Quinolyl functionalized spiro[fluorene-9,9′-xanthene] host materials with bipolar characteristics for green and red phosphorescent organic light-emitting diodes
| Autor: | Matthew J. Jurow, Yi Liu, Xiang-Hua Zhao, Yi Zhao, Qi-Jian Zhang, Ming-Li Sun, Zhensong Zhang, Dao-Kun Zhong, Yaguang Sun, Bao-Yi Ren |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Xanthene
Quinoline 02 engineering and technology General Chemistry Fluorene 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Biomaterials chemistry.chemical_compound chemistry law Materials Chemistry OLED Phosphorescent organic light-emitting diode Molecular orbital Electrical and Electronic Engineering 0210 nano-technology Phosphorescence HOMO/LUMO |
| Zdroj: | Organic Electronics. 36:140-147 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2016.06.006 |
| Popis: | Spiro[fluorene-9,9′-xanthene] (SFX) bipolar hosts bearing one, two and three quinolyl substituents, namely SFX-bPy, SFX-DbPy and SFX-TbPy, were designed and synthesized for phosphorescent organic light emitting diodes (PhOLEDs). The successive substitution of quinoline at 2′, 2 and 7′ positions of SFX results in reduced LUMO energy levels while leaving the HOMO energy levels nearly intact. The impact of quinoline substitution in these SFX-based hosts on PhOLED performance was investigated in detail through green and red model devices. For the green emitting devices, the device based on SFX-bPy host showed better performance (23.6 cd A−1, 23.4 lm W−1, 6.3%) due to high triplet energy level (T1) and balanced carriers-transporting ability. In contrast, for the red PhOLED devices, the device hosted by SFX-DbPy displayed higher performance (15.8 cd A−1, 16.0 lm W−1, 9.1%), attributable to the well matched T1 and separated frontier molecular orbitals. This work thus sheds light on the rational design of SFX-based bipolar hosts for more efficient PhOLEDs. |
| Databáze: | OpenAIRE |
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