Bright White‐Light Emission from Semiconductor Nanocrystals: by Chance and by Design

Sapra, Sameer; Mayilo, Sergiy; Klar, Thomas A.; Rogach, Andrey L.; Feldmann, Jochen

doi:10.1002/adma.200602267

Cited by 247 publications

(219 citation statements)

References 14 publications

Supporting

Mentioning

213

Contrasting

Order By: Relevance

“…The energies of the states with m  0 become higher under the influence of the magnetic field. For the states with m < 0, the nonmonotonous dependence of the energy on magnetic field is caused by the linear and quadratic terms contributed by the magnetic field in the Hamiltonian (11). When the magnetic field increases, the states with m = ... , 2 , 1 , 0   successively play the role of the ground state.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

“…Multilayered spherical quantum dots awake a particular interest of researchers because these structures can be implemented for production of light emitting diodes as they give high-efficient luminescence [11][12][13]. The simplest multilayered spherical structures are quantum dots composed of the semiconductor core and shell embedded into the matrix [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effect of magnetic and electric fields on optical properties of semiconductor spherical layer

Holovatsky¹,

Bernik²

2014

Semicond. Phys. Quantum Electron. Optoelectron.

View full text Add to dashboard Cite

Abstract. Theoretical investigation of the influence of magnetic and electric fields on the energy spectrum and wave functions of electron in semiconductor spherical layer has been performed. The case of co-directed electric and magnetic fields has been considered. The Schrödinger equation has been solved using the method of expansion for the wave function of electron in the spherical layer under external fields by applying the complete set of wave functions of a quasi-particle in a spherical nanostructure without the external fields. It has been shown that electric and magnetic fields take off the spectrum degeneration with respect to the magnetic quantum number. The external fields rebuild the energy spectrum and deform wave functions of electron. Moreover, their influence on the spherically symmetric state is the largest one. Increasing the magnetic field induction entails a monotonous dependence of the electron energy for the states with m  0 and non-monotonous one for the states with m < 0. The ground state of electron is successively formed by the states with m = 0, -1, -2, … with increasing the induction of magnetic field. The enhancement of the electric field mainly diminishes the electron energy. The influence of field on the energy and intensities of the 1p-1s intraband transition has been studied. It has been shown that there exists a certain value of the electric field, at which the energy of quantum transition doesn't depend on the magnetic field induction.

show abstract

Section: Analysis Of the Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of magnetic and electric fields on optical properties of semiconductor spherical layer

Holovatsky¹,

Bernik²

2014

Semicond. Phys. Quantum Electron. Optoelectron.

View full text Add to dashboard Cite

show abstract

“…[23,24] The Mn 2C ion emission is in the orange region, while that of the surface defect states is in the blue and green emission regions. There are also other reports on generation of white light emission from QDs like magic-sized QDs, [25] core/shell [26,27] and alloy QDs. [27,28] However, all the abovementioned systems depend upon surface-state emission from the QDs, which is not only difficult to control, but also not easy to reproduce.…”

Section: Introductionmentioning

confidence: 99%

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

Rajesh

Phadnis

Sonawane

et al. 2014

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

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.

show abstract

“…8,9 For application, Sapra et al have investigated white light generation using these QDQW emitters of cyan and red in toluene solution. 10 However, the resulting color rendering was low and QDQWs were not integrated into a solid-state device. Nizamoglu et al have then hybridized such dual-color emitting CdSe/ZnS/CdSe QDQWs on InGaN/GaN light emitting diodes for high-quality white light generation.…”

Section: Introductionmentioning

confidence: 99%

Reordering orbitals of semiconductor multi-shell quantum dot-quantum well heteronanocrystals

Şahin

Nizamoğlu

Yerli

et al. 2012

Journal of Applied Physics

View full text Add to dashboard Cite

Based on self-consistent computational modeling of quantum dot-quantum well (QDQW) heteronanocrystals, we propose and demonstrate that conduction-electron and valence-hole orbitals can be reordered by controlling shell thicknesses, unlike widely known core/shell quantum dots (QDs). Multi-shell nanocrystals of CdSe/ZnS/CdSe, which exhibit an electronic structure of 1s-1p-2s-2p-1d-1f for electrons and 1s-1p-2s-2p-1d-2d for holes using thin ZnS and CdSe shells (each with two monolayers), lead to 1s-2s-1p-1d-1f-2p electron-orbitals and 1s-2s-1p-1d-2p-1f hole orbitals upon increasing the shell thicknesses while keeping the same core. This is characteristically different from the only CdSe core and CdSe/ZnS core/shell QDs, both exhibiting only 1s-1p-1d-2s-1f-2p ordering for electrons and holes. © 2012 American Institute of Physics

show abstract

Bright White‐Light Emission from Semiconductor Nanocrystals: by Chance and by Design

Cited by 247 publications

References 14 publications

Effect of magnetic and electric fields on optical properties of semiconductor spherical layer

Effect of magnetic and electric fields on optical properties of semiconductor spherical layer

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

Reordering orbitals of semiconductor multi-shell quantum dot-quantum well heteronanocrystals

Contact Info

Product

Resources

About