Electrochromic devices (ECDs) have been drawing great attention due to their high color contrast, low power consumption, and memory effect, and can be used in smart windows, automatic dimming mirrors, and information display devices. As with other electronic devices such as LEDs (light emitting diodes), solar cells, and transistors, the mechanical flexibility of ECDs is one of the most important issue for their potential applications. In this paper, we report on flexible ECDs (f-ECDs) fabricated using an all-in-one EC gel, which is a mixture of electrolyte and EC material. The f-ECDs are compared with rigid ECDs (r-ECDs) on ITO glass substrate in terms of color contrast, coloration efficiency, and switching speed. It is confirmed that the f-ECDs embedding all-in-one gel show strong blue absorption and have competitive EC performance. Repetitive bending tests show a degradation of electrochromic performance, which must be improved using an optimized device fabrication process.

Abstract
1. Introduction
2. Experimental Procedure
3. Results and Discussion
4. Conclusion
References

• 박보성(한국기술교육대학교 에너지신소재화학공학부) | Bo-Seong Park (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education)
• 김현정(한국기술교육대학교 에너지신소재화학공학부) | Hyun-Jeong Kim (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education)
• 신현호(한국기술교육대학교 에너지신소재화학공학부) | Hyeonho Shin (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education)
• 박성민(한국기술교육대학교 에너지신소재화학공학부) | Seongmin Park (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education)
• 이재운(한국기술교육대학교 에너지신소재화학공학부) | Jaeun Lee (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education)
• 전성건(한국기술교육대학교 에너지신소재화학공학부) | Sunggun Jeon (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education)
• 나윤채(한국기술교육대학교 에너지신소재화학공학부) | Yoon-Chae Nah (School of Energy, Materials, and Chemical Engineering, Korea University of Technology and Education) Corresponding author