Green electroluminescence and photoluminescence in CdS

Fan, X.W.; Woods, J.

doi:10.1002/pssa.2210700138

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…14 At room temperature, CdS is known for the difficulty to achieve green emission at the bandgap. 15 Rather frequently, it occurs that no emission in the green spectral range is observed at all or the emission spectra are visually dominated by red photoluminescence due to impurities and sulfur vacancies. The TPL spectrum of the CdS crystal shown in Fig.…”

Section: Experimental Setup and Resultsmentioning

confidence: 99%

Intensity dependence of two-photon absorption in CdS measured by photoluminescence excited by femtosecond laser pulses

Dushkina

2002

Opt. Eng

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Two-photon absorption is evoked in a CdS crystal by laser excitation up to almost 200 GW/cm 2 at 804 nm. Pulses with duration of 200 fs are used to achieve this high intensity. By means of a z-scan technique, the nonlinear absorption coefficient (␤) is measured and the constant value of ␤ϭ6.9 cm/GW was found. Simultaneously, the twophoton excited emission is recorded. Examination of the photoluminescence data reveals that ␤ is not constant but decreases from 6.9 to 2.9 cm/GW with increasing excitation. The crossover between the ␤ values takes place at approximately 70% of the maximum intensity. The result shows that the two-photon excited photoluminescence is a very sensitive method to show saturation and intensity dependence of the nonlinear absorption coefficient.

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Section: Experimental Setup and Resultsmentioning

confidence: 99%

Intensity dependence of two-photon absorption in CdS measured by photoluminescence excited by femtosecond laser pulses

Dushkina

2002

Opt. Eng

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“…12 It is noteworthy that the emission takes place according to the straightforward principle of detailed balance since CdS is known to show peculiar emission features far from the ideal case. 13 As shown in Figs. 2͑a͒ and 2͑b͒, the TPL peak is at 2.35 eV and 2.40 eV for CdS Ќ and CdS ʈ , respectively.…”

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confidence: 79%

Two-photon-excited green emission and its dichroic shift of oriented thin-film CdS on glass formed by laser deposition

Ullrich

Schroeder

Sakai

et al. 2002

Applied Physics Letters

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The photoluminescence of oriented thin-film CdS on glass formed by laser deposition was investigated employing 200 fs, 1.54 eV laser pulses at room temperature. The ultrafast excitation caused a two-photon absorption process, which results in purely green emission at the band gap. The spectra are fitted very well by the application of the van Roosbroeck–Shockley relation, density of states, and Urbach’s rule demonstrating the intrinsic character of the radiative recombination. It is further shown that the energy position of the emission peak depends on the polarization of the impinging laser beam due to the dichroism of the highly oriented films.

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“…The II-VI compound semiconductor CdS is an appealing host material for light emitting devices (LEDs) due to its theoretical capability to emit green light close to the highest sensitivity to the human eye. However, crystalline CdS shows rather poor photoluminescence (PL) features at 300 K [1]. In many cases the material shows either no emission at the gap energy or the emission spectrum is visually dominated by red emission clearly below the gap at about 2.45 eV [2].…”

mentioning

confidence: 99%

Intrinsic gap emission and its geometry dependence of thin-film CdS excited by two-photon absorption

Schroeder

Sakai

2001

Semicond. Sci. Technol.

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The emission of thin-film CdS on glass is investigated by ultra-fast pulsed excitation at room temperature. It is demonstrated that, in contrast to single-photon excitation, two-photon excitation causes intrinsic gap emission in extrinsic samples without transitions below the gap. The spectra are perfectly fitted by the van Roosbroeck-Shockley relation, which describes the detailed balance between absorption and emission. The spectrum measured through the glass is shifted 40 meV to lower energies with respect to the front emission due to increased absorption at the glass/CdS interface.

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Green electroluminescence and photoluminescence in CdS

Cited by 12 publications

References 20 publications

Intensity dependence of two-photon absorption in CdS measured by photoluminescence excited by femtosecond laser pulses

Intensity dependence of two-photon absorption in CdS measured by photoluminescence excited by femtosecond laser pulses

Two-photon-excited green emission and its dichroic shift of oriented thin-film CdS on glass formed by laser deposition

Intrinsic gap emission and its geometry dependence of thin-film CdS excited by two-photon absorption

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