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在一个无序的烯膜中发现了高效的单点裂变
Sean T Roberts1, R Eric McAnally, Joseph N Mastron
1Department of Chemistry and the Center for Energy Nanoscience, University of Southern California, Los Angeles, California 90089-0482, USA.
Journal of the American Chemical Society
|March 22, 2012
概括
在无形的5,12-二四 (DPT) 薄膜中的单片激子裂变产生了高的三倍生成. 混乱促进了裂变,三胞胎在较长时间内迅速形成,挑战了以前的假设.
科学领域:
- 有机半导体 有机半导体
- 太阳能光伏发电是如何实现的
- 刺激的动力学 刺激的动力学
背景情况:
- 单元刺激子裂变将一个单元刺激状态分裂为两个三元刺激子.
- 这一过程是有机光伏 (OPV) 超越Shockley-Queisser极限的关键.
- 以前只在晶体材料中观察到高产量,这表明乱抑制了裂变.
研究的目的:
- 在无形的5,12-二四 (DPT) 薄膜中研究单点刺激子裂变.
- 确定分子失调对裂变效率的影响.
- 在DPT中描述三重组形成的动力学.
主要方法:
- 超快速的短暂吸收光谱法
- 时间分辨率的排放光谱学.
- 对无形DPT薄膜的分析.
主要成果:
- 无形DPT膜具有较高的单点裂变产率 (每激发单点1.22个三倍).
- 三胞胎的形成发生在两个时间尺度上:在1ps内~50%,随后在数百个皮秒内增长速度较慢.
- 一个模型表明裂变发生在无序的薄膜内的特定二极体配置中.
结论:
- 分子乱不一定会抑制单点刺激子裂变.
- DPT的无形性质和特定的分子结构促进了高效的裂变.
- 在无序系统中,单点刺激子可能扩散到有利于裂变的位置.
相关概念视频
Structure and Physical Properties of Alkynes
Introduction:
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The simplest alkyne is ethyne, or...
In nature, compounds containing both carbon and hydrogen are known as "hydrocarbons". Aliphatic hydrocarbons are compounds whose molecules contain saturated single bonds (i.e., alkanes) or unsaturated double or triple bonds. Alkenes contain carbon–carbon double bonds and have a structural formula CnH2n. Unsaturated hydrocarbons containing carbon–carbon triple bonds are called "alkynes" and are structurally represented by the formula CnH2n-2.
The simplest alkyne is ethyne, or...
Nomenclature of Alkynes
Alkynes are unsaturated hydrocarbons characterized by the presence of carbon-carbon triple bonds and have a general formula CnH2n-2. The nomenclature of alkynes follows a set of rules similar to alkanes and alkenes; however, alkynes bear the suffix "-yne" instead of "-ane" or "-ene." There are two approaches to naming alkynes:
Hybridization of Atomic Orbitals II
sp3d and sp3d 2 Hybridization
Mass Spectrometry: Cycloalkene Fragmentation
The molecular ions of cycloalkenes undergo fragmentation via a retro-Diels–Alder reaction.
Thermal and Photochemical Electrocyclic Reactions: Overview
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

