Typically, dimethylformamide (DMF) solvent containing 2 X mole of rubrene as the fluorescent compound and 0.1 mole of tetrabutylammonium perchlorate as the supporting electrolyte is a system which will emit light, without any appreciable consumption of the solution components of the system as compared to prior systems, when placed in an electrolytic cell containing electrodes and 60-cycle alternat