Demonstration of Assembly Failure of Light-Emitting Electrochemical Cells

電化學發光元件－元件缺陷及破壞之研究

王興龍(Hsing-Lung Wang) ； 溫添進(Ten-Chin Wen) ； 楊乾信(Chien-Hsin Yang)

《Journal of the Chinese Institute of Chemical Engineers》 34卷5期 (2003/09) Pp. 581-586

https://doi.org/10.6967/JCICE.200309.0581

摘要

在本研究中以PPV及WPUI?混作為電化學發光元件之發光層，透過不同的案例分析其元件缺陷以及破壞原因。電化學發光元件包含了電致發光高分子以及高分子電解質，在單層結構的電化學發光元件中，高分子溶液使用旋轉塗佈的方式在導電玻璃(ITO)上形成一均勻的薄膜，繼之用真空蒸鍍的方式鍍上一層金屬層電極形成發光元件，當給予一偏壓時在正極附近形成p-doping而負極附近形成n-doping，對離子往兩極靠近以穩定其氧化或還原態，當給予偏壓超過其電子電洞躍遷能階時即能產生光。研究中以循環伏安法探討其常見之元件缺陷及破壞機制，提供相關領域研究者在元件缺陷與操作條件造成元件破壞原因相關的參考。

並列摘要

Light-emitting electrochemical cells (LECs) have been fabricated by employing thin films of the blend poly(p-phenylene vinylene) (PPV) and waterborne polyurethane ionomer (WPUI) neutralized with lithium hydroxide, sandwiched between an anole (indium tin oxide coated glass, ITO) and a cathode (A1). The conjugated polymer is p-doped and n-doped on the opposite side of the polymer layer when the external bias is applied, and a light-emitting p-n junction is in-situ formed in this assembly. The counterions are provided by WPUI to make the matrix ionically conducting, which is necessary for doping. Green light emission was observed in this study with a onset voltage of about 2.4 V. The LEC characteristics of normal LEC devices and those that had experienced assembly failure were studied using cyclic voltammetry. The results of this study would be useful to the new researchers interested in fabricating and characterizing LECs.

並列關鍵字

Light-emitting electrochemical cells ； Luminescence ； Conjugated polymer ； Waterborne polyurethane ionomer ； Polymer electrolyte