New naphthyridine-based bipolar host materials for thermally activated delayed fluorescent organic light-emitting diodes

2019 ◽  
Vol 70 ◽  
pp. 55-62
Author(s):  
Tzu-Chin Yeh ◽  
Jhen-De Lee ◽  
Lu-Yu Chen ◽  
Tanmay Chatterjee ◽  
Wen-Yi Hung ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials

Spatially optimized quaternary phosphine oxide host materials for high-efficiency blue phosphorescence and thermally activated delayed fluorescence organic light-emitting diodes

2015 ◽  
Vol 3 (43) ◽  
pp. 11385-11396 ◽  
Author(s):  
Dongxue Ding ◽  
Zhen Zhang ◽  
Ying Wei ◽  
Pengfei Yan ◽  
Hui Xu
Keyword(s):  
Phosphine Oxide ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Spatial Optimization ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials

Spatial optimization of host materials for highly efficient blue organic light-emitting diodes was rationally performed on the basis of a series of ternary and quaternary phosphine oxide 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.

Effect of the molecular structure of the host materials on the lifetime of green thermally activated delayed fluorescent organic light-emitting diodes

2015 ◽  
Vol 3 (31) ◽  
pp. 8061-8065 ◽  
Author(s):  
Yirang Im ◽  
Wook Song ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Structure ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials

The effect of the molecular structure of the host materials on the efficiency and lifetime of the green thermally activated delayed fluorescent devices was studied using two dibenzothiophene derived host materials.

CN engineered electron transport type hosts for high efficiency and extended lifetime in blue thermally activated delayed fluorescent organic light-emitting diodes

2021 ◽  
Author(s):  
Sung Yong Byun ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Structure ◽  
Electron Transport ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Host Materials ◽  
Transport Type

Electron transport type host materials for blue thermally activated delayed fluorescent (TADF) organic light-emitting diodes (OLEDs) were synthesized by engineering the electron withdrawing CN units in the molecular structure. The...

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