The photoelectron spectra of and the chemical bond in borides

Aleshin, V. G.; Kosolapova, T. Ya.; Nemoshkalenko, V. V.; Serebryakova, T. I.; Chudinov, N.G.

doi:10.1016/0022-5088(79)90089-4

Cited by 24 publications

(9 citation statements)

References 8 publications

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“…Therefore, we observed a positive chemical shift in the Nb 3d 5/2 core level with respect to the Nb metallic for all samples. Similar positive chemical shift are observed in the 3d transition metal borides respect to metals [32]. [6,[36][37][38].…”

Section: Resultssupporting

confidence: 77%

“…Furthermore, it was observed that there is an increase of the BE of B 1s core level in the range 2.00(6) ≤ (B/Nb) XPS ≤ 2.27 (7) and it remained constant for greater concentrations (see Table 1). In all samples a positive chemical shift was calculated with respect to the boron reference sample, contrary to what have been observed for 3d transition metal borides [32]. The maximum positive chemical shift (0.90 eV) was obtained for the compositions (B/Nb) XPS = 2.27(7), 2.31(7) and 2.44 (7).…”

Section: Resultscontrasting

confidence: 70%

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X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB_2+x

Escamilla

Huerta

2006

Supercond. Sci. Technol.

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Polycrystalline samples of NbB 2+x with nominal composition (B/Nb) = 2.0, 2.1, 2.2, 2.3, 2.4 and 2.5 were studied by X-ray photoelectron spectroscopy (XPS). The spectra revealed Nb and B oxides on the surface of the samples, mainly B 2 O 3 and Nb 2 O 5 . After Ar ion etching the intensity of Nb and B oxides decreased. The Nb 3d 5/2 and B 1s core levels associated with the chemical states (B/Nb) were identified and they do not change with etching time. The Binding Energy of the Nb 3d 5/2 and B 1s core levels increase as boron content increases, suggesting a positive chemical shift in the core levels. On the other hand, analysis of Valence Band spectra showed that the contribution of the Nb 4d states slightly decreased while the contribution of the B 2p π states increased as the boron content increased. As a consequence, the electronic and superconducting properties were substantially modified, in good agreement with band-structure calculations.

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Section: Resultssupporting

confidence: 77%

Section: Resultscontrasting

confidence: 70%

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB_2+x

Escamilla

Huerta

2006

Supercond. Sci. Technol.

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“…However, a highly reflective electrode also reflects ambient light that enters the device structure, degrading the visually perceptible contrast of the emitted light, as viewed by an observer. Recently, low ambient light reflectivity has been achieved using an optical interference layer [6][7][8], a semitransparent cathode [9,10], a light absorbing layer [11,12] and a phase-changing layer [13], for example. Hung and Madathil fabricated an OLED with a reflection-reducing layer of zinc oxide, which markedly reduces the ambient light reflected from the cathode [6].…”

Section: Introductionmentioning

confidence: 99%

Enhancing the contrast and power efficiency of organic light-emitting diodes using CuPc/TiOPc as an anti-reflection layer

Li¹,

Su²,

Hwang³

et al. 2007

J. Phys. D: Appl. Phys.

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High contrast ratio and high power efficiency organic light-emitting diodes (OLEDs) using a dual electron transporting layer of copper phthalocyanine (CuPc)/ titanium oxide phthalocyanine (TiOPc) as an anti-reflection layer have been investigated. The OLED configuration comprises indium tin oxide (ITO)/4,4′,4″-tris{N,-(3-methylphenyl)-N-phenylamino}- triphenylamine) (m-MTDATA)/N, N′-diphenyl-N,N′-bis(l-naphthyl-phenyl)-(l,l′-biphenyl)-4, 4′-diamine (NPB)/tris(8-hydroxyquinolino)-aluminium (Alq3)/CuPc/TiOPc/LiF/Al. The contrast ratio of the device with a CuPc/TiOPc anti-reflection layer is about double and the power efficiency higher than that of a conventional device without the anti-reflection layer. The improvement in the power efficiency and the contrast ratio of the device that is obtained using a CuPc/TiOPc anti-reflection layer is attributable to the stepwise electron transporting barrier and the reduced optical reflection from the cathode. The contrast ratio suffices for outdoor display applications.

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“…Such preferred materials include calcium hexaboride (CaB 6 ) and lanthanum nitride (LaN). [4,5] CaB 6 was first selected in this work because it has a better chemical stability against atmospheric corrosion than does LaN. However, the thermal evaporation of CaB 6 required elevated temperatures, and the material decomposed prior to sublimation.…”

mentioning

confidence: 99%

Reduction of Ambient Light Reflection in Organic Light-Emitting Diodes

Hung

Madathil

2001

Adv. Mater.

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The photoelectron spectra of and the chemical bond in borides

Cited by 24 publications

References 8 publications

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB_2+x

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB_2+x

Enhancing the contrast and power efficiency of organic light-emitting diodes using CuPc/TiOPc as an anti-reflection layer

Reduction of Ambient Light Reflection in Organic Light-Emitting Diodes

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The photoelectron spectra of and the chemical bond in borides

Cited by 24 publications

References 8 publications

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB2+x

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB2+x

Enhancing the contrast and power efficiency of organic light-emitting diodes using CuPc/TiOPc as an anti-reflection layer

Reduction of Ambient Light Reflection in Organic Light-Emitting Diodes

Contact Info

Product

Resources

About

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB_2+x

X-ray photoelectron spectroscopy studies of non-stoichiometric superconducting NbB_2+x