利用熱延遲螢光分子優化太陽能儲存的新方法

Abstract

我們提出了分子太陽能熱（MOST）儲能的新概念，並使用具有熱激活延遲熒光(TADF)特性的分子作為光敏劑和信號傳感器藉以啟動和監測降冰片二烯(NBD)/四環烷(QC)系統的光誘導轉化。TADF分子的微小ΔEST進一步優化光敏劑和太陽光之間的光譜匹配。此工作成功合成了PZDN、PZTN和PZQN，並用穩態和時間分辨光譜進行檢測。通過調整三重態能量，PZDN和PZTN 表現出顯著的NBD→QC轉換，而PZQN的轉換效率則不顯著。在室溫下催化下，QC進行逆反應生成NBD。

A new concept on molecular solar thermal (MOST) energy storage was proposed. Molecules with thermally activated delayed fluorescence (TADF) character were utilized as photosensitizers and signal transducers to initiate and monitor the photoinduced conversion of norbornadiene(NBD)/quadricyclane(QC) isomer pair. The small ΔEST of TADF molecules provide an opportunity to optimize the spectral match between the photosensitizer and sun light. PZDN, PZTN and PZQN were successfully synthesized and characterized with steady state and time resolved spectra. By tuning the triplet state energy, PZDN and PZTN showed prominent NBD→QC conversion while that of PZQN was inefficient. Upon catalysis at room temperature, QC undergoes a clean reverse reaction to NBD.