Background: The energy efficiency of optoelectronic devices in aqueous solutions was derived
using a simple mathematical criterion. The criterion was based on calculating the limit of the ratio
value of the conductivity of an optoelectronic material in aqueous solution (σs) to the conductivity of
the optoelectronic material in air (σair). In other words, the criterion; lim (σs/σair) =1 was applied to determine
the energy efficiency of the optoelectronic material in the aqueous solution when σs became
equal (decreased) to σair as a function of time of the exposure of the material to the aqueous solution.
The values of σs and σair were determined by the electrochemical impedance spectroscopy (EIS). The
energy efficiency of an optoelectronic devise, i.e., computer disc(CD) material, was evaluated in distilled
water and polluted water with a predetermined period of optoelectronic operations.
Methods: The electrochemical impedance spectroscopy (EIS) was used to determine values of σs
and σair of the computer disc(CD) material, Al2O3, in distilled water and a polluted water.
Results: The energy efficiency of the computer disc(CD) material, Al2O3, was evaluated in distilled water
and polluted water with a predetermined period of 12 months.
Conclusion: A derived analytical model (lim (σs/σair) =1, as σs → σair) of the energy efficiency of optoelectronic
materials was used to Plot; lim (σs/σair) vs. time of exposure of the pure Al, Al2O3, and Al2O3 in
air, distilled water, and polluted water, respectively. Therefore, plots of the lim (σs/σair) vs. time of exposure
like those of Figs. (2-4) can be standard plots of energy efficiency for different kinds of optoelectronic