π-アグレガートのコファシアルおよびスライドスタックされたペリレン-3,4-ジカルボキシミドジマーモデル内のエネルギーフローの動態
Rebecca J Lindquist1, Kelly M Lefler, Kristen E Brown
1Department of Chemistry and Argonne-Northwestern Solar Energy Research (ANSER) Center, Northwestern University , Evanston, Illinois 60208-3113, United States.
Journal of the American Chemical Society
|September 24, 2014
まとめ
研究者は,エクシマートラップ状態を理解するために,ペリレン-3,4-ジカルボキシミド (PMI) ダイマーを研究した. 最適なスリップスタッキング幾何学はエクシマーの寿命を最大化し,有機デバイス設計の洞察を提供します.
科学分野:
- オーガニック・エレクトロニクス
- フォトボルトイカは,太陽光発電です.
- マテリアルサイエンス 材料科学
背景:
- ペリレン-3,4-ジカルボキシミド (PMI) π-アグレガートは,有機光伏の光集約に不可欠です.
- PMI染色体間の電子相互作用を理解することは,デバイスのパフォーマンスを最適化するための鍵です.
- エクシプレックストラップ状態は,有機電子機器の効率を制限することができます.
研究 の 目的:
- 染色体指向とエクシマーのエネルギートラップ状態の関係について,共振的に結合されたPMIダイマーで調べる.
- PMIベースの有機器具における有害なエクシマーの形成を最小限に抑える構造的要因を決定する.
主な方法:
- 異なる電子相互作用を持つ5つの共性結合のPMIダイマーの合成.
- エクシマー状態の動態を観察するために,フェムト秒間近赤外線一時吸収スペクトロスコーピーを用いる.
- エクシマー状態の寿命を測定するための時間分解の光スペクトロスコーピー.
主要な成果:
- エクシマー状態の吸収は,約1450-1520 nmで ~1 ps. の範囲で観察されました.
- エクシマー状態の適合性緩和は8~17psで発生した.
- ~4.3 Å 位移のスライド・スタックされた幾何学で観察されたエクシマーの最大寿命 (6.9−12.8 ns)
- ビフェニルスペーサーはエクシマーの形成を阻害し,最小限の電荷移転またはトリプレット収量が観察されました.
結論:
- 特定のスリップスタック幾何学は,PMIジメルのエクシマー状態の形成と安定化に不可欠です.
- 染色体配列に対する構造的制御は,望ましくないエクシマートラップ状態を最小限に抑えることができます.
- 発見は,PMIデリバティブを使用する高性能有機電子機器の設計のためのガイドラインを提供します.
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