3 years ago

Self-Assembling Azaindole Organogel for Organic Light-Emitting Devices (OLEDs)

Self-Assembling Azaindole Organogel for Organic Light-Emitting Devices (OLEDs)
Gustavo de Miguel, Eva M. García-Frutos, Johan Hofkens, Mark Van der Auweraer, Cristina Martín, Koen Kennes
This study reports on the use of a self-assembling organogel, 5-(4-nonylphenyl)-7-azaindole (1), as a new emitter in small-molecule organic light emitting devices (OLEDs). The theoretical calculations along with the photophysical characterization studies suggest the coexistence of the monomer and dimer species at high concentration of compound 1. The presence of this type of dimer (formed via H-bonding) is responsible for the increased emission. However, the most notable feature is the 3D network of vastly interconnected fibers formed in the organogel that modifies the photophysical properties. Based on this, several OLED architectures are made in order to understand the mechanism involved in the electroluminescence (EL) behavior of 1. Although the position of the EL spectra differs from that of the photoluminescence (PL) spectra, the trends observed in the device properties perfectly match with dimer formation. In this framework a better device performance is associated to a higher efficiency of dimer formation, which optimizes in the OLED prepared from the organogel. Therefore, these results show that the rational combination of a moiety showing a strong PL intensity increased upon aggregation with organogel properties is an efficient strategy to create alternative emitters for OLED devices. A new emitter based on a self-assembled organogel, 5-(4-nonylphenyl)-7-azaindole, is proposed and tested for organic light emitting device (OLED) applications. The theoretical calculations along with the photo-electroluminescent characterization unravel the mechanism involved in the electroluminescence behavior and also point out that this kind of self-assembling molecule is an efficient strategy to create alternative emitters for OLED devices.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adfm.201702176

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