Luminescence of double quantum wells subject to in-plane magnetic fields

Орлита, М.; Grill, R.; Hlı́dek, P.; Zvára, M.; Döhler, G. H.; Malzer, S.; Byszewski, M.

doi:10.1103/physrevb.72.165314

Cited by 14 publications

(10 citation statements)

References 20 publications

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“…Copyright 1983, Elsevier B.V. b) Normalized PL spectra of DQW at a constant bias of U pn = +1.8 V, in the in‐plane magnetic field ( B  ). Reproduced with permission . Copyright 2005, The American Physical Society.…”

Section: Nanostructured Semiconductorsmentioning

confidence: 99%

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Bai

Tsang

Hao

2014

Advanced Optical Materials

134

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thermoluminescence (TL), and so on. [ 2 ] Nowadays, a large number of phosphors have been synthesized and developed, each one having its own characteristic emission wavelength, bandwidth, and luminescence lifetime. Here, the lifetime normally means the time in which the emission intensity decays to 1/ e . Moreover, phosphors have been extensively utilized in many areas, both scientifi c research and practical applications. For instance, phosphor-converted fl uorescent lamps and white light-emitting devices (LEDs) have been used as light sources in a widespread range of daily life and industrial applications. [ 3 ] CL and EL phosphors have been applied to traditional or modern display devices presenting visual information. [ 4 ] In the past few decades, fl uorescent nanoparticles, such as quantum dots (QDs) [ 5 ] and lanthanide (Ln) ion-doped nanocrystals, [ 6 ] have attracted considerable attention and showed great promise in fl uorescent probes, biosensing, bioimaging, therapies, and optoelectronic devices. [ 7 ] The ability to tune the luminescence properties of phosphors is highly desired in the optical materials community. [ 8 ] For various applications such as solid-state lasers, bioimaging, optical sensing, and display devices, precise control over the luminescence properties is essential for optimizing the performance and processing of optical devices and systems. Tuning luminescence is also of great signifi cance for fundamental studies of the luminescence mechanisms of phosphors. In general, tuning luminescence in the visible region is popularly known as varying the emission colour and brightness obtained by the naked eye. Broadly speaking, tuning luminescence changes the emission intensity, wavelength, bandwidth, luminescence decay or lifetime, and polarization.Numerous studies have extensively focused on tuning the luminescence of phosphors by conventional chemical ways, typically changing chemical compositions, crystal structure, phase, nanocrystal size, surface groups, and so on. [ 9 ] Comparatively, there have been less results that show the tunable luminescence of phosphors through physical methods. So far, few attempts have been made to provide a comprehensive coverage of the strategies pertaining to this emerging research fi eld and a broad overview of research advances in diverse areas of application. In this review, chemically driven luminescence tuning is Tuning the luminescence of phosphors is extremely important in controlling and processing light for active components of light sources, optical sensing, display devices, and biomedicine. So far, conventional chemical approaches have routinely been employed to modify the luminescence during the phosphor's synthesis. It is interesting to broaden the modulation of luminescence by physical methods, such as electric fi eld, magnetic fi eld, mechanical stress, temperature, photons, ionizing radiation, and so on. Since some physical methods may provide unusual routes to tune the luminescence in in-situ, real-time, dynamical and reversible mann...

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Section: Nanostructured Semiconductorsmentioning

confidence: 99%

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Bai

Tsang

Hao

2014

Advanced Optical Materials

134

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“…The possibility to generate direct and indirect excitonic states in double quantum wells focused great attention in optical experiments [10,11,12]. Furthermore, the g-factor variation with an external electric field has been observed in coupled quantum wells with unequal widths [13].…”

Section: Introductionmentioning

confidence: 99%

Tuning of the Landé g-factor in Al_xGa_1−xAs/AlAs single and double quantum wells

Hernández

Gusev

Bakarov

2013

J. Phys.: Conf. Ser.

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Abstract. We report on the spin dynamics of a high mobility two-dimensional electron gas in a AlxGa1−xAs/AlAs double quantum well structure. For high electron density samples, the gfactor was measured using time-resolved Kerr rotation technique. The g-factor tuning capability was observed by changing the aluminum content x independently in each well. Experiments demonstrated an unusual spin dephasing time robustness for high excitation power. The effect of the interaction between wells was analyzed in samples with different tunneling barriers. Results were compared with experiments on single well systems demonstrating higher spin polarization generation, longer spin dephasing time, and coupling for the double structures.

