Siloxy Group-Induced Highly Efficient Room Temperature Phosphorescence with Long Lifetime
| Autor: | Kunihiko Tajima, Keiko Kuwabara, Taku Hasobe, Masaki Nakatani, Yusuke Miyake, Ryosuke Shigitani, Hayato Sakai, Masaki Shimizu |
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| Rok vydání: | 2016 |
| Předmět: |
Intermolecular force
chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention General Energy chemistry law Intramolecular force Excited state Iridium Physical and Theoretical Chemistry 0210 nano-technology Luminescence Platinum Electron paramagnetic resonance Phosphorescence |
| Zdroj: | The Journal of Physical Chemistry C. 120:11631-11639 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The design and development of organic phosphors that exhibit efficient emission at room temperature but do not contain precious metals such as iridium and platinum have attracted increasing attention. We report herein highly efficient green phosphorescence-emitting 1,4-dibenzoyl-2,5-bis(siloxy)benzene crystals in air at room temperature. Remarkable luminescence quantum yields of 0.46 to 0.64 and long lifetimes ranging from 76.0 to 98.3 ms were observed. X-ray diffraction analysis of the single crystals revealed that there were several intermolecular interactions causing suppression of intramolecular motion, thereby minimizing nonradiative decay of the triplet excited state. Comparison with the corresponding 2,5-bis(dimethylphenylsilylmethyl) and 2,5-bis(trimethylsilyl) derivatives revealed that the siloxy groups are essential for efficient room temperature phosphorescence. Density functional calculations suggested that σ–n conjugation was operative in the siloxy moieties. Electron spin resonance measureme... |
| Databáze: | OpenAIRE |
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