Mixed-host engineering of blue thermally activated delayed fluorescence devices for enhanced efficiency and suppressed efficiency roll-off
| Autor: | Soo Jong Park, Young Wook Park, Byeong Kwon Ju, Kwang Wook Choi |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Dopant Organic Chemistry Oxide Ether 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Inorganic Chemistry Maximum efficiency chemistry.chemical_compound chemistry OLED Quantum efficiency Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Spectroscopy Diode |
| Zdroj: | Optical Materials. 113:110879 |
| ISSN: | 0925-3467 |
| DOI: | 10.1016/j.optmat.2021.110879 |
| Popis: | Blue thermally activated delayed fluorescence (TADF) organic light-emitting diodes (OLEDs) with enhanced efficiency and suppressed efficiency roll-offs were fabricated using a mixed host consisting of 3,3-di(9H-carbazol-9-yl)-biphenyl (mCBP) and bis[2-(diphenyl-phosphino)phenyl]ether oxide (DPEPO). Notably, mCBP and DPEPO, which are generally used as hosts in blue TADF OLEDs, exhibit material stability and efficiency as their trade-off characteristics. The mixed-host structure, when applied to 10,10′-(4,4′-sulfonylbis(4,1-phenylene))bis(9,9-dimethyl-9,10-dihydroacridine), which is a blue TADF dopant, facilitated a maximum efficiency of 18.1%. Furthermore, the critical current density (J0), at which the external quantum efficiency decreases by half of its maximum value, was observed to be 3.9 times that of the DPEPO device. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect