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텅스텐옥사이드 박막을 이용한 일렉트로크로믹 표시소자에서 요오드이온 첨가효과
The Effect of Iodide Ion Addition in Electrochromic Display Device Using Tungsten Oxide Thin Film
HWAHAK KONGHAK, December 1988, 26(6), 633-640(8), NONE
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Abstract
텅스텐옥사이드 박막을 이용한 일렉트로크로믹 표시소자의 응답시간, 기억시간, 안정성, 발색 및 소색특성 등에 대하여 연구하였다.
Rf-sputtering에 의해 증착된 WO3층은 비결정질이었으며 표시전극의 WO3층의 두께가 5,000 Å인 경우 발색특성 및 안정성이 우수하였다.
전해질에 요오드이온을 첨가함으로써 대전극에서의 산소발생반응을 억제하였으며, 또한 빠른 응답속도 및 안정성 향상을 가할 수 있었다. 대전극에 WO3층을 입힌 경우 소색시 대전극에서 일어나는 수소발생반응을 억제하고텅스텐브론즈형성반응을 일으킴으로써 ECD（Electrochromic Display）의 수명연장 및 안정성 향상을 기할 수 있었다.
Rf-sputtering에 의해 증착된 WO3층은 비결정질이었으며 표시전극의 WO3층의 두께가 5,000 Å인 경우 발색특성 및 안정성이 우수하였다.
전해질에 요오드이온을 첨가함으로써 대전극에서의 산소발생반응을 억제하였으며, 또한 빠른 응답속도 및 안정성 향상을 가할 수 있었다. 대전극에 WO3층을 입힌 경우 소색시 대전극에서 일어나는 수소발생반응을 억제하고텅스텐브론즈형성반응을 일으킴으로써 ECD（Electrochromic Display）의 수명연장 및 안정성 향상을 기할 수 있었다.
The characteristics of response time, memory time, stability, coloration and bleach of electrochromic display device using WO3 thin film were studied.
The structure of WO3 layer deposited by rf-sputtering was identified as amorphous one.
The coloration and stability were dependent on the WO3 film thickness and showed the best performance in color and stability at 5,000Å.
The addition of iodide ion into gel electrolyte interrupted the oxygen evolution reaction on counter electrode and was able to enhance the response rate and stability of ECD cell.
In case of WO3 coated counter electrode, the hydrogen evolution reaction was interrupted by tungsten bronze formation in bleaching step and the life time and stability of ECD cell were improved.
The structure of WO3 layer deposited by rf-sputtering was identified as amorphous one.
The coloration and stability were dependent on the WO3 film thickness and showed the best performance in color and stability at 5,000Å.
The addition of iodide ion into gel electrolyte interrupted the oxygen evolution reaction on counter electrode and was able to enhance the response rate and stability of ECD cell.
In case of WO3 coated counter electrode, the hydrogen evolution reaction was interrupted by tungsten bronze formation in bleaching step and the life time and stability of ECD cell were improved.
