Triplet–Triplet Annihilation in 9,10-Diphenylanthracene Derivatives: The Role of Intersystem Crossing and Exciton Diffusion
| Autor: | Povilas Adomėnas, Vygintas Jankauskas, Saulius Juršėnas, Karolis Kazlauskas, Regimantas Komskis, Tomas Serevičius, Ona Adomėnienė, Andrew P. Monkman, Arunas Miasojedovas, Gediminas Kreiza, Vygintas Jankus |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Anthracene
education.field_of_study Annihilation Exciton Population 9 10-Diphenylanthracene 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Photochemistry 01 natural sciences Fluorescence 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound General Energy Intersystem crossing chemistry OLED Physical and Theoretical Chemistry 0210 nano-technology education |
| Zdroj: | The Journal of Physical Chemistry C. 121:8515-8524 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/acs.jpcc.7b01336 |
| Popis: | Triplet–triplet annihilation (TTA) is an attractive way to boost the efficiency of conventional fluorescent organic light-emitting diodes (OLEDs). TTA-active anthracene derivatives are often considered as state-of-the-art emitters due to the proper energy level alignment. In this work, TTA properties of a series of highly fluorescent nonsymmetrical anthracene compounds bearing 9-(4-arylphenyl) moiety and 10-(4-hexylphenyl) fragments were assessed. Two different methods to enhance the TTA efficiency are demonstrated. First, the intensity of TTA-based delayed fluorescence directly depended on the intersystem crossing (ISC) rate. This ISC rate can be significantly enhanced in more conjugated compounds due to the resonant alignment of S1 and T2 energy levels. While enhanced ISC rate slightly quenches the intensity of prompt fluorescence, the rise of the triplet population boosts the intensity of resultant delayed fluorescence. Second, the triplet annihilation rate can be significantly enhanced by optimization... |
| Databáze: | OpenAIRE |
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