Reaction Mechanism and Improved Performance of Solution-Based Electrochemiluminescence Cell Driven by Alternating Current

Abstract

An AC-driven light-emitting cell based on the electrochemiluminescence (ECL) of tris(2,2'-bipyridyl)ruthenium(II) [Ru(bpy)3 2+] was fabricated by simply placing the electrolyte solution between transparent electrodes, and this AC-driven ECL cell was demonstrated for comparison to a DC-ECL cell. The properties of the ECL cell were dramatically improved by using the AC method. The AC-ECL cell showed the luminance of 56.4 cd/m2, the current efficiency of 0.78 cd/A and the turn-on response time of ca. 15 ms under application of 4 V, 50 Hz AC. We also elucidated the detailed mechanisms of the AC-ECL reaction to monitor the faradaic current. These improved properties and the frequency dependence of the AC-ECL cell were discussed in the relation to the revealed mechanisms.

Ultrafast Response in AC-Driven Electrochemiluminescent Cell Using Electrochemically Active DNA/Ru(bpy)3 2+ Hybrid Film with Mesoscopic Structures

“…Figure 3 shows the frequency dependence of the normalised ECL intensities under ±4 V rectangular voltage. ECL from the solution-based device was only observed at frequencies below 500 Hz, which is similar to previous reports 20, 21 . On the other hand, in the DNA/Ru(bpy) 3 2+ hybrid film-based device, ECL was observed at frequencies as high as 10 kHz surprisingly.…”

“…Thus, the response time of ECL is not very short and depends on the thickness of the cell. In order to overcome this problem, we found that the ECL properties can be enhanced by using alternating current (AC) 19, 20 . Compared to the DC-driven system, the AC-driven counterpart does not require long-range diffusion of the reduced and oxidised species, because they are generated at the same electrode.…”

Effect of Thickness in Carbon Nanotube Electrode Layer for Electrochemi-Luminescence Cells Applications

“…After that, the crystalline collected by and dried under vacuum for 24 h [7]. The Ru(bpy) 3 (FP 6 ) 2 powder and PC solution ratio are achieved at 0.04g : 0.448g for [19][20]. Fig.…”

Electrochemical Materials for Novel Light Emitting Device and Dual Mode Display

“…The method is based on using an alternating current (AC) to operate the device [8,17,18]. During an AC cycle, oxidized and reduced species are generated at the same electrode surface because the bias polarity reversibly switches between anode and cathode, resulting in the efficient ECL generation without long-distance diffusion of the relevant species [ Figure 1(b)].…”