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“…Polarization resolved PL measurements provide with energy, spin and space distribution of electrons. A probe of the electron distribution is of particular interest because it may throw some light on a development of the charge-density-wave (CDW) in quantum Hall bilayers.In DQW systems PL was used to study a structure of energy levels and excitonic states [15][16][17][18][19]. To the best of our knowledge polarized PL was not yet employed.…”

mentioning

confidence: 99%

“…In DQW systems PL was used to study a structure of energy levels and excitonic states [15][16][17][18][19]. To the best of our knowledge polarized PL was not yet employed.…”

mentioning

confidence: 99%

Circularly Polarized Photoluminescence as a Probe of Density of States inGaAs/AlGaAsQuantum Hall Bilayers

et al. 2012

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Polarized magneto-photoluminescence is employed to study the energies and occupancies of four lowest Landau levels in coupled quantum Hall GaAs/AlGaAs double quantum well. As a result, the magnetic field induced redistribution of charge over the Landau levels manifesting to the continuous formation of the charge density wave and the direct evidence for the symmetric-antisymmetric gap shrinkage at ν = 3 are found. The observed inter-level charge exchange causes depolarization of the ferromagnetic ground state. Owing to the quantization of the in-plane kinetic energy, the effects of electron-electron interaction may be managed by a strong perpendicular magnetic field in twodimensional electron gas. Further control of the interaction is provided by means of spin, subband or layer degrees of freedom in multi-component electron system. A simplest realization of a multiply layer system is a bilayer system. A possibility controlling the competition between intrawell and interwell electron-electron correlations by layer degree of freedom associated with the third dimension in quantum Hall bilayers causes rich variety of quantum phases predicted at odd filling factors in Refs. [1][2][3][4]. Some of them were observed in magnetotransport experiments in Refs. [5][6][7][8][9]. Moreover, depending on interlayer tunneling and layer separation a ferromagnetic, a symmetric spin-singlet and an antiferromagnetic canted phases were found at total even filling factor ν = 2 [10,11]. Recently, formation of not uniform charge distribution in quantum Hall bilayers at partially populated filling factors was discussed in Refs. [4,12,13].A bilayer electron system may be realized in double quantum well (DQW) semiconductor heterostructures, which consist of two closely spaced two-dimensional electron sheets separated by an insulating barrier. The interlayer coupling hybridizes the individual quantum well states into symmetric (S) and antisymmetric (AS) components, which are split by an energy ∆ SAS . This splitting results in different emission energies from S and AS states, which can be independently explored by spectroscopic methods. Thus, in contrast to magnetotransport measurements, where an average response of occupied electron states is usually examined, photoluminescence (PL) may probe individual contributions of each state . Polarization resolved PL measurements provide with energy, spin and space distribution of electrons. A probe of the electron distribution is of particular interest because it may throw some light on a development of the charge-density-wave (CDW) in quantum Hall bilayers.In DQW systems PL was used to study a structure of energy levels and excitonic states [15][16][17][18][19]. To the best of our knowledge polarized PL was not yet employed.We focalized on examination of spin polarization and occupancy of individual electron states formed in the GaAs/AlGaAs/GaAs bilayer system in quantizing magnetic field in vicinity of the filling factors ν = 2, 3. In strong magnetic field, when the cyclotron energy dominates, the...

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Luminescence of double quantum wells subject to in-plane magnetic fields

Cited by 14 publications

References 20 publications

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Tuning of the Landé g-factor in Al_xGa_1−xAs/AlAs single and double quantum wells

Circularly Polarized Photoluminescence as a Probe of Density of States inGaAs/AlGaAsQuantum Hall Bilayers

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Luminescence of double quantum wells subject to in-plane magnetic fields

Cited by 14 publications

References 20 publications

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Tuning the Luminescence of Phosphors: Beyond Conventional Chemical Method

Tuning of the Landé g-factor in AlxGa1−xAs/AlAs single and double quantum wells

Circularly Polarized Photoluminescence as a Probe of Density of States inGaAs/AlGaAsQuantum Hall Bilayers

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Product

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Tuning of the Landé g-factor in Al_xGa_1−xAs/AlAs single and double quantum wells