Optical characterization of native defects in ZnSe substrate

Yoshino, Kenji; Mikami, Hidenori; Imai, Kenji; Yoneta, Minoru; Ikari, Tetsuo

doi:10.1016/s0921-4526(01)00444-6

Cited by 12 publications

(8 citation statements)

References 33 publications

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“…Moreover, a similar broad band emission (excited within almost the same energy range) was already reported for pure Co−Al-LDHs . Although the nature of this emission remains unclear, we speculate that the band is due to Al-related defects. , …”

Section: Resultssupporting

confidence: 83%

“…54 Although the nature of this emission remains unclear, we speculate that the band is due to Al-related defects. 55,56 The emission spectra of the Eu 3þ /Nd 3þ codoped LDHs display intra-4f 3 self-absorptions (most evident for the material with higher Nd 3þ content, Eu2Nd4) assigned to the 4 I 9/2 f 2 K 15/2 , 2 G 7/2 transitions. Such self-absorptions indicate the presence of radiative energy transfer, namely, part of the emitted visible light is absorbed by the Nd 3þ cations, and subsequently converted into NIR emission, as discussed below.…”

Section: ' Results and Discussionmentioning

confidence: 99%

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Multiwavelength Luminescence in Lanthanide-Doped Hydrocalumite and Mayenite

et al. 2011

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Lanthanide (Eu and Nd)-doped hydrocalumite has been prepared by a coprecipitation method. All samples, with Eu 3þ and Nd 3þ contents up to 4% (molar ratio), show a single crystallographic phase, without segregation of secondary lanthanide-containing phases. Calcination affords lime and mayenite, with lanthanide cations embedded in the structure. The photoluminescence spectra of the noncalcined samples consist of Eu 3þ (in the visible region) and Nd 3þ (in the NIR) intra-4f transitions and a broad band ascribed to Al-related defects. The Eu 3þ5 D 0 lifetime values and quantum efficiency of the Eu 3þ /Nd 3þ codoped hydrocalumite decrease ca. 10%, relative to the single doped material, suggesting that the Nd 3þ incorporation activates nonradiative channels for the 5 D 0 depopulation. High-temperature stable ceramic pigments, prepared from Eu 3þ and Nd 3þ doped hydrocalumite precursors, afford multiwavelength luminescent materials emitting in a large vis/NIR spectral region, with potential applications as barcodes and in broadband amplifiers. The emission spectra of the calcined samples give unequivocal evidence for the presence of two Eu 3þ local environments, attributed to Eu 3þ sites in CaO and mayenite. Upon calcination, the absolute emission quantum yield of the Eu 3þ -doped sample increases from less than 0.01 to 0.06.

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Section: Resultssupporting

confidence: 83%

Section: ' Results and Discussionmentioning

confidence: 99%

Multiwavelength Luminescence in Lanthanide-Doped Hydrocalumite and Mayenite

et al. 2011

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“…As discussed, the reason for this is crystal lattice defects. As a rule, ZnSe is characterized by a large number of intrinsic point defects with the predominating vacancies of Zn and Se as well as interstitial atoms [42,43]. Moreover, a high doping level leads to the emergence of dislocations, additional intrinsic defects and a change in the chemical composition due to the isovalent Se and Te elements.…”

Section: Empirical Data and Discussionmentioning

confidence: 99%

Nanostructures on the ZnSe Surface: Synthesis, Morphological and Photoluminescent Properties

Suchikova

Lazarenko

Ковачов

et al. 2021

Phys. Chem. Solid St.

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Nanostructured zinc selenide has been obtained by electrochemical etching with an H2SO4:H2O:H2O5OH=4:1:1 solution used as the electrolyte. The experiment has indicated that the surface consists of two phases, namely the upper layer made up of a dense oxide film and a low-sized porous layer underneath, with a pore diameter of (30-80) nm and a thickness of interporous walls of (15-50) nm. The investigated dependence of surface porosity on the etching time allows us to explain the main stages of the crystal’s electrochemical dissolution during anodizing. The experiment has indicated the presence of three main stages, such as the formation of the Gouy and Helmholtz layers at the semiconductor/electrolyte segregation; pore formation at defect and oxide crystallite locations; spontaneous pore formation. The PL spectra of the samples under study have demonstrated three maxima. The emission band at 2.45 eV is attributable to the presence of oxides, the band at 2.78 EV can be accounted for the corresponding excitons while the band at 2.82 eV stems from quantum-dimensional effects. Chemical analysis of the samples has also indicated the presence of oxides on the surface of the nanostructure.

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“…With the present method of surface treatment for ZnSe samples, described in the paper, it is still below 1. The thickness of the surface layer determined from the piezoelectric photothermal amplitude spectra for Zn 1−x Be x Se type mixed crystals is about two times smaller than for ZnSe and is equal to about 70 µm for x = 0.05 [11,[14][15][16] for the same surface treatment. This agrees with the 1.6 times increase of the microhardness of Zn 1−x Be x Se crystal, from 1 GPa to 1.6 GPa, with an increase of parameter x from x = 0 to x = 0.05 [17].…”

Section: Thickness CMmentioning

confidence: 90%

Influence of the Surface Mechanical Treatment on the Photothermal Piezoelectric Spectra of ZnSe Crystals

Zakrzewski¹,

Maliński

Strzałkowski³

2012

Int J Thermophys

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This paper presents experimental and theoretical piezoelectric photoacoustic spectra of ZnSe samples after different surface treatments: grinding, polishing, and etching. The modification of the Jackson and Amer theory, presented in the paper, enabled numerical interpretation of the spectra in the model of a mechanically damaged surface layer. The nature of the characteristic peak observed at E = 2.65 eV below the energy gap is explained as caused by the Urbach absorption tail and the damaged surface layer of a sample. The correlation between the microhardness of the Zn 1−x Be x Se and ZnSe crystals and the thickness of the mechanically damaged surface layer was observed.

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Optical characterization of native defects in ZnSe substrate

Cited by 12 publications

References 33 publications

Multiwavelength Luminescence in Lanthanide-Doped Hydrocalumite and Mayenite

Multiwavelength Luminescence in Lanthanide-Doped Hydrocalumite and Mayenite

Nanostructures on the ZnSe Surface: Synthesis, Morphological and Photoluminescent Properties

Influence of the Surface Mechanical Treatment on the Photothermal Piezoelectric Spectra of ZnSe Crystals

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