レドックス反応性キラルドーパント 快速電気化学色調 コレステリック液晶
Shoichi Tokunaga1, Yoshimitsu Itoh1, Hiroyuki Tanaka1
1Department of Chemistry and Biotechnology, School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 113-8656 , Japan.
Journal of the American Chemical Society
|August 3, 2018
まとめ
液晶の色を電気的に調節する 新種のリドックス活性キラルドーパントを開発しました コレステリック液晶ディスプレイで 低電圧で色を切り替えることが可能になりました
科学分野:
- 材料科学
- 有機化学
- 電気化学
背景:
- コレステリック液晶 (LC) は,螺旋状の構造に基づいてユニークな光学特性を示す.
- ドーパントの螺旋回転力 (HTP) を制御することは,LCの色調を調整するために不可欠です.
- LCの電気カラー調節のための既存の方法は,しばしば遅い応答時間または高い動作電圧に苦しんでいます.
研究 の 目的:
- HTPを電気的に調節できる最初のリドックス活性キラルドーパント,FcDを導入する.
- FcDでドーピングされたコレステリックLC媒体の迅速かつ可逆的な電気化学的色転換を実証する.
- 応答時間と動作電圧の観点からこのシステムの性能を評価する.
主な方法:
- FcDの合成で,軸性バイナプチル単位と酸化還元活性フェロセンの単位を組み合わせる.
- コレステリックLC (4'-ペンチロキシ-4-シアノビフェニル) をFcDでドーピングし,酸化時に色の変化を観察する.
- インジウム亜鉛電極を備えたサンドイッチ型のガラスセルを使用して,反射色を電気化学的に調節する.
主要な成果:
- 合成されたFcDドーパントは,コレステリックLCで青い反射色を成功裏に誘導しました.
- FcDをニトロシルテトラフルオロボラートで酸化すると,HTPが13%減り,色が緑色に変わります.
- 電気化学制御は+1.5Vで0.4秒以内に青から緑に変化し,0Vで青に戻った.
結論:
- FcDは,HTPとLCの色を電気的に調節する最初の報告されたリドックス活性キラルドーパントです.
- FcドーピングされたコレステリックLCシステムは,電気駆動型LC装置の中で最も速い電気化学反応と最も低い動作電圧を示しています.
- この研究は,先進的な電染色材料とディスプレイの開発のための新しい道を開きます.
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