Thermally activated delayed fluorescence host materials based on triphenylphosphine oxide derivatives

2019 ◽  
Vol 685 (1) ◽  
pp. 71-77
Author(s):  
Dong Ho Choi ◽  
Young Sik Kim
Keyword(s):  
Triphenylphosphine Oxide ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Host Materials

Solution processible triphenylphosphine-oxide-cored dendritic hosts featuring thermally activated delayed fluorescence for power-efficient blue electrophosphorescent devices

2019 ◽  
Vol 7 (32) ◽  
pp. 9850-9855 ◽  
Author(s):  
Mingming Zhang ◽  
Liang Chen ◽  
Xiushang Xu ◽  
Lei Zhao ◽  
Shumeng Wang ◽  
...  
Keyword(s):  
Phosphine Oxide ◽  
Triphenylphosphine Oxide ◽  
Delayed Fluorescence ◽  
Device Performance ◽  
Thermally Activated Delayed Fluorescence ◽  
Power Efficient ◽  
Thermally Activated ◽  
New Hosts

A series of phosphine oxide based dendritic hosts have been developed. Compare with conventional dendritic host H2, the new hosts not only maintain high T1 but also have a small ΔEST and bring higher device performance.

scholarly journals Novel hyperbranched polymers as host materials for green thermally activated delayed fluorescence OLEDs

2017 ◽  
Vol 35 (4) ◽  
pp. 490-502 ◽  
Author(s):  
Ling-yun Zhao ◽  
Ya-nan Liu ◽  
Shi-fan Wang ◽  
You-tian Tao ◽  
Fang-fang Wang ◽  
...  
Keyword(s):  
Hyperbranched Polymers ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Host Materials

Noble Dibenzothiophene-Based Bipolar Hosts for Blue Organic Light-Emitting Diodes Using Thermally Activated Delayed Fluorescence

2020 ◽  
Vol 20 (11) ◽  
pp. 7191-7195
Author(s):  
JaMin Lee ◽  
Sae Won Lee ◽  
Young Sik Kim
Keyword(s):  
Dft Calculations ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials ◽  
Td Dft

Novel thermally activated delayed fluorescence (TADF) host materials for blue electrophosphores-cence were designed by combining the electron acceptor dibenzothiophene (DBT) unit and the electron donor acridine derivatives into a single molecular unit by density functional theory (DFT). Depending on the optimal charge transfer, DFT and time-dependent DFT (TD-DFT) calculations for the ground state were performed to obtain the energy of the singlet (S1) and triplet (T1) excited states of the TADF material for Hartree-Fock percentage of TD-DFT. The sufficiently large separation between the HOMO and LUMO resulted in a small difference in energy (ΔEST) between the S1 and T1 states using DFT and TD-DFT calculations. The host molecules retained high triplet energy and showed great potential for use in blue organic light-emitting diodes (OLED). The results showed that these molecules are a good TADF host materials because they have a low barrier to hole and electron injection with a balanced charge transporting property for both holes and electrons, and a small ΔEST.

Highly Charge Transport Thermally Activated Delayed Fluorescence Host Materials Based on Benzimidazole-Acridine Derivatives

2020 ◽  
Vol 20 (8) ◽  
pp. 5070-5074
Author(s):  
Ja Min Lee ◽  
Sae Won Lee ◽  
Young Sik Kim
Keyword(s):  
Dft Calculations ◽  
Charge Transport ◽  
Density Functional ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Host Molecules ◽  
Acridine Derivatives ◽  
Host Materials ◽  
Td Dft

We designed novel thermally activated delayed fluorescence (TADF) host molecules for blue electrophosphorescence by combining the electron acceptor benzimidazole (BI) unit and the electron donor acridine derivatives into a single molecular unit based on density functional theory (DFT). We obtained the energies of the first singlet (S1) and the first triplet (T1) excited states of the TADF materials by performing DFT and time-dependent DFT (TD-DFT) calculations to the ground state using dependence on charge transfer amounts for the optimal Hartree-Fock percentage in the exchange-correlation of TD-DFT. Using DFT and TD-DFT calculations, the large separation between the HOMO and LUMO caused a small difference in energy (ΔEST) between the S1 and T1 states. The host molecules retained high triplet energy and showed great potential for use in blue phosphorescent organic light-emitting diodes. The results showed that these molecules are promising TADF host materials because they have a low barrier to hole and electron injection, balanced charge transport for both holes and electrons, and a small ΔEST.

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