Optical spectroscopy of Eu3+ ions in lithium borate and lithium fluoroborate glasses

Babu, P.; Jayasankar, C.K.

doi:10.1016/s0921-4526(99)00876-5

Cited by 219 publications

(140 citation statements)

References 32 publications

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“…Thus, the emission and luminescence excitation spectra also testify that the europium impurity is incorporated in the Li 2 ions. This agrees well with the data known for the Eu-doped lithium tetraborate crystal [22], the lithium tetraborate glass [31], the lithium borate glasses [20,23,43] and the other borate glasses [24,44,45]. However, the above result does not correlate with the findings for the Eu-doped Li 2 B 4 O 7 [31] and SrB 4 O 7 [29] crystals, the lithium borate glasses [21] and some other borate glasses [28,30].…”

Section: Optical Spectra and Luminescence Kinetics Of The Eu-doped Bosupporting

confidence: 83%

Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium

Padlyak¹,

Kindrat²,

Protsiuk³

et al. 2014

Ukr. J. Phys. Opt.

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Section: Optical Spectra and Luminescence Kinetics Of The Eu-doped Bosupporting

confidence: 83%

Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium

Padlyak¹,

Kindrat²,

Protsiuk³

et al. 2014

Ukr. J. Phys. Opt.

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“…Its value varies between ∼0.9-4.0 in some glass systems and ∼7-10 in CaMoO 4 hosts. 3,45,46 Sohn et al 27 reported the effect of excitation wavelengths at ∼147 nm (host excitation) and 254 nm (Eu-O CT excitation)) on emission intensity and A 21 31 found the higher luminescence intensity at electric dipole transition than that at magnetic dipole transition in glass-ceramic having Eu 3+ doped YPO 4 nano crystals. In addition to Eu 3+ they found the presence of Eu 2+ in glass matrix which results broad emission peak centered at ∼436 nm due to the 5d-4f transition of Eu 2+ .…”

Section: Emission Studymentioning

confidence: 99%

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Parchur¹,

Prasad²,

Bahadur³

et al. 2012

AIP Advances

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This article explores the tuning of blue to pink colour generation from Li+ ion co-doped YPO4:5Eu nanoparticles prepared by polyol method at ∼100-120 °C with ethylene glycol (EG) as a capping agent. Interaction of EG molecules capped on the surface of the nanoparticles and/or created oxygen vacancies induces formation of intermediate/mid gap bands in the host structure, which is supported by UV-Visible absorption data. Strong blue and pink colors can be observed in the cases of as-prepared and 500 °C annealed samples, respectively. Co-doping of Li+ enhances the emission intensities of intermediate band as well as Eu3+. On annealing as-prepared sample to 500 °C, the intermediate band emission intensity decreases, whereas Eu3+ emission intensity increases suggesting increase of extent of energy transfer from the intermediate band to Eu3+ on annealing. Emission intensity ratio of electric to magnetic dipole transitions of Eu3+ can be varied by changing excitation wavelength. The X-ray photoelectron spectroscopy (XPS) study of as-prepared samples confirms the presence of oxygen vacancies and Eu3+ but absence of Eu2+. Dispersed particles in ethanol and polymer film show the strong blue color, suggesting that these materials will be useful as probes in life science and also in light emitting device applications

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“…The fluorescence intensity ratio R of asymmetry in the vicinity of Eu 3z ions and Eu-O covalence. 105 The emission intensity of the 5 D 0 R 7 F 2 electrical dipole transition is more intense in nonsymmetric sites. R also depends on the Judd-Ofelt parameter V 2 , which is used to describe the short range effects.…”

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confidence: 97%

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

Pablos-Martín

Durán

Pascual

2012

International Materials Reviews

150

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Rare earth (RE) doped oxyfluoride glass ceramics possess interesting optical properties with applications in telecommunications and optoelectronics, such as solid state lasers, optical amplifiers, etc. These materials combine the transparency and mechanical and chemical resistance of aluminosilicate glasses with the low phonon energy and facile incorporation of RE ions in the fluoride crystals. The incorporation of RE ions in the crystalline phases enhances the laser emission intensity, a major property of these materials. Transparency is achieved when crystal size is in the nanometric scale, usually below 40 nm, which avoids light scattering. A strict control of the nucleation and crystal growth processes is therefore necessary which requires a deep knowledge of the crystallisation mechanisms. The great activity and publications in this field in the last decades merit a review providing a comparative study of the different nanoglass ceramic systems, their structural and optical characterisation and their main properties and applications. This is the objective of this review paper which includes 232 references. A general discussion on glass nucleation and crystallisation theories and more relevant crystallisation parameters and characterisation techniques are put forward in the first section of the review, focused on nanocrystallisation processes in oxyfluoride systems. In the second section, the principal RE doped glass ceramics are presented. After a general introduction about the luminescence processes, including up-and down-conversion, the behaviour of RE elements in glasses and crystals are discussed. Glass ceramic compositions have been divided as follows: glass ceramics with a glass composition following Wang and Ohwaki's oxyfluoride glass ceramic, 1 ; and glass ceramics with different matrix compositions, arranged by crystalline phases. Relevant properties, mainly optical and laser, are described in each system along with the most relevant applications of these materials.

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Optical spectroscopy of Eu3+ ions in lithium borate and lithium fluoroborate glasses

Cited by 219 publications

References 32 publications

Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium

Optical spectroscopy of Li2B4O7, CaB4O7 and LiCaBO3 borate glasses doped with europium

Observation of intermediate bands in Eu3+ doped YPO4 host: Li+ ion effect and blue to pink light emitter

Nanocrystallisation in oxyfluoride systems: mechanisms of crystallisation and photonic properties

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