Luminescent photoelectrochemical cells. 4. Electroluminescent properties of undoped and tellurium-doped cadmium sulfide electrodes

Journal Article · Thu Nov 27 00:00:00 EST 1980 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100461a020· OSTI ID:6651433

Streckert, H H; Karas, B R; Morano, D J; Ellls, A B

Single-crystal, n-type, undoped CdS and Te-doped CdS (100 and 1000 ppM CdS:Te) electrodes exhibit electroluminescence (EL) in aqueous alkaline peroxydisulfate electrolyte. Addition of Te to CdS introduces intraband gap states which drastically alter the EL spectral distribution. The EL spectrum of undoped CdS consists of a sharp band near the band gap energy (approx. 2.4 eV) with lambda/sub max/ approx. 510 nm and a weaker, broader band at lower energy; the EL spectra of 100 and 1000 ppM CdS:Te also exhibit a sharp band at approx. 510 nm but are dominated by broad bands with uncorrected lambda/sub max/ approx. 600 and approx. 620 nm, respectively. Photoluminescence (PL) spectra, obtained with 457.9-nm excitation, aid in the assignments of the emissive transitions; PL spectra are generally similar to their EL counterparts. The potential dependence of the EL spectra was examined between approx. -1.2 V (onset) and -2.0 V vs. SCE. Changes in potential can affect both the relative and absolute intensities of the bands present in the EL spectra. Lower-limit, order-of-magnitude estimates of instantaneous EL efficiency, phi/sub EL/, have been made. Under steady-state conditions phi/sub EL/ is greater than or equal to 10/sup -6/ for undoped CdS and greater than or equal to 10/sup -5/ for CdS:Te. Results are discussed in terms of interfacial charge-transfer processes and the excited-state manifolds of CdS and CdS:Te.

• Research Organization: Univ. of Wisconsin, Madison
• OSTI ID: 6651433
• Journal Information: J. Phys. Chem.; (United States), Vol. 84:24
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
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PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
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PHOTOELECTROCHEMICAL CELLS
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CADMIUM COMPOUNDS
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INORGANIC PHOSPHORS
LUMINESCENCE
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400500* - Photochemistry
140505 - Solar Energy Conversion- Photochemical
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