Spectral and luminescent properties of gold bromides

Babin, Pierre; Voropaev, S. F.; Silukova, T. N.; Troilin, V. I.

doi:10.1007/bf00611841

Cited by 3 publications

(4 citation statements)

References 4 publications

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“…We find that the SOC corrected G 0 W 0 approach enhances these gaps to 3.2 and 2.8 eV for AuBr and AuI, respectively. The experimental absorption measurements of AuBr thin films reveal the first absorption peak lies at 2.97 eV, 54 which is close to the fundamental band gap of 2D AuBr. Taking into account the fact that exciton binding in 3D structures is significantly smaller (in order ∼0.1 eV for bulk MoS 2 ) 55 and the quantum confinement effect, we can expect that theoretical bulk band gap would be close to the experimental one.…”

mentioning

confidence: 70%

Two-Dimensional Gold Halides: Novel Semiconductors with Giant Spin–Orbit Splitting and Tunable Optoelectronic Properties

Kuklin

Gao

Zhang

et al. 2020

J. Phys. Chem. Lett.

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We introduce a new family of 2D materials with unique structure and optoelectronic properties, namely, single-layer gold(I) halides (AuHals). We propose their stability as well as structural, electronic, and optical properties using first-principles calculations. The cleavage energy is found to be similar to that of graphene from graphite, indicating the possibility for mechanical exfoliation. We show that AuHals are stable and have tunable direct (AuBr) and indirect (AuI) band gaps depending on the number of layers. We discuss the possible origin of the giant spin−orbit coupling (SOC) induced conduction band splitting in terms of orbital-decomposed band structure to guide future investigations on the design of materials with highly effective SOC. Exceptionally high excitonic binding energy, high hole mobility, and tunable band gaps indicate that AuHals are promising candidates for optoelectronic devices with excellent performance.

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confidence: 70%

Two-Dimensional Gold Halides: Novel Semiconductors with Giant Spin–Orbit Splitting and Tunable Optoelectronic Properties

Kuklin

Gao

Zhang

et al. 2020

J. Phys. Chem. Lett.

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“…For pure KBr, we have a broad emission band between 400 and 500 nm, which is probably allotted to the color centers [15,16], while for KBr doped with AuBr, Figure 4 shows, in addition to the broad emission band attributed to color centers, a new broad emission band centered on 650 nm (1.91 eV). This band is assigned to the orange luminescence of the AuBr semiconductor [9]. The widening of this emission band is due to the great range in the nanocrystals sizes (Table 1) [1][2][3][4].…”

Section: Optical Propertiesmentioning

confidence: 99%

“…AuBr is one of the interesting materials belonging to the family of gold halide semiconductors. The optical properties of this material were studied by Bobin et al and others in the temperature range 293 −140 K [9]. They found that AuBr presents three absorption bands located at 4.87, 3.35, and 2.97 eV and three emission bands at 2.82, 1.65 −1.55, and 2.03-1.91 eV, respectively.…”

Section: Introductionmentioning

confidence: 97%

“…Emission spectra of pure KBr excited between 330-370 nm.The measurement of the PLE at 650 nm gives the spectrum inFigure 5, which shows an excitation band at 360 nm (3.44 eV), attributed to the absorption band of AuBr nanocrystals. By comparison with the emission band of bulk AuBr (3.35 eV or 370 nm)[9], a small shift of excitation band towards short wavelengths or higher energies was noted. Indeed, a shift of 10 nm (0.09 eV) was measured.…”

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confidence: 94%

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Elaboration and study of structural and optical properties of AuBr nanocrystalsdispersed in KBr single crystals

Zaioune¹,

Zehani²,

Boutaoui³

et al. 2019

Turk J Phys

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The structural and optical properties of the AuBr nanocrystals embedded in the KBr single crystals grown by the Czochralski method were studied using several techniques. The X-ray diffraction reveals their formation and incorporation. The crystallite average radii calculated from XRD using the Scherrer's formula was found to vary between 19 and 39 nm. The photoluminescence spectra obtained on these same samples present an emission band located at 1.91 eV (650 nm), which can be attributed to the orange luminescence of AuBr nanocrystals. However, the photoluminescence excitation measurements of these nanocrystals exhibit an excitation band located at 3.44 eV (360 nm), slightly shifted towards higher energies in comparison with the massive crystal.

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