Photoconductivity and luminescence in lanthanum oxysulfide

Dobrov, W. I.; Buchanan, R. A.

doi:10.1063/1.1654343

Cited by 22 publications

(12 citation statements)

References 9 publications

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“…6 In fact, Dobrov and Buchanan observed strong photoconductivity in europium-doped lanthanum oxysulfide, where they confirmed that the majority of photocarriers were most likely holes (p type͒. 7 It is thought that this hole conductivity occurs in peculiar sulfur planes. Further experiments and theoretical calculations should be performed in order to verify the above speculation, however.…”

Section: Introductionmentioning

confidence: 90%

First-principles band-structure calculation of yttrium oxysulfide

Mikami

Oshiyama

1998

Phys. Rev. B

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The electronic structure of yttrium oxysulfide (Y 2 O 2 S) is investigated using first-principles pseudopotential calculations by means of the local-density approximation within density-functional theory. It is found that ͑i͒ the material is an indirect band-gap semiconductor, ͑ii͒ the calculated bulk modulus ͑142 GPa͒ is between the one of yttrium oxide and that of yttrium sulfide, ͑iii͒ the top of the valence bands shows anisotropic behavior, and ͑iv͒ substantial covalent bonds between Y and O and less covalent bonds between Y and S coexist in the material. ͓S0163-1829͑98͒01016-9͔

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Section: Introductionmentioning

confidence: 90%

First-principles band-structure calculation of yttrium oxysulfide

Mikami

Oshiyama

1998

Phys. Rev. B

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“…The steady-state equations [5] and [6] would then be modified to include field-dependent term G ~ ~ ajcDj e C~ = [8] ~. In fact the photoconductivity data show that at 300~ a~e is only significant for j -----2, i.e., for the 5D2 state (31). In fact the photoconductivity data show that at 300~ a~e is only significant for j -----2, i.e., for the 5D2 state (31).…”

Section: D~ = [6] Ajc -T-ajmentioning

confidence: 99%

Cathodoluminescence Saturation Phenomena in Y 2 O 2 S : Eu

Robbins

1976

J. Electrochem. Soc.

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POLYCRYSTALLINE BETA ALUMINA RESISTIVITY 1219 served with yttria-con~aining ceramic such as 6G3-2, yttria is considered deleterious to ceramic life. Elimination of yttria yields samples such as 6M2-2 which appear to have approximately equivalent d-c resistivity to yttria-containing material but much smaller grain boundary capacitance. Consequently, the grain boundary (RbCb) resistivity transition in 6M2-2 merges with its intragrain transition. Since the grain boundary response is not single valued and the nature of the intragrain transition unknown, resolution of Rc and Rb is not straightforward. Multifrequency analysis or its equivalent may be of little use in separating intragrain and intergrain resistivity components in such "improved" specimens of polycrystalline beta alumina. ABSTRACTThe importance of a thermal perturbation of Y202S:Eu (0.1%) under excitation by long (up to 30 msec) electron beam pulses is investigated using the measured differential thermal behavior of luminescence lines originating in the 5D2, ~D1, and ado states. An observed droop in light output, equivalent to a saturation of the phosphor brightness, is found to be inconsistent with a thermal perturbation of the system. Other experiments involving a-c electric field modulation of the luminescence from the ~D states suggest that the droop may be caused by electric field perturbation of the system. The saturation characteristics of the phosphor are changed reversibly during a 30 msec pulse, and irreversibly by mixing with a conducting matrix. It is suggested that space-charge fields are generated by trapping of charge in surface states of the phosphor grains, and a simple kinetic model for the saturation mechanism involving field-induced ionization of the charge transfer state and quenching of the 5D2 state is in qualitative agreement with the experimental data. The relevance of the model to sa{uration phenomena and to aging in CRT screens is discussed. ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-11 to IP ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-11 to IP Vol. 123, No. 8 CATHODOLUMINESCENCE SATURATION PHENOMENA ) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 130.126.162.126 Downloaded on 2015-03-11 to IP

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“…With the increase of heated temperature, the slightly increase of TL intensity may be due to black body radiation [25]. A weak TL peaks at around 110 1C in the single Eu 3+ doped Y 2 O 2 S may be due to the localized electrons states of Eu 3+ in Y 2 O 2 S matrix, which has excited states close to the conduction band (about 0.23 eV) to allow its electron to be photoionized into the conduction band [26]. Similar study on the photoionization of the localized electric states for Er 3+ in Y 2 O 3 host has reported by Jia et al [27,28].…”

Section: Resultsmentioning

confidence: 95%