Centers of radiative and nonradiative recombination in isoelectronically doped ZnSe : Te crystals

Baltramiejūnas, R.; Ryzhikov, V. D.; Račiukaitis, Gediminas; Gavryushin, V.; Juodžbalis, D.; Kazlauskas, A.

doi:10.1016/0921-4526(93)90245-2

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…Here, the PL-intensity variation at 585 nm versus the irradiation time was used to assess the photocatalytic degradation efficiency because it is related to the relative concentration of the RhB solution [34]. For t m = 0-30 nm, only one peak in E2 region is observed at about 520-550 nm (2.38-2.25 eV), which is ascribed to V Se [31], V Zn , and/or Zn i defects [10,32]. The E2 band can be deconvoluted into two components for samples t m = 40 and 60 min, as shown in the inset of Figure 6a.…”

Section: Resultsmentioning

confidence: 99%

Structural, Optical, and Photocatalytic Properties of ZnSe Nanoparticles Influenced by the Milling Time

Hiền

Thanh

Thúy³

et al. 2021

Crystals

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ZnSe nanoparticles (NPs) were prepared by combining both hydrothermal and mechanical milling methods. Transmission electron microscopy images show that fabricated ZnSe NPs with a sphere-like shape have an average size (d) in the range of 20–100 nm, affected by changing the milling time from 10 to 60 min. All the samples crystalize in zincblende-type structure without impurities, as confirmed by analyzing X-ray diffraction patterns, Raman spectra, and energy-dispersive X-ray spectroscopy. Carefully checking Raman spectra, we have observed the broadening and redshift of vibration modes as decreasing NP size, which are ascribed to extra appearance of disorder and defects. The photoluminescence study has found a blue emission at 462 nm attributed to the excitonic near-band edge and a broad defect-related emission around 520–555 nm. Increasing milling time leads to the decrease in the exciton-emission intensity, while the defect-related emissions increase gradually. Interestingly, as decreasing d, we have observed an improved photodegradation of Rhodamine B under UV irradiation, proving application potentials of ZnSe NPs in photocatalytic activity.

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Section: Resultsmentioning

confidence: 99%

Structural, Optical, and Photocatalytic Properties of ZnSe Nanoparticles Influenced by the Milling Time

Hiền

Thanh

Thúy³

et al. 2021

Crystals

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“…The "deep level saturation spectroscopy" (DLSS), based on incoherent nonequilibrium processes of impurity absorption, optically modulated up to saturation [11][12][13][14][15][22][23][24][25][26], allows to separate the spectral contributions from deep centers of different nature, even in the case when they are (vii) Special selectivity to the type of primary carrier capture by the centers, from the spectral form of γ-DLSS components. Induced response to the carrier capture from a near or distant band, relative to DL level, are different by sign, so the measured spectra are inverted [22].…”

Section: Resultsmentioning

confidence: 99%

“…The problem of identification of the defects nature [13][14][15][16][17][18][19][20][21][22][23][24][25] is solved, as usual, from the general principles of technological changes of their content. Let's show one more aspect of DLSS, an opportunity to connect directly the experimental data with participation of the centers in radiative recombination and to define the luminescence band caused by concrete DL's.…”

Section: Correlation Between Dlss and Luminescence Dynamics: Identifimentioning

confidence: 99%

“…The transient DLSS method was used successfully in studying the properties of DLs in ZnTe [12], ZnSe [11,25], CdS [29], ZnO [30], and ZnS [18,19] wide-bandgap crystals. Due to its realization specific, such as necessity to use a thick enough samples (1-10 mm), only deep enough local defects (with binding energies > 100 meV) may be evident and characterised by DLSS.…”

Section: Introductionmentioning

confidence: 99%

“…During the two-step absorption (TSA) of probe quanta from transparency area (Dω < E g ) of media, there is a consecutive excitation of electrons from a valence band to conduction band through the deep local states in the forbidden gap. This can be classified as quasistationary TSA (v → D → c) for the probe light beam with long enough illumination (Δt > τ, τ-lifetime of localized carriers) and nonequilibrium TSA (Δt L < τ) for the mixed "probe + laser" two-step transitions v → D → c. At the combination of long probe and short laser light pulses (Figure 2), so-called, laser modulation of TSA (LM TSA) takes place [11,14,[22][23][24][25][26], which possesses the necessary spectroscopic opportunities.…”

Section: Introductionmentioning

confidence: 99%

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Deep Level Saturation Spectroscopy

Gavryushin

2012

International Journal of Optics

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We review the "Deep Level Saturation Spectroscopy" (DLSS) as the nonlinear method to study the deep local defects in semiconductors. The essence of a method is determined by the processes of sufficiently strong laser modulation (up to saturation) of quasistationar two-step absorption of the probe light via deep levels (DLs). DLSS is based on nonequilibrium processes of the optically induced population changes for deep levels which lead to the changes in an impurity absorption. This method allows us the separation of the spectral contributions from different deep centers (even in the case of their full spectral overlap), on the basis of the difference of their optical activity (photon capture cross-sections) and of their electroactivity difference (carriers capture coefficients). As shown, DLSS is allowed to determine directly the main set of phenomenological parameters (cross-sections, concentration, bound energy, etc.) for deep local defects, their content and energy position in the band gap. Some important aspects of DLSS were shown also: the possibility to connect directly the measured data to the local centers which are participating in radiative recombination, and also the possibility to study directly the phonon relaxation processes in the localized states of deep defects.

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Three‐Dimensional Cuprous Lead Bromide Framework with Highly Efficient and Stable Blue Photoluminescence Emission

et al. 2020

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Considering the instability and low photoluminescence quantum yield (PLQY) of blue‐emitting perovskites, it is still challenging and attractive to construct single crystalline hybrid lead halides with highly stable and efficient blue light emission. Herein, by rationally introducing d10 transition metal into single lead halide as new structural building unit and optical emitting center, we prepared a bimetallic halide of [(NH4)2]CuPbBr5 with new type of three‐dimensional (3D) anionic framework. [(NH4)2]CuPbBr5 exhibits strong band‐edge blue emission (441 nm) with a high PLQY of 32 % upon excitation with UV light. Detailed photophysical studies indicate [(NH4)2]CuPbBr5 also displays broadband red light emissions derived from self‐trapped states. Furthermore, the 3D framework features high structural and optical stabilities at extreme environments during at least three years. To our best knowledge, this work represents the first 3D non‐perovskite bimetallic halide with highly efficient and stable blue light emission.

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Centers of radiative and nonradiative recombination in isoelectronically doped ZnSe : Te crystals

Cited by 12 publications

References 9 publications

Structural, Optical, and Photocatalytic Properties of ZnSe Nanoparticles Influenced by the Milling Time

Structural, Optical, and Photocatalytic Properties of ZnSe Nanoparticles Influenced by the Milling Time

Deep Level Saturation Spectroscopy

Three‐Dimensional Cuprous Lead Bromide Framework with Highly Efficient and Stable Blue Photoluminescence Emission

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