The tuning stability of an electrically tunable photonic crystal composed of long-range ordered crystalline colloidal arrays is significantly improved by modifying an ITO electrode with ion-exchange resins. The thin layer of over-coating on the ITO surface increases the number of cycles of stable color-tuning switching from red to green to over 800 times, which is the best result ever reported for a tunable photonic crystal whose stop-band position can be manipulated more than 100 nm.
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Han et al. (2014) studied this question.
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