Triplet harvesting in luminescent Cu(I) complexes by the thermally activated luminescence transition mechanism: impact of the molecular structure

Triplet harvesting in luminescent Cu(I) complexes by the thermally activated luminescence transition mechanism: impact of the molecular structure
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通过热激活发光跃迁机制在发光 Cu(I) 配合物中收获三重态:分子结构的影响

DOI:
10.1039/c7tc00773f
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发表时间:
2017-05
影响因子:
6.4
通讯作者:
Xu S. J.
Xu S. J.
中科院分区:
材料科学2区
文献类型:
--
作者:
Su Z. C.;Zheng C. C.;Cheng G.;Che C. -M.;Xu S. J.

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采用变温时间积分和时间分辨光致发光测量以及模型分析方法,对两种铜(I)发光配合物从普通磷光到延迟荧光的热诱导跃迁进行了全面研究。强有力地证明了分子结构对激子从最低激发三重态到具有更高能量的单重态的转移的显著影响。此外,几个基本的生物物理过程,包括三重态本地化,三重态收获,和反向系统间交叉探索使用理论模型。定量地解释了发射强度的温度依赖性异常。拉曼光谱表征和电子振动发射跃迁的理论计算表明,分子的热振动在荧光过程中起着至关重要的作用。
Thermally induced transition from ordinary phosphorescence to delayed fluorescence in two kinds of luminescent copper(I) complexes is comprehensively investigated by using variable-temperature time-integrated and time-resolved photoluminescence measurements as well as model analysis. A pronounced impact of the molecular structure on exciton transfer from the lowest excited triplet spin states to the singlet spin states with higher energy is firmly demonstrated. Moreover, several fundamental photophysical processes including triplet localization, triplet harvesting, and reverse intersystem crossing are explored using theoretical models. Temperature dependence abnormalities of the emission intensity are quantitatively interpreted. Raman spectral characterization and theoretical calculations of vibronic emission transitions reveal that the molecules' thermal vibrations play an essential role in the fluorescence process.
具有部分原子有序性的 GaInP 合金中辐射复合通道从离域态到局域态的转变:莫特跃迁的直接光学特征?
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