, Tb3+, Eu3+-Yb3+and Tb3+-Yb3+ doped α-NaYF4 nanophosphors prepared by coprecipitation route

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