The trapping of Gd3+ excitation energy by Cr3+ and rare earth ions in GdAlO3

Vries, A.J. De; Smeets, W. J. J.; Blasse, G.

doi:10.1016/0254-0584(87)90113-1

Cited by 44 publications

(43 citation statements)

References 18 publications

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“…by Gd 3 § traps (20,21). Our present results show that the Eu 3 § activators with their effective trapping ability are able to dominate the trapping action of the Gd 3 § traps.…”

Section: (A) Emission Spectra Of Srgd2beos At 42 40 and 50 K T Imentioning

confidence: 60%

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The Luminescence of Several Activators in SrLa2BeO5, a Partially Disordered Compound

Blasse

Dirksen

1989

J. Electrochem. Soc.

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The luminescence of nominally pure Eu 3+, Tb 3+, Sm 3+, Ce 3+, Pb 2 § and Bi3+-activated SrLa2BeO5 are reported and discussed. Comparisons with SrGd2BeO~ are made. The host lattice emission is ascribed to self-trapped excitons on the gen ions. The trivalent activators show two luminescent centers, the Pb ~+ only one. This agrees with the crystal structure data. The two Eu ~ § centers show very different luminescence characteristics. The charge transfer bands are at different positions, the emissions are different, the coupling with the Be-O vibration differs, and the amount of ~D1 emission is not equal. The Sm ~ § charge transfer band is at low energy. The 4f-5d transitions of Tb 3+ and Ce 3+ are also at low energy, resulting, for example, in a green Ce 3+ emission. Between the two Bi 3+ centers an efficient energy transfer has been observed (Rc = 22A).Recently SchrSder and Milller-Buschbaum reported the existence of a new compound SrLa2BeO5 (1). Single crystals were prepared by heating with a CO2 laser, and the crystal structure was determined. This structure is of a new type. The authors showed later that other compounds also have this structure, for example CaLa2BeOs, CaY2BeOs, BaLa2BeOs, and BaGd2BeO5 (2).The Be 2 § ions are in tetrahedral coordination. One half of the La 3 § ions are in a complicated (7 + 1) coordination. This is La(I) with seven oxygen ions at 2.57/~ or less, and one other at 2.94A. The other half of the La 3 § ions are, together with the Sr 2 § ions, on another site which is called Sr/La(II). This site has nine coordination. It has the shape of a trigonal prism with three additional oxygen ions above the rectangular prism planes. These prisms form a Kagom~ lattice. The BeO4 tetrahedra and the La(I) polyhedra are in the tunnels of the Kagom~ lattice. The Sr/La(II) site is occupied in a statistical way. One of the oxygen ions, viz., O(II), is not coordinated to beryllium, but only to the ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.100.58.76 Downloaded on 2014-11-01 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.100.58.76 Downloaded on 2014-11-01 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 129.100.58.76 Downloaded on 2014-11-01 to IP

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“…by Gd 3 § traps (20,21). Our present results show that the Eu 3 § activators with their effective trapping ability are able to dominate the trapping action of the Gd 3 § traps.…”

Section: (A) Emission Spectra Of Srgd2beos At 42 40 and 50 K T Imentioning

confidence: 60%

“…This has been discussed at length elsewhere (20,21). This has been discussed at length elsewhere (20,21).…”

Section: Xmentioning

confidence: 87%

The Luminescence of Several Activators in SrLa2BeO5, a Partially Disordered Compound

Blasse

Dirksen

1989

J. Electrochem. Soc.

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“…Considering that the Gd 3 + luminescence usually exhibits decay times on the order of a few milliseconds, due to the forbidden nature of f -f transition, it is expected that W G 400 s group separates each nearest neighbor Gd ions, yielding a relatively large nearest Gd-Gd distance of 5.9 A , . On the other hand, the distance between Gd-Eu pairs is only 3.8 A , in GdAlO 3 :Eu [9]. The large interionic distance in Al 3 GdB 4 O 12 :Eu naturally leads to a lower energy transfer rate, because the energy transfer rate is a strongly decaying function of interionic distance [10].…”

