Red luminescence of Ce3+ due to the large stokes shifts in Y2O2S and Lu2O2S

Yokono, S.; Abe, Toru; Hoshina, Takuya

doi:10.1016/0022-2313(81)90279-9

Cited by 43 publications

(23 citation statements)

References 6 publications

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“…With Ce 3+ doping, the same TL glow peak temperature as with Tb 3+ and Pr 3+ doping in Lu 2 O 2 S is observed in Figure 8a. For Ce 3+ doping in La 2 O 2 S:Ce 3+ and Gd 2 O 2 S:Ce 3+ the Ce 3+ emission totally quenched 26 and no TL glow peaks were measured.…”

Section: Resultsmentioning

confidence: 94%

Charge Carrier Trapping Processes in RE₂O₂S (RE = La, Gd, Y, and Lu)

2017

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Two different charge carrier trapping processes have been investigated in RE2O2S:Ln3+ (RE = La, Gd, Y, and Lu; Ln = Ce, Pr, and Tb) and RE2O2S:M (M = Ti4+ and Eu3+). Cerium, praseodymium and terbium act as recombination centers and hole trapping centers while host intrinsic defects provide the electron trap. The captured electrons released from the intrinsic defects recombine at Ce4+, Pr4+, or Tb4+ via the conduction band. On the other hand, Ti4+ and Eu3+ act as recombination centers and electron trapping centers while host intrinsic defects act as hole trapping centers. For these codopants we find evidence that recombination is by means of hole release instead of electron release. The released holes recombine with the trapped electrons on Ti3+ or Eu2+ and yield broad Ti4+ yellow-red charge transfer (CT) emission or characteristic Eu3+ 4f–4f emission. We will conclude that the afterglow in Y2O2S:Ti4+, Eu3+ is due to hole release instead of more common electron release.

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Section: Resultsmentioning

confidence: 94%

Charge Carrier Trapping Processes in RE₂O₂S (RE = La, Gd, Y, and Lu)

2017

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“…Its reflection spectrum shows a broad absorption band with a maximum at 325 nm and a tail extending into the visible. Green emitting Y202S-Ce 3+ is quenched above 170 K (29). From the spectral data a value for Rc was calculated (critical distance for Ce~+---~ Ce 4+ transfer) of some 8A using methods described elsewhere (20).…”

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

confidence: 99%

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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“…The luminescence of Ce 3+ ion, which is due to the 5d-4f electric dipole allowed transition, has short afterglow in many hosts and therefore the Ce-doped scintillators can promote the ability of detectors to resolve signals. Because Lu 3+ is the heaviest trivalent lanthanide ion and Lu 2 O 2 S has a density high as 9.02 g/cm 3 , which is heavier than most widely used scintillaors such as Bi 4 Ge 3 O 12 (BGO)(7.13 g/ cm 3 ) and novelties such as Lu 2 SiO 5 (LSO)(7.35 g/cm 3 [4]. On the other hand, in the literature information about the luminescence of Lu 2 O 2 S:Ce is very little and barely one article, by Yokono et al [3], has been found dealing with low temperature (below 170 K) luminescence (red).…”

Section: Introductionmentioning

confidence: 99%