scholarly journals Exciton-exciton annihilation in molecular aggregations

2021 ◽  
Vol 70 (4) ◽  
pp. 047302-047302
Author(s):  
Mao Jiang-Qi ◽  
◽  
Fan Xu-Yang ◽  
Lu Yan-Zhen ◽  
Wang Lu-Xia ◽  
...  
Keyword(s):  
Exciton Annihilation

Observation of Rapid Exciton–Exciton Annihilation in Monolayer Molybdenum Disulfide

Nano Letters ◽  
2014 ◽  
Vol 14 (10) ◽  
pp. 5625-5629 ◽  
Author(s):  
Dezheng Sun ◽  
Yi Rao ◽  
Georg A. Reider ◽  
Gugang Chen ◽  
Yumeng You ◽  
...  
Keyword(s):  
Molybdenum Disulfide ◽  
Exciton Annihilation

scholarly journals Ultrafast Exciton Dynamics in Two Dimensional Covalent Organic Frameworks Reveals Size Dependence to Exciton Diffusion

2020 ◽  
Author(s):  
Nathan C. Flanders ◽  
Matthew S. Kirschner ◽  
Pyosang Kim ◽  
Thomas Fauvell ◽  
Austin Evans ◽  
...  
Keyword(s):  
High Performance ◽  
Transient Absorption ◽  
Domain Size ◽  
Spectroscopic Techniques ◽  
Two Dimensional ◽  
Exciton Dynamics ◽  
Singlet Exciton ◽  
Exciton Diffusion ◽  
Absorption Studies ◽  
Exciton Annihilation

<p>Large singlet exciton diffusion lengths are a hallmark of high performance in organic based devices such as photovoltaics, chemical sensors, and photodetectors. In this study, exciton dynamics of a two-dimensional covalent organic framework, COF- 5, is investigated using ultrafast spectroscopic techniques. Following photoexcitation, the COF-5 exciton decays via three pathways: 1) excimer formation (4 ± 2 ps), 2) excimer relaxation (160 ± 40 ps), and 3) excimer decay (>3 ns). Excitation fluence-dependent transient absorption studies suggest that COF-5 has a relatively large diffusion coefficient (0.08 cm2/s). Furthermore, exciton-exciton annihilation processes are characterized as a function of COF-5 crystallite domain size in four different samples, which reveal domain- size dependent exciton diffusion kinetics. These results reveal that exciton diffusion in COF-5 is constrained by its crystalline domain size. These insights indicate the outstanding promise of delocalized excitonic processes available in 2D COFs, which motivate their continued design and implementation into optoelectronic devices. </p>

A high fluorescence rate is key for stable blue organic light-emitting diodes

2018 ◽  
Vol 6 (29) ◽  
pp. 7728-7733 ◽  
Author(s):  
Zhusen Liu ◽  
Fangyi Cao ◽  
Taiju Tsuboi ◽  
Yan Yue ◽  
Chao Deng ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Critical Factor ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Singlet Exciton ◽  
Thermally Activated ◽  
Organic Light ◽  
Exciton Annihilation ◽  
High Fluorescence

Singlet–singlet exciton annihilation (SSA) is found to be a critical factor for the decomposition of blue thermally activated delayed fluorescence (TADF) emitters in organic light-emitting diodes (OLEDs).

Exciton energy transfer and bi-exciton annihilation in the emitting layers of thermally activated delayed fluorescence-based OLEDs

2021 ◽  
Author(s):  
Hyunchul Kang ◽  
Han-Jin Ahn ◽  
Gyeong-Woo Kim ◽  
Ji-Eun Jeong ◽  
Han Young Woo ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Exciton Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Exciton Annihilation

Understanding the exciton energy transfer and bi-exciton annihilation processes in the emitting layers (EMLs) of thermally activated delayed fluorescence (TADF)-based organic light-emitting diodes (OLEDs) is essential for improving their internal...

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