摘要
电致变色器件是一种典型的光学薄膜和电子学薄膜相结合的光电子薄膜器件,能够在外加低压驱动的作用下实现可逆的色彩变化。将电致变色材料制备在塑料衬底上,将极大地推动电致变色器件的应用。讨论了全固态塑料电致变色器件的制备工艺和电致变色特性,通过采用低压反应离子镀工艺分别在ITO塑料衬底上制备了WO3和NiO电致变色薄膜。采用高分子聚合物MPEO-LiClO4作电解质,制备plastic/ITO/WO3/MPEO-LiClO4/NiO/ITO/plastic透射型全固态塑料电致变色器件。在二电极电池石英盒中采用恒电位方式测试全固态塑料电致变色器件的电致变色特性,驱动电压为±3V。采用分光光度计直接测试透射光谱的变化,测试范围为300～900nm,经过十几次循环后达到稳定的变色,变色调制范围达到30%左右,器件样品显示出均匀深蓝色的电致变色效果。实验结果证明了所提出的全固态塑料电致变色器件的制备工艺的可行性。
The prepare processing and electrochromic characteristics of all solid-state plastic electrochromic devices are discussed. We chose WO3 thin film as cathode electrochromic material and NiOx thin film as counter electrode. All of these two thin films were coated on ITO plastic substrate respectively by low voltage reactive ion plating technology. Spectrum characters of as-deposited, bleached and colored state of these two thin films with different coating parameters were contrasted to optimize processing. It was tested that transmittance changes of WO3 film was about 35% with argon pressure of 2.2 × 10^-2 Pa and oxygen pressure of 4 × 10^ -2 Pa, transmittance changes of NiOx film was about 18% with argon pressure of 2.5 ×10^ -2 Pa and oxygen pressure of 6 × 10^-2 Pa. Then we synthesized MPEO-LiClO4 polymer as solid-state electrolyte, which was put in the middle of WO3 and NiOx film. After binding, assembling and sealed by plastic protective films, a new type of all solid-state plastic electrochromic device with plastic/ITO/WO3/MPEO-LiClO4/NiO/ITO/plastic structure has been successful fabricated. The spectrum characters of this electrochromic device in bleached and colored states were contrasted in two-electrode cell. The changes of transmittance were real-time measured by spectrophotometer. The results show that electrochromic characters were getting stable after ten times of cycles, and changes of transmittance was about 30%. The color change of device sample could be visual displayed, so we think this all solid-state plastic electrochromic device could be widely applied in display, electrochromic windows and other fields, through making use of such electrochromic properties. It was proved that electrochromic device could be prepared on the plastic substrate with all solid-state structure, and the prepare processing was feasible. But compared with electrochromic device prepared on glass substrate with liquid electrolyte, electrochromic properties and performance of this all solid-state plastic electrochromic device need to more improve and lucubrate.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2007年第2期251-255,共5页
Chinese Journal of Luminescence
关键词
电致变色
全固态
塑料
electrochromic
all solid-state
plastic
