RGB Light Emissions from ZnSe Based Nanocrystals: ZnSe, ZnSe:Cu, and ZnSe:Mn

Song, Byung-Kwan; Heo, Jeong-Ho; Hwang, Cheong Soo

doi:10.5012/bkcs.2014.35.12.3601

Cited by 6 publications

(2 citation statements)

References 33 publications

(40 reference statements)

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“…In view of the above points (especially the much larger RSS of Cal. a ), the impurity Cu 2+ is more likely to occupy the TCT substitutional Cd 2+ site in the CdS films and the previous assignment of Cu 2+ [36]. Meanwhile, the stronger compression of the ligand tetrahedra can induce stronger Cu 2+ 3d-3s (or 4s) orbital admixtures (i.e., the stronger Fermi contact interactions) and hence the larger core polarization constants κ.…”

Section: Discussionmentioning

confidence: 78%

Studies of impurity occupation and local angular distortions for Cu²⁺in CdS films at different concentrations

Zhang

et al. 2016

Phys. Scr.

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In order to clarify impurity occupation and local structures for Cu 2+ in the CdS films, the g factors and hyperfine structure constants (HSCs) and their concentration dependences are theoretically studied from the perturbation calculations for both the cases of tetragonally compressed tetrahedral (TCT) and tetragonally elongated octahedral (TEO) 3d 9 clusters. Despite similar g anisotropies g // >g ⊥ >2, the calculated g factors and HSCs and their concentration dependences based on the TCT [CuS 4 ] 6− cluster show much better agreement with the experimental data than those based on the previously assigned TEO [CuS 6 ] 10− cluster. So, the g factors and HSCs can be ascribed to the substitutional TCT [CuS 4 ] 6− cluster on Cd 2+ site, and the possibility of the previous assignment of interstitial TEO [CuS 6 ] 10− cluster may be tentatively excluded. In the TCT [CuS 4 ] 6− clusters, the local Cu 2+ -S 2− bond angles θ related to C 4 axis are found to be about 1.54°larger than the ideal value θ 0 (≈54.736°) of a regular tetrahedron owing to the Jahn-Teller effect. The magnitudes of g factors and HSCs demonstrate the overall increasing trends with increasing Cu 2+ concentration, attributable to the decrease of covalency (increase of covalency factor N) and the increases of the angular deviation Δθ (=θ-θ 0 ) and the core polarization constant κ.

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Section: Discussionmentioning

confidence: 78%

Studies of impurity occupation and local angular distortions for Cu²⁺in CdS films at different concentrations

Zhang

et al. 2016

Phys. Scr.

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“…As shown in Figure 12, the green Cu emission arises from the recombination between the ZnO donor electronic states to holes trapped T 2 electronic state of Cu 2+ ions. [73]…”

Section: Sem and Edx Studiesmentioning

confidence: 99%

Rapid, controllable, one‐pot and room‐temperature aqueous synthesis of ZnO:Cu nanoparticles by pulsed UV laser and its application for photocatalytic degradation of methyl orange

et al. 2017

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Zinc oxide (ZnO) and ZnO:Cu nanoparticles (NPs) were synthesized using a rapid, controllable, one-pot and room-temperature pulsed UV-laser assisted method. UV-laser irradiation was used as an effective energy source in order to gain better control over the NPs size and morphology in aqueous media. Parameters effective in laser assisted synthesis of NPs such as irradiation time and laser shot repetition rate were optimized. Photoluminescence (PL) spectra of ZnO NPs showed a broad emission with two trap state peaks located at 442 and 485 nm related to electronic transition from zinc interstitial level (I ) to zinc vacancy level (V ) and electronic transition from conduction band to the oxygen vacancy level (V ), respectively. For ZnO:Cu NPs, trap state emissions disappeared completely and a copper (Cu)-related emission appeared. PL intensity of Cu-related emission increased with the increase in concentration of Cu , so that for molar ratio of Cu:Zn 2%, optimal value of PL intensity was obtained. The photocatalytic activity of Cu-doped ZnO revealed 50 and 100% increasement than that of undoped NPs under UV and visible irradiation, respectively. The enhanced photocatalytic activity could be attributed to smaller crystal size, as well as creation of impurity acceptor levels (T ) inside the ZnO energy band gap.

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One-step controlled synthesis of ZnO-ZnSe hollow nanospheres with surface defects for selective detection of NO2

Gao

Zhang

et al. 2023

Applied Surface Science

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RGB Light Emissions from ZnSe Based Nanocrystals: ZnSe, ZnSe:Cu, and ZnSe:Mn

Cited by 6 publications

References 33 publications

Studies of impurity occupation and local angular distortions for Cu²⁺in CdS films at different concentrations

Studies of impurity occupation and local angular distortions for Cu²⁺in CdS films at different concentrations

Rapid, controllable, one‐pot and room‐temperature aqueous synthesis of ZnO:Cu nanoparticles by pulsed UV laser and its application for photocatalytic degradation of methyl orange

One-step controlled synthesis of ZnO-ZnSe hollow nanospheres with surface defects for selective detection of NO2

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RGB Light Emissions from ZnSe Based Nanocrystals: ZnSe, ZnSe:Cu, and ZnSe:Mn

Cited by 6 publications

References 33 publications

Studies of impurity occupation and local angular distortions for Cu2+in CdS films at different concentrations

Studies of impurity occupation and local angular distortions for Cu2+in CdS films at different concentrations

Rapid, controllable, one‐pot and room‐temperature aqueous synthesis of ZnO:Cu nanoparticles by pulsed UV laser and its application for photocatalytic degradation of methyl orange

One-step controlled synthesis of ZnO-ZnSe hollow nanospheres with surface defects for selective detection of NO2

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Studies of impurity occupation and local angular distortions for Cu²⁺in CdS films at different concentrations

Studies of impurity occupation and local angular distortions for Cu²⁺in CdS films at different concentrations