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Electric double layer dynamics by high-field electroluminescence in aqueous solution (Destriau effect)
Z A Schelly1, K Lundy-Douglas, H Eyring
1Department of Chemistry, University of Texas at Arlington, Arlington, Texas 76019.
Summary
High electric fields induce transient luminescence in 6,8-dihydroxypyrene-1,3-disulfonic acid solutions. This light emission, similar to the Destriau effect, occurs during electric field changes and decays rapidly.
Area of Science:
- Photophysics
- Electrochemistry
- Materials Science
Background:
- The Destriau effect, a form of luminescence, is known in solid-state phosphors under high electric fields.
- Understanding transient luminescence in aqueous solutions is crucial for developing new optical materials and sensors.
Purpose of the Study:
- To investigate transient luminescence in aqueous solutions of 6,8-dihydroxypyrene-1,3-disulfonic acid under high electric fields.
- To elucidate the excitation and emission mechanisms of this phenomenon.
Main Methods:
- Application of high electric fields (>2.5 x 10^4 V/cm) to aqueous solutions of 6,8-dihydroxypyrene-1,3-disulfonic acid.
- Observation and measurement of light emission during electric square pulse application.
- Analysis of luminescence decay kinetics.
Main Results:
- Transient luminescence was observed in aqueous solutions of 6,8-dihydroxypyrene-1,3-disulfonic acid.
- Light emission occurred at the leading and trailing edges of the electric pulse, ceasing at constant fields with a 0.5 μsec time constant.
- The phenomenon is analogous to the Destriau effect observed in solid-state phosphors.
Conclusions:
- The observed luminescence can be explained by an electron injection model.
- The luminescence decay time constant is linked to space charge formation, creating a double layer stabilized by the electric potential.
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