Collective resonance and form factor of homogeneous broadening in semiconductors

Zaitsev, S. I.; Gordeev, N. Yu.; Karachinsky, L. Ya.; Kopchatov, V. I.; Novikov, I. I.; Tarasov, I. S.; Pikhtin, N. A.; Ustinov, V. I.; Kop’ev, P. S.

doi:10.1063/1.126393

Cited by 11 publications

(7 citation statements)

References 7 publications

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“…The physical justification of this empirical function, based on a super-radiance model, is given in Ref. 16. Figure 2 displays the spontaneous spectrum measured on a reference LED ͑which has nominally the same active region as the MCLED͒ at a current density of 36 A/cm 2 .…”

Section: Determination Of the Extraction Efficiencymentioning

confidence: 99%

Experimental determination of the internal quantum efficiency of AlGaInP microcavity light-emitting diodes

Royo

Stanley

Ilegems

et al. 2002

Journal of Applied Physics

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Detailed study of external quantum efficiency ηQE is reported for AlGaInP-based microcavity light-emitting diodes (MCLEDs). Unlike conventional light-emitting diodes (LEDs) the extraction efficiency γext and far field profile depend on the linewidth of the intrinsic spontaneous emission and wavelength detuning between cavity mode and peak electroluminescence. This dependence makes it difficult to estimate the intrinsic spectrum, hence the performances of MCLEDs. By using a nondestructive deconvolution technique, the intrinsic spectra of a MCLED and a reference LED (with the same active regions) could be determined at different current densities. This allowed precise calculation of γext for both devices (values close to 11% were found for the MCLED), and hence of their apparent internal quantum efficiencies ηintapp. At 55 A/cm2, values of 90% and 40% were determined for the LED and MCLED, respectively. In order to explain this difference, we measured ηQE for devices with different sizes. From a fitting procedure based on a simple model taking into account the device size, we found that the radiative efficiencies of LEDs and MCLEDs were close to 90%. We concluded that the low ηintapp of MCLED was due to a bad current injection, and especially to electron leakage current, as confirmed by numerical simulations.

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Section: Determination Of the Extraction Efficiencymentioning

confidence: 99%

Experimental determination of the internal quantum efficiency of AlGaInP microcavity light-emitting diodes

Royo

Stanley

Ilegems

et al. 2002

Journal of Applied Physics

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“…In agreement with Eq. ( 3), SR spectrum reveals hyperbolic secant envelope [18] as indicated in the inset of Figure 5 . As expected, the numerical fit to type-II SR exhibits better agreement with experimental data.…”

Section: Sr In Narrow Ingan Multiple Quantum Well Heterostructuresmentioning

confidence: 92%

Two faces of superradiance in tandem-cavity ridge waveguide heterostructures

Boiko,

Torcheboeuf,

Mitev

et al. 2024

Quantum Sensing and Nano Electronics and Photonics XX

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Cooperative emission due to spontaneous build-up and rapid decay of macroscopic polarization in a strongly inverted gain medium is drastically different from the lasing dynamics. The medium polarization and not the cavity field drives the emission from a device in semiclassical Maxwell-Bloch picture. Yet as pioneered by Dicke, the decay of the highestenergy state in a quantum ensemble of two-level systems proceeds through a ladder of the highest-symmetry partially deexcited states, each of which is formalistically an entangled state in mathematical sense. In this paper we summarize our experimental and theoretical studies on the two fundamental aspects of superradiance in multi-section tandem cavity laser heterostructures: (i) How can the superradiance be reached in semiconductor quantum wells albeit the ultrafast dephasing of individual microscopic e-h dipoles? (ii) Could the ensemble non-classicality be transferred to the emitted optical field and what could be the resulting photon state?

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“…They are based on Gaussian disorder distributions. However, also other lineshapes convolving into exponential band tails are available in the literature [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…With increasing diode current, the originally inhomogeneous qw-spectrum deviates from the exponential shape and broadens into the bandgap. In this case, a unified pervasive (Voigt function like) lineshape is needed [13], but the describing functions are not the ones given in Equations ( 1) and (2).…”

Section: Introductionmentioning

confidence: 99%

A Unified Pervasive Linebroadening Function for Quantum Wells in Light Emitting Diodes

Viljanen¹

2020

Applied Sciences

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The broadening functions for quantum wells in LEDs and laser diodes below the lasing threshold are examined. Inhomogeneous and homogeneous broadening mechanisms are included. Hydrogen-atom-like exciton and the electron-hole plasma recombination models are considered. Material disorder and the Urbach tail are reviewed as the main reasons for the inhomogeneous broadening. Charge carrier scattering and relaxation times in the conduction and valence bands are examined as the origin for the homogeneous lifetime broadening. Two homogeneous lineshapes are compared using the momentum relaxation times obtained from the electron and hole mobilities available for GaAs. In addition to crystal disorder, the mutual collision of charge carriers in the quantum wells is examined as the reason for the relaxation time shortening. The analogy to pressure broadening in gases is used to combine the proper homogeneous and inhomogeneous broadening functions to a unified quantum well lineshape.

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Collective resonance and form factor of homogeneous broadening in semiconductors

Abstract: A comparative study of spontaneous emission and carrier recombination processes in InGaAs quantum dots and GaInNAs quantum wells emitting near 1300 nm

Cited by 11 publications

References 7 publications

Experimental determination of the internal quantum efficiency of AlGaInP microcavity light-emitting diodes

Experimental determination of the internal quantum efficiency of AlGaInP microcavity light-emitting diodes

Two faces of superradiance in tandem-cavity ridge waveguide heterostructures

A Unified Pervasive Linebroadening Function for Quantum Wells in Light Emitting Diodes

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