Luminescence from electron-hole liquid in gallium phosphide influenced by the isoelectronic impurity nitrogen

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Unusual phase separation of excited carriers in isoelectronically doped GaP is discussed in terms of two models: (i) a perturbed neutral electron-hole plasma, and (ii) electrons assumed to be strongly localized a t the isoelectronic impurities embedded in a non-neutral electron-hole plasma. For low carrier densities where excitons are stable particles due to low screening, the special situation involving nitrogen pairs is taken into account.Ungewohnliche Phasentrennung von angeregten Ladungstragern in isoelektronisch dotiertem GaP wird auf der Grundlage zweier Modelle diskutiert: (i) eines gestorten neutralen Elektron-Loch-Plasmas und (ii) eines nichtneutralen Elektron-Loch-Plasmas, das zusLtzlich an Storstellen lokalisierte Elektronen enthllt. Fur niedrige Tragerdichten, bei denen die Exzitonen infolge geringer Abschirmung stabil sind, wird die spezielle Situation unter Einbeziehung von Stickstoffpaaren beriicksichtigt.

Section: Resultssupporting

confidence: 82%

Section: F T H~s E L Tmentioning

confidence: 97%

On the Phase Separation of Carriers in Nitrogen‐Doped GaP

Thuselt

1980

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“…Though the underlying mechanism is completely different, the result is formally equivalent with that for two-level systems (22), but with a cw saturation intensity given now by The analysis in Section 4.2 has yielded that for neq the corresponding value of the "lowdensity" phase has t o be used. This represents further evidence for the existence of such phase, so far only deduced from luminescence experiments [6]. The neq of the "low-density" phase exceeds only slightly the nitrogen concentration.…”

Section: Final Remarksmentioning

confidence: 88%

On the Bleaching of the A‐Bound Exciton Absorption in GaP: N. An Example for an Electron–Hole Liquid Induced Optical Nonlinearity

Woggon

Henneberge

Weinert

1987

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The intensity dependence of the A-line absorption in GaP:N is investigated a t various nitrogen concentrations and a t different excitation conditions, i.e. for resonant and band-to-band excitation. For the intensity levels, which are necessary to saturate the absorption, simultaneous luminescence measurements have clearly shown the formation of an electron-hole liquid in the excited region. An explanation is given of the experimental findings which takes into account the presence of an electron-hole liquid in the sample. Es wird die Intensitiitmbhingigkeit der Absorption der A-Linie in Gap: N bei verschiedenenStickstoffkonzentrationen und unter verschiedenen Anregungsbedingungen (resonante Anregung und Band-Band-Anregung) untersucht. Fur die zur Absorptionssiittigung notwendigen Anregungsintensititen kann durch simultane Messung der Lumineszenz die Bildung einer ElektronLoch-Flussigkeit im angeregten Gebiet nachgewiesen werden. Die experimentellen Ergebnisse zur intensitlitsabhangigen Absorptionsveriinderng werden unter Beriicksichtigung der Wirkung dieser Elektron-Loch-Flussigkeit erkliirt.

“…For the time dependence of the number NG of carriers bound in the LDP (X,) one gets M represents the number of EHD. The first term on the right-hand side of (6), (7) describes the radiative and non-radiative recombination in the EHL and LDP (XB), respectively. The second term expresses all carrier exchange processes between both coexisting phases.…”

Section: P Model For Decaymentioning

confidence: 99%

“…[5,7,11,121). At low nitrogen concentrations (nN = 2 x lo1' to 3 x 10'' ~m -~) the luminescence corresponding to this second phase is the so-called XB-line [ll]; for medium nitrogen concentrations (n,N = 1018 to 6 x 10l8 cm-a) it will be denoted as low-density phase (LDP).…”

Section: Introductionmentioning

confidence: 99%

Decay behaviour of high‐excitation luminescence in GaP:N. I. Model for the decay of two coexisting phases

Weinert

1983

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The time behaviour of the radiative recombination of nitrogen-doped GaP is investigated a t pulsed intense optical excitations and low temperatures (2' = 2 and 27 K). The decay behaviour of the luminescence intensities corresponding to the electron-hole liquid (EHL) and the coexisting lowdensity phase (LDP) is found for all nitrogen concentrations (nN = 2 x 10'' to 2.9 x 10'8 ~3 1 1~~) to be nonexponential. It is interpreted as a consequence of interactions between both coexisting phases. A model is introduced where the EHL is fed by the LDP continuously. It describes the observed decay of the luminescence very well, even for different nitrogen concentrations and different excitation intensities.Es wird das Zeitverhalten der strahlenden Rekombination von stickstoffdotiertern GaP unter intensiver optischer Impulsanregung bei T = 2 und 27 K untersucht. Das Abklingverhalten der Lumineszenzintensititen, die der Elektron-Loch-Fliissigkeit (EHL) sowie der koexistierenden Niederdichtephase (LDP) entsprechen, ist fur alle hier untersuchten Stickstoffkonzentrationen (TLN = 2 x 10'' bis 2,9 x 10l8 nichtexponentiell. Es wird als Folge der Wechselwirkungen zwischen beiden koexistierenden Phasen angesehen. Ein entsprechendes Modell wird vorgeschlagen, wobei die EHL laufend von der LDP aufgefiillt wird. Es beschreibt das Abklingverhalten der Lumineszenz beider koexistierenden Phasen fur unterschiedliche Stickstoffkonzentrationen nnd Anregungsintensitaten sehr gut.