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《Chinese Journal of Luminescence》 2001-03
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Application of Voltammetry Method in Electroluminescence Cell

CHEN Zhen 1, ZHENG Xi 1, CHEN Ri yao 1, QU Yao wen 1, CHENG Wei 1, ZHANG Yi kang 2 (1 Experiment Center, Fujian Normal University, Fuzhou 350007, China; 2 Shandong, Linyi Normal College, Linyi 276001, China)  
Thd contribution of electrochemistry method to the research of the electroluminescence cell has been discussed in this paper. In the electroluminescence cell electrons coming from metal electrode (such as Al, Mg) inject into the lowest unoccupied orbital (LUMO) and radioactively recombine with holes to generate electroluminescence. The energy transport can be calculated by electro chemistry method in the theory . The energy of LUMO and HOMO is corresponded to the potential of cathodic current peak and anodic current peak in the voltammogram chart,respectively.But the experiment results indicated that it is difficult to calculate the band gap energy accurately using electrochemistry method from I V voltammogram chart,because the electrode process in teh interface between the electrode and the solution is so complicated that much polar potential,such as double electronic layer polarization,concentration polarization need to be considered.In fact the I V voltammogram still give us many useful massages to explain the EL behaviors.The electrodic potentials in a redox reaction in dicate the attention ability for accepting or losing electrons in a electrochemistry reaction.A bigger I V area in the voltammogram will show a bigger charge or discharge quantity as a electron accepter or a electron donor.It is easy to find out most of organic polymers possessing conjugated double bonds appear a reversible redox characteristics such as polythiophene and 3 methyl poly thiophene. Ultra violet spectrograph and voltammograms of organic luminescent material,Alq,BBOT and PBD have been investigated in this paper.Results of I V cyclic voltammograms indicated Alq,BBOT and PBD apperas unreversible electrochemistry process with a big cathodic current peak,the cathodic reduction potential of PBD is more negative than that of Alq.Both of results of UV and voltammograms are in a good agreement with the electroluminescence behaviors.
【Fund】: 福建省自然科学基金资助项目 (A9910 0 0 9)
【CateGory Index】: TN383
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