Judd–Ofelt analysis of Tm3+ doped in CaSc2O4 ceramic samples

Georgescu, S.; Ştefan, Angela; Voiculescu, Ana-Maria; Toma, O.

doi:10.1016/j.jlumin.2015.05.025

Cited by 13 publications

(8 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One phosphor that fulfills the design criteria for high efficiency is Ce 3+ -substituted CaSc 2 O 4 , the preparation of which has been reported by using a variety of methods, including laser-heated pedestal growth, , combustion synthesis, or conventional high-temperature methods . This host material (CaSc 2 O 4 ) has also been made luminescent by doping with Eu 2+ , Er 3+ , Ho 3+ , Tm 3+ and by codoping Ce 3+ with Tm 3+ /La 3+ /Tb 3+ and Yb 3+ . It has also been investigated for use as an up-conversion phosphor. − On the basis of X-ray scattering analyses, the host structure, CaSc 2 O 4 , depicted in Figure , contains distorted ScO 6 octahedra that form a three-dimensional network of edge- or corner-sharing polyhedra.…”

Section: Introductionmentioning

confidence: 99%

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce³⁺-Doped CaSc₂O₄, an Efficient Green-Emitting Phosphor

George¹,

Brgoch²,

Pell

et al. 2017

Chem. Mater.

View full text Add to dashboard Cite

Calcium scandate (CaSc 2 O 4 ) substituted with small amounts (<1%) of Ce 3+ is a recently discovered bright-green-emitting phosphor with favorable light absorption and emission properties and robust temperature stability that make it wellsuited for solid-state white-lighting applications. Combined analyses of scattering, solidstate nuclear magnetic resonance (NMR), electron paramagnetic resonance (EPR), and photoluminescence measurements establish the compositional and structural origins of the macroscopic optical properties of this phosphor material. Simultaneous refinements of synchrotron X-ray and neutron diffraction data of Ce 3+ -doped CaSc 2 O 4 enable the average crystal structure to be determined, which is shown to correspond to an exceedingly rigid host structure, as corroborated by density functional theory (DFT) calculations. Such structural rigidity leads to high quantum efficiency, which is optimized by the substitution of as little as 0.5 mol % of Ce 3+ for Ca 2+ ions, with higher extents of Ce 3+ substitution leading to decreased photoluminescent quantum yields. Solid-state 43 Ca and 45 Sc magic-angle spinning (MAS) NMR spectra are sensitive to the effects of the paramagnetic Ce 3+ dopant ions on nearby atoms in the host structure and yield evidence for local structural distortions. EPR measurements provide direct insights on structures of the Ce 3+ ions, as a function of Ce 3+ substitution. The combined scattering and spectroscopic analyses yield detailed new understanding of the local and long-range structures of Ce 3+doped CaSc 2 O 4 , which account for the sensitive composition-dependent optical properties of this important phosphor material.

show abstract

Section: Introductionmentioning

confidence: 99%

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce³⁺-Doped CaSc₂O₄, an Efficient Green-Emitting Phosphor

George¹,

Brgoch²,

Pell

et al. 2017

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…where ε ν ð Þ is the molar absorption at frequency ν (in cm À1 ) that is Theoretically, OS (f cal ) were evaluated using modified J-O theory as reported in the literature [28][29][30]. As per this theory, the f cal of an electric dipole transition was calculated using…”

Section: Resultsmentioning

confidence: 99%

Amplification of blue emission of Tm³⁺ ions in Li₂O‐HfO₂‐SiO₂ glass system by means of Au⁰ metallic particles

Devi

Sekhar

Kumar³

et al. 2023

Luminescence

View full text Add to dashboard Cite

Li 2 O-HfO 2 -SiO 2 -Tm 2 O 3 :Au 2 O 3 glass samples (containing fixed content of Tm 2 O 3 and different concentration of Au 2 O 3 ) were prepared and characterized. Bearing of Au 0 metallic particles (MPs) on improving blue emission of thulium ions (Tm 3+ ) ions was explored. Optical absorption (OA) spectra exhibited multiple bands excited from 3 H 6 of Tm 3+ . Additionally, a broad peak in the wavelength range 500-600 nm due to surface plasmon resonance (SPR) of Au 0 MPs was noticed in the spectra. Photoluminescence (PL) spectra (of thulium free glasses) indicated a peak in the visible range due to sp ! d electronic transition of Au 0 MPs. Luminescence spectra of Tm 3+ and Au 2 O 3 co-doped glasses exhibited intense blue emission with substantial increase of intensity with increase of Au 2 O 3 content. Bearing of Au 0 MPs on the reinforcement of blue emission of Tm 3+ was discussed in detail with kinetic rate equations.

show abstract

“…In a series of recent papers [8][9][10][11], we explored the possibility of applying the Judd-Ofelt (JO) analysis [12,13] to materials which, due to their granular structure, scatter the transmitted light. In the JO theory, any electric-dipole transition probability between the energy levels of a trivalent rare-earth ion can be calculated using only three parameters, the JO parameters.…”

Section: Introductionmentioning

confidence: 99%

“…To calibrate the absorption spectra for materials with granular structure, extra measurements are necessary. In [8,10] we used the magnetic-dipole contribution to the 3 H 6 -3 H 5 transition of Tm 3 þ . The lifetime of energy levels known to decay mainly radiatively was used in Refs.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Judd–Ofelt and energy-transfer analysis of Er3+ doped in CaSc2O4 ceramic samples

Georgescu

Ştefan

Toma

2015

Journal of Luminescence

Self Cite

View full text Add to dashboard Cite

Judd–Ofelt analysis of Tm3+ doped in CaSc2O4 ceramic samples

Cited by 13 publications

References 43 publications

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce³⁺-Doped CaSc₂O₄, an Efficient Green-Emitting Phosphor

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce³⁺-Doped CaSc₂O₄, an Efficient Green-Emitting Phosphor

Amplification of blue emission of Tm³⁺ ions in Li₂O‐HfO₂‐SiO₂ glass system by means of Au⁰ metallic particles

Judd–Ofelt and energy-transfer analysis of Er3+ doped in CaSc2O4 ceramic samples

Contact Info

Product

Resources

About

Judd–Ofelt analysis of Tm3+ doped in CaSc2O4 ceramic samples

Cited by 13 publications

References 43 publications

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce3+-Doped CaSc2O4, an Efficient Green-Emitting Phosphor

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce3+-Doped CaSc2O4, an Efficient Green-Emitting Phosphor

Amplification of blue emission of Tm3+ ions in Li2O‐HfO2‐SiO2 glass system by means of Au0 metallic particles

Judd–Ofelt and energy-transfer analysis of Er3+ doped in CaSc2O4 ceramic samples

Contact Info

Product

Resources

About

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce³⁺-Doped CaSc₂O₄, an Efficient Green-Emitting Phosphor

Correlating Local Compositions and Structures with the Macroscopic Optical Properties of Ce³⁺-Doped CaSc₂O₄, an Efficient Green-Emitting Phosphor

Amplification of blue emission of Tm³⁺ ions in Li₂O‐HfO₂‐SiO₂ glass system by means of Au⁰ metallic particles