Energy bands in cuprous oxide

Dahl, Jens Peder; Switendick, A. C.

doi:10.1016/0022-3697(66)90064-3

Cited by 124 publications

(50 citation statements)

References 11 publications

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“…One violet and two blue emission peaks around 421 nm ͑2.94 eV͒, 440 nm ͑2.81 eV͒, and 469 nm ͑2.64 eV͒ are found for the sample CP1 having crystallite diameter ϳ16 nm. These emissions are expected due to the excitonic transitions from the different sub levels of the CB to the Cu d-shells of the VBs, 8,34 which will be discussed later using schematic band diagram. All the peaks were blue shifted with decreasing the size of the nanoparticles, indicating the quantum confinement effect of the excitonic transition expected for Cu 2 O nanoparticles.…”

Section: -mentioning

confidence: 99%

Luminescence properties of the solvothermally synthesized blue light emitting Mn doped Cu2O nanoparticles

Das¹,

Sharma²,

Kumar³

et al. 2010

Journal of Applied Physics

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The Cu 2 O nanoparticles having average crystallite diameters ϳ8 -16 nm were synthesized by a simple solvothermal method. The Mn was doped in the Cu 2 O sample of crystallite size ϳ8 nm. The effects of the size and doping concentration on the crystal structures of the nanoparticles were investigated. The x-ray photoelectron spectroscopy studies clearly showed that the Mn was incorporated into the Cu 2 O lattice as Mn 2+ due to the substitution of the Cu + ions by Mn 2+ ions. The quantum confinement effects were observed in the nanoparticles. The multiple emissions from the Cu 2 O were quenched in the Mn doped nanoparticles and only blue light emitting Cu 2 O nanoparticles were obtained due to the transition 4 T 2 → 6 A 1 of Mn. The effects of the doping concentration and the particle size on the relaxations dynamics of the Cu 2 O nanoparticles were mainly investigated using photoluminescence decay.

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Section: -mentioning

confidence: 99%

Luminescence properties of the solvothermally synthesized blue light emitting Mn doped Cu2O nanoparticles

Das¹,

Sharma²,

Kumar³

et al. 2010

Journal of Applied Physics

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“…The Γ + 6 conduction band in Cu 2 O is formed by Cu 4s orbitals and the Γ + 7 valence band by Cu 3d orbitals [10]. The fivefold degenerate (without spin) Cu 3d orbitals split under the crystal field into a higher threefold Γ + 25 and a lower Γ + 12 twofold degenerate band.…”

Section: A Band Structure Of Cu2o and Optical Propertiesmentioning

confidence: 99%

“…The yellow-series excitons are formed between electrons and holes in these two bands. Since the conduction and valence bands have the same (positive) parity [10] and the dipole moment between them vanishes, the radiative lifetimes of the excitons are relatively long. The n = 1 line in the one-photon absorption spectrum of light is weak due to the equal parity of the conduction and valence bands; the n = 1 lines correspond to excitons with relative angular momentum l = 1 and for this reason the absorption process is dipoleallowed.…”

Section: Introductionmentioning

confidence: 99%

Fine structure of excitons inCu2O

1997

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Three experimental observations on 1s-excitons in Cu2O are not consistent with the picture of the exciton as a simple hydrogenic bound state: the energies of the 1s-excitons deviate from the Rydberg formula, the total exciton mass exceeds the sum of the electron and hole effective masses, and the triplet-state excitons lie above the singlet. Incorporating the band structure of the material, we calculate the corrections to this simple picture arising from the fact that the exciton Bohr radius is comparable to the lattice constant. By means of a self-consistent variational calculation of the total exciton mass as well as the ground-state energy of the singlet and the triplet-state excitons, we find excellent agreement with experiment.

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“…With this lengthy introduction let us now turn to examine the situation that exists in mixed- ) have not yet become pulled down into the semicore [166]. The latter is experienced with divalent Zn compounds at shell closure [167], and especially with trivalent Ga [168].…”

Section: Terminology and Treatment Of Valence And Electronic Configurmentioning

confidence: 99%

Developments in the negative-Umodelling of the cuprate HTSC systems

Wilson

2001

J. Phys.: Condens. Matter

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This paper emphasizes once more the many strands which go into creating the unique and complex nature of the mixed-valent HTSC cuprates, above T c as below. Clearly it is not sensible to look in isolation to the lattice, magnetic or electronic aspects of the situation. Circumstances are too tightly coupled and interdependent. What one is in a position to do is to ascribe some preeminence in these matters. The line taken in this paper, as in its predecessors, is that charge constitutes the prime mover, but this taken within a chemical context, relating to bonding effects in the copper oxides and to a crucial shell-filling negative-U term of large magnitude. What dictates the uniqueness of copper in this is its particular position within the periodic table at the end of the 3dseries. This provides access to (i) three stable valencies, (ii) to the limited metallicity of tightbinding, mixed-valent YBa 2 Cu 3 O 7 , etc., (iii) to the p/d hybridized limitation of magnetic behaviour, and (iv) above all to the shell closure effects, with their dramatic energy adjustments of the relevant double-loading states when sited in high-valent local environment. This behaviour rests on the inhomogeneous electronic and structural conditions existing within these tight-binding mixed-valent systems. Normally such systems show strong positive-U behaviour and are magnetic. Here the shell-filling effects negate this U term to leave a net negative U eff of −3 eV per pair. That positions the bosonic electron pairs degenerate with E F . RVB spin coupling within the stripe phase geometry set up by the doped charge removes much spin-flip pair breaking, while the adopted 2D crystal structure with its saddle-point dominated F.S. provides the ideal k-space geometry from which to secure the negative-U driven pair formation. The Jahn-Teller effect associated with the d 9 electron count is crucial in upholding the two-subsystem nature of the HTSC materials.This paper looks at the support for this scenario that can be extracted from the recent work of Corson, Li, Mook, Valla, Norman, Varma, Gyorffy and many others. To the author it remains a mystery why other researchers have not examined the potential of this route for understanding the unique characteristics of the HTSC cuprates.3

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Energy bands in cuprous oxide

Cited by 124 publications

References 11 publications

Luminescence properties of the solvothermally synthesized blue light emitting Mn doped Cu2O nanoparticles

Luminescence properties of the solvothermally synthesized blue light emitting Mn doped Cu2O nanoparticles

Fine structure of excitons inCu2O

Developments in the negative-Umodelling of the cuprate HTSC systems

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