Orange electrophosphorescence based on bis(3,5-dimethylphenyl)pyridine iridium (III) complexes for non-halogenated solution processable phosphorescent organic light-emitting diodes
| Autor: | Kyoung Soo Yook, Jaeyoung Hwang, Soon-Ki Kwon, Yun-Hi Kim, Seung-Bae Ji, Hyungjin Cheon |
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| Rok vydání: | 2018 |
| Předmět: |
Photoluminescence
Ligand Process Chemistry and Technology General Chemical Engineering chemistry.chemical_element 02 engineering and technology Orange (colour) 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Pyridine Polymer chemistry OLED Iridium 0210 nano-technology Phosphorescence HOMO/LUMO |
| Zdroj: | Dyes and Pigments. 149:719-727 |
| ISSN: | 0143-7208 |
| DOI: | 10.1016/j.dyepig.2017.11.029 |
| Popis: | Two heteroleptic iridium complexes, (dmppy)2Ir(tmd) and (dmppy)2Ir(acac), which consist of phenylpyridin (ppy) as main ligand with dimethyl substituents on both the phenyl ring and the pyridine ring, and heptanedione (tmd) and acetyl acetonate (acac) as ancillary ligands were synthesized and characterized regarding their suitability as orange organic light-emitting diodes (OLEDs). The photoluminescence (PL) of (dmppy)2Ir(tmd) and (dmppy)2Ir(acac) produced orange emissions with maximum emission peaks at 577 and 570 nm, respectively. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital energy (LUMO) levels of (dmppy)2Ir(tmd) and (dmppy)2Ir(acac) were −5.03/-2.83 and −5.02/-2.77 eV, respectively. An optimized non-halogenated solution-processed (dmppy)2Ir(tmd) device showed a high current efficiency of 52.7 cd/A and exhibits an efficiency of 89% when compared to a vacuum-deposited device that showed 66.7 cd/A at 1000 cd/m2. |
| Databáze: | OpenAIRE |
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