A difluoroboron β-diketonate-based luminescent material with tunable solid-state emission and thermally activated delayed fluorescence

2020 ◽  
Vol 4 (1) ◽  
pp. 285-291 ◽  
Author(s):  
Han Zhang ◽  
Peng-Zhong Chen ◽  
Li-Ya Niu ◽  
Qing-Zheng Yang
Keyword(s):  
Solid State ◽  
Delayed Fluorescence ◽  
Luminescent Material ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
State Luminescence

We report a solid luminescent material based on difluoroboron β-diketonate manifesting tunable solid-state luminescence and thermally activated delayed fluorescence.

scholarly journals Direct observation of intersystem crossing in a thermally activated delayed fluorescence copper complex in the solid state

2016 ◽  
Vol 2 (1) ◽  
pp. e1500889 ◽  
Author(s):  
Larissa Bergmann ◽  
Gordon J. Hedley ◽  
Thomas Baumann ◽  
Stefan Bräse ◽  
Ifor D. W. Samuel
Keyword(s):  
Solid State ◽  
Delayed Fluorescence ◽  
Average Lifetime ◽  
Intersystem Crossing ◽  
Time Resolved ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Singlet States ◽  
Time Resolved Photoluminescence

Intersystem crossing in thermally activated delayed fluorescence (TADF) materials is an important process that controls the rate at which singlet states convert to triplets; however, measuring this directly in TADF materials is difficult. TADF is a significant emerging technology that enables the harvesting of triplets as well as singlet excited states for emission in organic light emitting diodes. We have observed the picosecond time-resolved photoluminescence of a highly luminescent, neutral copper(I) complex in the solid state that shows TADF. The time constant of intersystem crossing is measured to be 27 picoseconds. Subsequent overall reverse intersystem crossing is slow, leading to population equilibration and TADF with an average lifetime of 11.5 microseconds. These first measurements of intersystem crossing in the solid state in this class of mononuclear copper(I) complexes give a better understanding of the excited-state processes and mechanisms that ensure efficient TADF.

Bright bluish-green emitting Cu(i) complexes exhibiting efficient thermally activated delayed fluorescence

2021 ◽  
Vol 50 (15) ◽  
pp. 5171-5176
Author(s):  
Chun-Hua Huang ◽  
Mingxue Yang ◽  
Xu-Lin Chen ◽  
Can-Zhong Lu
Keyword(s):  
Solid State ◽  
Quantum Yield ◽  
Delayed Fluorescence ◽  
High Quantum Yield ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
High Quantum ◽  
Bluish Green

Three strongly emissive Cu(i) complexes exhibiting bright bluish-green thermally activated delayed fluorescence in the solid state with high quantum yield up to 91% were synthesized and characterized.

Design of Thermally Activated Delayed Fluorescence Emitters for Organic Solid-State Microlasers

2021 ◽  
Author(s):  
Hongbing Fu ◽  
Shuai Li ◽  
Xue Jin ◽  
Zhenyi Yu ◽  
Xiaoxiao Xiao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Solid State ◽  
Energy Gap ◽  
Delayed Fluorescence ◽  
Triplet States ◽  
Small Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Organic Solid ◽  
Singlet And Triplet States

Small energy gap between charge transfer (CT) singlet and triplet states enables thermally activated delayed fluorescence (TADF). Nevertheless, the small oscillator strength associated with CT states and their long exciton...

scholarly journals The role of solid state solvation on the charge transfer state of a thermally activated delayed fluorescence emitter

2017 ◽  
Vol 5 (42) ◽  
pp. 11001-11009 ◽  
Author(s):  
T. Northey ◽  
J. Stacey ◽  
T. J. Penfold
Keyword(s):  
Solid State ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Device Properties ◽  
Transfer State

Solid state solvation, crucial for understanding the device properties of 3rd generation organic light emitting diodes (OLEDs) based upon thermally activated delayed fluorescence (TADF), is investigated using molecular dynamics and quantum chemistry.

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