Heteroatom Oxidation Controls Singlet-Triplet Energy Splitting in Singlet Fission Buildings Blocks

2022 ◽  
Author(s):  
J. Terence Blaskovits ◽  
Maria Fumanal ◽  
Sergi Vela ◽  
Yuri Cho ◽  
Clemence Corminboeuf
Keyword(s):  
Energy Splitting ◽  
Singlet Fission ◽  
Triplet Energy ◽  
Splitting Criterion

Singlet fission (SF) is a promising multiexciton-generating process. Its demanding energy splitting criterion - that the S1 energy must be at least twice that of T1 - has limited the...

Controlling the exciton lifetime of blue thermally activated delayed fluorescence emitters using a heteroatom-containing pyridoindole donor moiety

2017 ◽  
Vol 4 (4) ◽  
pp. 619-624 ◽  
Author(s):  
Gyeong Heon Kim ◽  
Raju Lampande ◽  
Joon Beom Im ◽  
Jung Min Lee ◽  
Ju Young Lee ◽  
...  
Keyword(s):  
Molecular Design ◽  
Delayed Fluorescence ◽  
Energy Splitting ◽  
Triplet Energy ◽  
High Quantum Efficiency ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Exciton Lifetime ◽  
Low Efficiency ◽  
Donor Moiety

We demonstrate a promising molecular design approach to achieve short exciton lifetime, small singlet and triplet energy splitting and high photoluminescence quantum yield in thermally activated delayed fluorescence emitters for high quantum efficiency and low efficiency roll-off characteristics in OLEDs.

Forcing dimethylacridine crooking to improve the efficiency of orange-red thermally activated delayed fluorescent emitters

2020 ◽  
Vol 8 (30) ◽  
pp. 10416-10421
Author(s):  
Feng-Yan Hao ◽  
Yi-Zhong Shi ◽  
Kai Wang ◽  
Xiao-Chun Fan ◽  
Lin Wu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Steric Hindrance ◽  
Fluorescence Quantum Yield ◽  
Energy Splitting ◽  
Triplet Energy ◽  
Thermally Activated ◽  
High Fluorescence ◽  
Planar Geometries ◽  
High Fluorescence Quantum Yield

By crooking conventional donor segments via suitable steric hindrance, nearly planar geometries, a small singlet–triplet energy splitting and a high fluorescence quantum yield can be realized simultaneously.

scholarly journals Revealing the contest between triplet-triplet exchange and triplet-triplet energy transfer coupling in correlated triplet pair states in singlet fission

2021 ◽  
Author(s):  
Vibin Abraham ◽  
Nicholas Mayhall
Keyword(s):  
Energy Transfer ◽  
Exchange Interaction ◽  
Entangled State ◽  
Separation Mechanism ◽  
Singlet Fission ◽  
Triplet Energy ◽  
Triplet Pair ◽  
Triplet Energy Transfer ◽  
State 1 ◽  
Pair State

Understanding the separation of the correlated triplet pair state 1(TT) intermediate is critical for leveraging singlet fission to improve solar cell efficiency. This separation mechanism is dominated by two key interactions: (i) the exchange interaction (K) between the triplets which leads to the spin splitting of the biexciton state into 1(TT),3(TT) and 5(TT) states, and (ii) the triplet-triplet energy transfer integral (t) which enables the formation of the spatially separated (but still spin entangled) state 1(T...T). We develop a simple ab initio technique to compute both the biexciton exchange (K) and biexciton transfer coupling. Our key findings reveal new conditions for successful correlated triplet pair state dissociation. The biexciton exchange interaction needs to be ferromagnetic or negligible to the triplet energy transfer for favourable dissociation. We also explore the effect of chromophore packing to reveal geometries where these conditions are achieved for tetracene.

Energetic Dependence of Triplet Energy Transfer to PbS Quantum Dots for Singlet-Fission Based Photo-multiplication

2019 ◽  
Author(s):  
Victor Gray ◽  
Jesse Allardice ◽  
Simon Dowland ◽  
Zhilong Zhang ◽  
James Xiao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Energy Transfer ◽  
Singlet Fission ◽  
Triplet Energy ◽  
Triplet Energy Transfer ◽  
Pbs Quantum Dots

Overcome energy loss of thermally activated delayed fluorescence sensitized-OLEDs by developing fluorescence dopant with a small singlet-triplet energy splitting

2022 ◽  
Author(s):  
XinYe Wang ◽  
YiFan Zhang ◽  
Ze Yu ◽  
Yuan Wu ◽  
Dongdong Wang ◽  
...  
Keyword(s):  
Energy Loss ◽  
State Energy ◽  
Radiative Transition ◽  
Delayed Fluorescence ◽  
Energy Splitting ◽  
Triplet Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

TADF-sensitizing-fluorescence (TSF) strategy suffered a disturbing energy loss causing by the T1 states of fluorescence dopant (FD) due to its low T1-state energy and forbidden of radiative transition. We supposed...

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