Quantum efficiency and energy transfer processes in rare-earth doped borate glass for solid-state lighting

Steudel, Franziska; Loos, Sebastian; Ahrens, B.; Schweizer, Stefan

doi:10.1016/j.jlumin.2015.07.032

Cited by 56 publications

(13 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The quantum efficiency of nanocrystalline powder of Lu

_{2}

_{3}

:Eu

^{3 +}

reaches 90% [54] and that of bulk Y

_{2}

_{3}

:Eu

^{3 +}

of 92% [55]. In borate and in fluorozirconate glass, the Eu

^{3 +}

quantum efficiency was determined to be 86% [56] and 94% [57], respectively.…”

Section: The Lanthanide Ions Eu2+/eu3+ and Their Optical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

Steudel

Johnson

et al. 2018

Materials

Self Cite

View full text Add to dashboard Cite

The application of Mössbauer spectroscopy to luminescent materials is described. Many solids doped with europium are luminescent, i.e., when irradiated with light they emit light of a longer wavelength. These materials therefore have practical applications in tuning the light output of devices like light emitting diodes. The optical properties are very different for the two possible valence states Eu2+ and Eu3+, the former producing ultraviolet/visible light that shifts from violet to red depending on the host and the latter red light, so it is important to have a knowledge of their behavior in a sample environment. Photoluminescence spectra cannot give a quantitative analysis of Eu2+ and Eu3+ ions. Mössbauer spectroscopy, however, is more powerful and gives a separate spectrum for each oxidation state enabling the relative amount present to be estimated. The oxidation state can be identified from its isomer shift which is between −12 and −15 mm/s for Eu2+ compared to around 0 mm/s for Eu3+. Furthermore, within each oxidation state, there are changes depending on the ligands attached to the europium: the shift is more positive for increased covalency of the bonding ligand X, or Eu concentration, and decreases for increasing Eu–X bond length.

show abstract

“…The quantum efficiency of nanocrystalline powder of Lu

_{2}

_{3}

:Eu

^{3 +}

reaches 90% [54] and that of bulk Y

_{2}

_{3}

:Eu

^{3 +}

of 92% [55]. In borate and in fluorozirconate glass, the Eu

^{3 +}

quantum efficiency was determined to be 86% [56] and 94% [57], respectively.…”

Section: The Lanthanide Ions Eu2+/eu3+ and Their Optical Propertiesmentioning

confidence: 99%

“…More recently, it has been used as a down-converter in photovoltaic application [60,61] and to produce white light in LED’s, also as a co-dopant [56,57,62]. Energy transfer is the key to increase efficiency in both cases, the details of which are discussed within the references given here.…”

Section: The Lanthanide Ions Eu2+/eu3+ and Their Optical Propertiesmentioning

confidence: 99%

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

Steudel

Johnson

et al. 2018

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Rare earth (RE)-doped nanophosphors display unique optical properties that combined with good thermal and chemical stability, make these systems suitable for luminescence and photonic applications [1]. In special, RE-doped barium orthosilicate have been used in solid state lighting devices as white light emitting diode (w-LEDs) [2,3] which are replacing fluorescent and incandescent light sources due to their high energy conversion efficiency resulting in an energy saving, compactness, and long duration time [4,5]. Eu 3+ ion, for instance, is an efficient red emitting activator due to its emission lines that arise from the 5 D 0 excited level to the 7 F J (J = 0, 1, 2, 3, 4, 5, 6) ground levels [6,7].…”

Section: Introductionmentioning

confidence: 99%

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

Bispo‐Jr

Lima

Pires

2018

Journal of Luminescence

View full text Add to dashboard Cite

show abstract

“…Ouchouicha et al [8] prepared Eu 3+ /Eu 2+ co-doped calcium aluminosilicate glassceramics and observed that during heating of the original glass, part of Eu 3+ ions were reduced to Eu 2+ ions. Steudel et al [9] investigated quantum efficiency and energy transfer (ET) processes in rare-earth doped borate glass for solid-state lighting and concluded that for constant Sm 3+ concentration and increasing Eu 3+ doping, the efficiency increases slightly.…”

Section: Introductionmentioning

confidence: 99%

Investigations on Eu3+ Doped Zinc Phosphate Glasses for Photonic Applications

2017

IJCRR

View full text Add to dashboard Cite

Zinc phosphate (ZP) glasses doped with different concentrations of europium (Eu 3+ ) doped were prepared, and their luminescence spectra was investigated. Thermal properties were studied by differential thermal analysis (DTA) measurements. The phase composition of the product was verified by X-ray diffraction analysis. Structural properties were studied by FTIR and Raman spectrum. Optical transition properties of Eu 3+ in the studied zinc phosphate glasses were evaluated in the framework of Judd-Ofelt theory. The radiative transition rates (A R ), fluorescence branching ratios (β), stimulated emission cross-sections (σ e ) and lifetimes (τ exp ) for certain transitions or levels were evaluated. Red emission of Eu 3+ exhibits mainly by the 5 D 0 → 7 F 2 transition located at 612 nm. Concentration quenching was observed from fluorescence spectra. It is found to be that the lifetimes of 5 D 0 level increases with increase in concentration and then decreases. Intense orange-red light emission was obtained for the 2.0 mol% of Eu 3+ ions in zinc phosphate glasses. This approach shows significant promise for use in reddish-orange lighting applications which is useful in photonics field.

show abstract

Quantum efficiency and energy transfer processes in rare-earth doped borate glass for solid-state lighting

Cited by 56 publications

References 23 publications

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

Characterization of Luminescent Materials with 151Eu Mössbauer Spectroscopy

Energy transfer between terbium and europium ions in barium orthosilicate phosphors obtained from sol-gel route

Investigations on Eu3+ Doped Zinc Phosphate Glasses for Photonic Applications

Contact Info

Product

Resources

About