Enhanced Triplet–Triplet Annihilation of Blue Fluorescent Organic Light-Emitting Diodes by Generating Excitons in Trapped Charge-Free Regions
| Autor: | Jang-Joo Kim, Gyeong Seok Lee, Yun-Hi Kim, Hyoungcheol Lim, Mi-Kyung Kim, Hyung Jin Cheon |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Anthracene
Materials science Annihilation Exciton 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences chemistry.chemical_compound chemistry OLED Molecule General Materials Science Quantum efficiency 0210 nano-technology Diode |
| Zdroj: | ACS Applied Materials & Interfaces. 11:48121-48127 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.9b15303 |
| Popis: | Three new anthracene-cored molecules, 3,3'-(5-(10-(naphthalen-1-yl)anthracen-9-yl)-1,3-phenylene)dipyridine (AP3Py-Na), 3,3'-(5-(10-(naphthalen-2-yl)anthracen-9-yl)-1,3-phenylene)dipyridine (AP3Py-2Na), and 9,10-bis(3,5-di(pyridin-3-yl)phenyl)anthracene (ADP3Py), were synthesized to be used as an efficiency-enhancement layer (EEL) in blue fluorescent organic light-emitting diodes. Insertion of a very thin EEL (3 nm) between the deep blue emitting layer (EML) and the electron transport layer enhanced the external quantum efficiency (EQE) of the blue device by 44% compared to the device without the EEL, resulting in an EQE of 7.9% and a current efficiency of 9.0 cd A-1 at 1000 cd m-2; the CIE coordinates of the emitting color were (0.13, 0.14). The transient electroluminescence showed that the efficiency enhancement originates from the triplet-triplet annihilation (TTA) process in the EEL, followed by energy transfer to the emitting dye in the EML. |
| Databáze: | OpenAIRE |
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