分子路线图调整长波吸收器的地面状态吸收和激发状态动态
Yusong Bai1, Jean-Hubert Olivier1, Hyejin Yoo1
1Department of Chemistry, French Family Science Center, Duke University , 124 Science Drive, Durham, North Carolina 27708-0346, United States.
Journal of the American Chemical Society
|October 19, 2017
概括
研究人员为光电子应用开发了一种新的分子架构,M-{PM') n-M. 这种设计实现了强烈的近红外吸收和长寿命的三重状态,克服了以前染色体发展的局限性.
科学领域:
- 材料科学
- 摄影化学
- 有机电子
背景情况:
- 开发具有强烈近红外 (NIR) 吸收和长寿命三重激发状态的染色体对于光电子应用至关重要,例如光功率限制和三重-三重消灭光子上转换 (TTA-UC).
- 由于能量差距定律,现有的染色体往往难以实现实质性的NIR吸收性和高产量,长寿命的三重体状态,使得分子工程具有挑战性.
研究的目的:
- 提出设计具有显著NIR吸收性和长寿命,高产量的三重激发状态的多功能方法.
- 探索以乙烯为桥梁 (多) 金属的光物理特性 (M-PM) n-M).
主要方法:
- 合成和表征以乙烯桥接 (多) 金属 (M-PM) n-M) 分子结构,其中M = Ru,Os和M' = Zn,Pt,Pd.
- 研究重金属d轨道对一个电子激发配置的影响,以调整光物理性质.
- 对光 (k F),非辐射衰变 (knr),系统间交叉 (kISC) 和三重放松 (kT 1 → S 0) 的分析速率常数.
主要成果:
- 达到高振荡器强度的NIR吸收率高达850nm,近单位交叉 (ISC) 量子产量 (Φ ISC) 和微秒级三重激发状态 (T1) 寿命.
- 在M-{PM}n-M框架内通过不同的金属中心和氨酸单位证明了光物理速率常数的微调.
- 与传统协调复合物和有机材料相比,观察到显著增强的NIR吸收性,在适度的S1 - T1能量间隙 (∼0.25 eV) 时具有高的Φ ISC.
结论:
- 该平台为设计光电子应用所需的光物理性质的染色体提供了一种多用途的方法.
- 这项研究提出了一种新型的长波吸收器,能够有效地填充长寿命的三重状态,解决该领域的关键需求.
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