Exciton recombination dynamics in zinc selenide quantum dots

Rajesh, Ch.; Lad, Amit D.; Ghangrekar, Ajit; Mahamuni, Shailaja

doi:10.1016/j.ssc.2008.09.022

Cited by 14 publications

(6 citation statements)

References 41 publications

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“…Thus by tuning both the size as well as the concentration variation, the emission of Cu:ZnSe QDs can be tuned. A decrease in the Stokes shift (a difference between optical absorption and the luminescence position) is also observed here in comparison with the undoped case [37]. This is a clear indication that Cu:ZnSe QDs do not show defect or trap luminescence compared to the undoped ZnSe QDs.…”

Section: Resultssupporting

confidence: 76%

Tuning of emission from copper-doped ZnSe quantum dots

Kumar

Prasad

Kumar³

et al. 2019

Phys. Scr.

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In this paper, different concentrations of copper-doped zinc selenide quantum dots (Cu:ZnSe QDs) were synthesized and compared with differently sized (2.0-3.7 nm) Cu:ZnSe QDs by keeping the concentration of Cu fixed at 5%. In both cases a high-temperature wet chemical route was employed for synthesis. As the concentration of Cu increased from 2.5% to 12.5% in the solution, a clear redshift was observed in the absorption spectrum, which is an indication that Cu ions have been incorporated into the host lattice. In order to identify the state in which the Cu ions are present, electron paramagnetic resonance (EPR) studies were carried out on the samples. The EPR spectra reveal a resonance signal which is characteristic of Cu 2+ ions. With an increase in concentration of Cu ions it is found that the ĝ component increases. Photoluminescence emission and excitation studies revealed both band-edge and Cu-related emission, further strengthening the incorporation of Cu ions in the host lattice.

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Section: Resultssupporting

confidence: 76%

Tuning of emission from copper-doped ZnSe quantum dots

Kumar

Prasad

Kumar³

et al. 2019

Phys. Scr.

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“…The lifetime of band-edge emission for undoped ZnSe QDs was found to be 4.5 ns, and is in good agreement with the earlier work. [37] Upon doping Cu in ZnSe QDs, band-edge emission is quenched leading to slight faster decay (3.7 ns). Energy transfer to dopant ion causes reduction in lifetime (1/T PL increases as 1/T CT increases).…”

Section: Resultsmentioning

confidence: 99%

Generation of white light from co-doped (Cu and Mn) ZnSe QDs

Rajesh

Phadnis

Sonawane

et al. 2014

Journal of Experimental Nanoscience

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White light generation is achieved by single-step co-doping of copper and manganese into the robust ZnSe quantum dots (QDs) which were synthesised using a wet chemical route. Photoluminescence (PL) emission spectra revealed three peaks related to blue (ZnSe), green (copper related) and orange (manganese related). The PL spectra indicated no surface and/or trap state related emission. Photoluminescence excitation (PLE) measurements confirmed co-doping of copper and manganese in the same QD. PLE spectra recorded with emission wavelength fixed at copper and manganese showed a band edge at the same position, indicating the incorporation of both copper and manganese in the same QD. Time-resolved PL measurements suggest an atomic like nature of Mn and Cu in ZnSe QDs.

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“…The longer decay times (τ 2 ) are interpreted as the intrinsic transition of the QDs or "excitonic transition". 19 The shorter decay times (τ 1 ) could be partial quenching of the exciton luminescence by surface and lattice defects such as unsaturated surface bonds of Zn or Se, and/or Se vacancies inside the QD, providing additional decay channel. 17,18 The decay curve of the dense solution shows a slower decrease in normalized emission intensity than that of the dilute QDs' solution.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of ZnSe Quantum Dots Using a Continuous-Flow Microreactor and Their White Emission through Energy Transfer

Kwon

Kim

et al. 2013

ECS Solid State Letters

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We report a continuous-flow microreaction synthesis of ZnSe quantum dots (QDs) which are controllable in their emission from blue to white light. The emission of ZnSe QDs exhibits quantum confinement effect, which is adjusted by the flow rate of precursor solution. The ZnSe QDs' high concentration solution shows red-shifted emission in the blue region and strongly enhanced greenyellow emission from deep levels due to the inter-QD energy transfer, thereby exhibiting white color with CIE color coordinates of (0.33, 0.33). The red-shifted band-edge emission with longer decay time in the dense solution confirms that the energy is transferred efficiently between QDs.

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Exciton recombination dynamics in zinc selenide quantum dots

Cited by 14 publications

References 41 publications

Tuning of emission from copper-doped ZnSe quantum dots

Tuning of emission from copper-doped ZnSe quantum dots

Generation of white light from co-doped (Cu and Mn) ZnSe QDs

Synthesis of ZnSe Quantum Dots Using a Continuous-Flow Microreactor and Their White Emission through Energy Transfer

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