Electroluminescence of the electrolyte/n-ZnSe junction under anodic polarization

Gautron, Jean-Claude; Dalbera, Jean-Pierre; Lemasson, Philippe

doi:10.1016/0039-6028(80)90394-5

Cited by 14 publications

(3 citation statements)

References 12 publications

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“…EL from n-ZnSe under anodic polarization has also been reported (23). EL from n-ZnSe under anodic polarization has also been reported (23).…”

Section: Pec Properties--althoughmentioning

confidence: 89%

“…EL properties.--We have found that n-ZnSe:A1 electrodes mimic other II-VI electrodes (3) in exhibiting EL when used as a cathode in aqueous, alkaline, peroxydisulfate electrolyte. EL from n-ZnSe under anodic polarization has also been reported (23). The key step involved in populating the emissive excited state has been proposed to be hole injection by SO4 ~ radical anions formed by reduction of $2082-(24).…”

Section: Pec Properties--althoughmentioning

confidence: 94%

See 1 more Smart Citation

Zinc Selenide Photoelectrodes: Efficient Radiative Recombination in a Stable Photoelectrochemical Cell

Smiley

Biagioni

Ellis

1984

J. Electrochem. Soc.

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Photoluminescence (PL) and electroluminescence (EL) from single-crystal, n-type, Al-doped ZnSe (ZnSe:A1) electrodes have been studied. These samples exhibit both edge emission (k~a~ ~ 460 nm) and subbandgap emission when excited at several ultrabandgap wavelengths. The latter PL band is particularly intense, with a measured radiative quantum yield of -10 -I to 10-~; the transition appears to be at least partially self-activated (SA) in origin, based on previously reported PL data. Excited-state communication involving the two emissive states is inferred from time-resolved PL measurements. Stable photoelectrochemical cells (PEC's) can be constructed from n-ZnSe:A1 electrodes and aqueous diselenide or ditelluride electrolytes. Applied potential quenches both of the photoanodes' PL bands roughly in parallel. The extent of PL quenching is consistent with a dead-layer model previously used to describe quenching in Au-ZnSe Schottky diodes. When used as a dark cathode in aqueous, alkaline peroxydisulfate electrolyte, EL from ZnSe:A1 electrodes is observed. PL and EL spectral distributions are similar and indicate that the same emissive excited states are populated in the two experiments. Measured EL efficiencies, -10 -4 to 10 -6 at -2.2 and -1.8V vs. SCE, respectively, are much smaller than PL efficiencies. Possible sources of the discrepancies are discussed.Keen interest in photoelectrochemical cells (PEC's) has focused attention on the excited-state properties of the semiconductor electrodes which serve as the key element of these devices (1). We and others have studied photoluminescence (PL) and electroluminescence (EL) from a variety of II-VI and III-V semiconductor electrodes in an effort to determine the effect of PEC parameters on the solids' excited-state deactivation routes (2). In general, measured radiative quantum yields, ~br, of these materials have been small, -10-3-10 -~. We describe in this paper an electrode, n-ZnSe:A1, whose emission competes favorably (~br -10-1-10 -2) with other deactivation paths in stable, efficient PEC's. As observed with other semiconductor electrodes (3), the PL of n-ZnSe:A1 electrodes can be perturbed and EL initiated by interfacial charge-transfer processes. We show that PL quenching by applied potential is compatible with a dead-layer mode] used to describe such quenching in other PEC's (4, 5) and in Au-ZnSe Schottky diodes (6).) unless CC License in place (see abstract). ecsdl.org/site/terms_use address. Redistribution subject to ECS terms of use (see 128.192.114.19 Downloaded on 2015-06-07 to IP

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“…EL from n-ZnSe under anodic polarization has also been reported (23). EL from n-ZnSe under anodic polarization has also been reported (23).…”

Section: Pec Properties--althoughmentioning

confidence: 89%

Section: Pec Properties--althoughmentioning

confidence: 94%

Zinc Selenide Photoelectrodes: Efficient Radiative Recombination in a Stable Photoelectrochemical Cell

Smiley

Biagioni

Ellis

1984

J. Electrochem. Soc.

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“…Different techniques have been developed to detect the light resulting from luminescence and electroluminescence reactions. Those processes are commonly controlled by a potentiostat or an amperometric unit [ 15 - 17 ], which establishes potential differences or electric current flow between the electrodes of the cell, respectively. When there are no requirements regarding the volume or the power supply needed for the design, a good solution to detect the low light intensity generated by the CL reaction is the use of a photomultiplier tube (PMT) [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

A Portable Luminometer with a Disposable Electrochemiluminescent Biosensor for Lactate Determination

Martínez-Olmos¹,

Ballesta-Claver

Palma³

et al. 2009

Sensors

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A hand-held luminometer for measuring electrochemiluminescence (ECL) for lactate determination and based on one-shot biosensors fabricated using screen-printed electrodes is described. The lactate recognition system is based on lactate oxidase and the transduction system consists of electro-oxidation of luminol, with all the reagents immobilized in a Methocel membrane. The membrane composition and reaction conditions have been optimized to obtain adequate sensitivity. The luminometer is based on a large silicon photodiode as detector and includes a programmable potentiostat to initialize the chemical reaction and signal processing circuitry, designed to acquire a low level photocurrent with offset cancelation, low pass filtering for noise attenuation and adjustable gain up to 1012 V/A. The one-shot biosensor responds to lactate rapidly, with an acquisition time of 2.5 min, obtaining a linear dependence from 8 × 10−6 to 2 × 10−4 M, a detection limit of 2.4 × 10−6 M and a sensor-to-sensor reproducibility (relative standard deviation, RSD) of around 7–10 % at the medium level of the range.

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Photoelectrochemistry and Applications

Bouroushian

2010

Monographs in Electrochemistry

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Electroluminescence of the electrolyte/n-ZnSe junction under anodic polarization

Cited by 14 publications

References 12 publications

Zinc Selenide Photoelectrodes: Efficient Radiative Recombination in a Stable Photoelectrochemical Cell

Zinc Selenide Photoelectrodes: Efficient Radiative Recombination in a Stable Photoelectrochemical Cell

A Portable Luminometer with a Disposable Electrochemiluminescent Biosensor for Lactate Determination

Photoelectrochemistry and Applications

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