Luminescent photoelectrochemical cells. 4. Electroluminescent properties of undoped and tellurium-doped cadmium sulfide electrodes
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), Journal Name: J. Phys. Chem.; (United States) Vol. 84:24; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
Similar Records
Luminescent photoelectrochemical cells. 5. multiple emission from tellurium-doped cadmium sulfide photoelectrodes and implications regarding excited-state communication. Technical report
Luminescent photoelectrochemical cells. 5. multiple emission from tellurium-doped cadmium sulfide photoelectrodes and implications regarding excited-state communication. Technical report
Related Subjects
140505 -- Solar Energy Conversion-- Photochemical
Photobiological
& Thermochemical Conversion-- (1980-)
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
CADMIUM COMPOUNDS
CADMIUM SULFIDES
CHALCOGENIDES
CRYSTAL DOPING
DATA
ELECTROCHEMICAL CELLS
ELECTROLUMINESCENCE
ELEMENTS
EQUIPMENT
EXPERIMENTAL DATA
INFORMATION
INORGANIC PHOSPHORS
LUMINESCENCE
NUMERICAL DATA
PHOSPHORS
PHOTOELECTROCHEMICAL CELLS
SEMIMETALS
SOLAR EQUIPMENT
SPECTRA
SULFIDES
SULFUR COMPOUNDS
TELLURIUM