Section: Resultsmentioning

confidence: 99%

Photoluminescence properties of Al3GdB4O12:Eu phosphors

Park

Lee

Summers

et al. 2000

Materials Science and Engineering: B

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An investigation is reported of the photoluminescence (PL) properties of Al 3 GdB 4 O 12 :Eu phosphors. Under vacuum ultraviolet excitation, Al 3 GdB 4 O 12 :Eu exhibited a bright red luminescence with CIE chromaticity coordinates of (0.643, 0.356) with a PL intensity of 60% of the sodium salicylate standard. The PL spectrum showed a ground state splitting pattern consistent with D 3 symmetry. The PL excitation spectrum showed sharp lines due to the 8 S 7/2 -6 I J and 6 P J transitions of Gd 3 + in addition to the f-f transitions of Eu 3 + . The charge transfer band of Eu was observed at 250 nm and the host absorption band was detected at 157 nm. Time-resolved spectroscopy was performed to investigate the interaction between Gd and Eu ions. The energy transfer rate from Gd to Eu ions was found to be 17 000 s − 1 .

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“…A high transfer rate requires an overlap between the emission spectrum of Ce 3+ with the absorption spectrum of the other centre. This type of transfer is well known in Ce 3+ -doped Gd 3+ -based compounds [34]. In the third case, the electron in the 5d state of Ce 3+ is promoted to one of its nearest or nextnearest neighbors.…”

Section: Quenching Mechanisms Of Cementioning

confidence: 92%

Thermal quenching of Ce³⁺emission in PrX₃(X = Cl, Br) by intervalence charge transfer

Birowosuto

Dorenbos

Eijk

et al. 2007

J. Phys.: Condens. Matter

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The cause of the relatively low scintillation light yield of PrBr 3 :Ce 3+ is investigated by means of optical spectroscopy, the temperature dependence of scintillation properties and the temperature dependence of optically excited decay curves of undoped and Ce 3+ -doped PrCl 3 and PrBr 3 . The integrated intensity of x-ray excited luminescence of PrBr 3 :5% Ce 3+ shows that the light yield at room temperature (RT) is two times less than at 80 K. The decay time of Ce 3+ emission optically excited to its 5d band in PrBr 3 :5% Ce 3+ has a single exponential decay of 11.0 ± 1.1 and 6.0 ± 0.6 ns at 10 K and RT, respectively. It is proposed that Ce 3+ emission is quenched by a metal-to-metal charge transfer of Ce 3+ + Pr 3+ → Ce 4+ + Pr 2+ followed by 4f → 4f emission of Pr 3+ which is strongly concentration quenched.

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The trapping of Gd3+ excitation energy by Cr3+ and rare earth ions in GdAlO3

Abstract: The trapping of Gd3+ excitation energy bgse;;,1 ;ap;;lj+io;cEr3+ GdA103 is reported. The activator ions are Cr and Tm3+. If a broad, allowed absorption band o; the ktivaior ov:rlaps with the

Cited by 44 publications

References 18 publications

The Luminescence of Several Activators in SrLa2BeO5, a Partially Disordered Compound

The Luminescence of Several Activators in SrLa2BeO5, a Partially Disordered Compound

Photoluminescence properties of Al3GdB4O12:Eu phosphors

Thermal quenching of Ce³⁺emission in PrX₃(X = Cl, Br) by intervalence charge transfer

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The trapping of Gd3+ excitation energy by Cr3+ and rare earth ions in GdAlO3

Abstract: The trapping of Gd3+ excitation energy bgse;;,1 ;ap;;lj+io;cEr3+ GdA103 is reported. The activator ions are Cr and Tm3+. If a broad, allowed absorption band o; the ktivaior ov:rlaps with the

Cited by 44 publications

References 18 publications

The Luminescence of Several Activators in SrLa2BeO5, a Partially Disordered Compound

The Luminescence of Several Activators in SrLa2BeO5, a Partially Disordered Compound

Photoluminescence properties of Al3GdB4O12:Eu phosphors

Thermal quenching of Ce3+emission in PrX3(X = Cl, Br) by intervalence charge transfer

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Thermal quenching of Ce³⁺emission in PrX₃(X = Cl, Br) by intervalence charge transfer