| Autor: |
Rai-Shung Liu, Hao-Chun Li, Yi-Ming Cheng, Pi-Tai Chou, Yao-Ping Lin |
| Rok vydání: |
2007 |
| Předmět: |
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| Zdroj: |
Advanced Functional Materials. 17:520-530 |
| ISSN: |
1616-301X |
| DOI: |
10.1002/adfm.200600187 |
| Popis: |
New fluoro derivatives of Ph 2 N-containing (Ph: phenyl) oligo(arylenevinylene) derivatives are prepared by using double Heck-coupling reactions or Horner-Wadsworth-Emmons reactions. These oligomers are highly fluorescent (fluorescence quantum yields Φ = 0.93-0.68) with emissions in a broad wavelength region (448-579 nm), depending on the position of the fluoro substituents. The highest occupied and lowest unoccupied molecular orbital (HOMO-LUMO) energy levels of these oligomers are characterized by electrochemistry and UV spectroscopy. The effects of the fluoro substituents on the energy levels are rationalized with HOMO-LUMO simulations. In a classical organic light emitting diode (OLED), one representative (5a) shows a remarkable external quantum efficiency value (η ext = 4.87 %) at J=20 mA cm -2 ; the maximum brightness at 10.2 V is 22506 cd m -2 (λ=458 nm; Commission Internationale de l'Eclairage (CIE) coordinates x=0.14, y = 0.14) with a full width at half-maximum of 54 nm, demonstrating the superiority of these fluoro-containing oligomers in OLED devices. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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