Correlation between the PL and EL emissions of polyfluorene-based diodes using bilayers or polymer blends

Influence of SiO2/TiO2 Nanocomposite on the Optoelectronic Properties of PFO/MEH-PPV-Based OLED Devices

“…Such significant differences in fluorescence and EL spectra for hybrids of polyfluorene derivatives have been reported [9,36,37]. Moreover, the significant difference between the fluorescence and EL spectra was strong evidence that Förster resonance energy transfer (FRET) was not the only mechanism occurring in the OLED devices during the EL measurements [5]. Whilst fluorescence spectra are created via various types of energy transfer processes or direct excitation, the EL spectra strongly depend on additional factors such as charge transport, charge injection from the electrodes, recombination processes and exciton generation.…”

“…Examples of these advantages are low operating voltage, low cost of fabrication, ease of processing and manufacturing, flexibility, capability to build devices with large-area and good solubility in common organic solvents and photothermal stability [1,2,3,4]. OLEDs with various colors can be achieved by several techniques, such as: (i) building bilayers in a tandem diode structure [5,6]; (ii) using a single polymer with multiple functional groups [7,8]; (iii) blending of conjugated polymers [9,10]; (iv) mixing polymers with nanostructured materials [11,12], quantum dots [13,14] and small phosphorescent [15,16] or fluorescent [8,17] molecules.…”

Optical properties of nanowires based on a blend of poly (9,9-dioctylfluorene) [PFO] and poly(9,9-dioctyl fluorene-alt-benzothiadiazole) [F8BT]

“…Such blends have been used in efficient organic light emitting diodes (LEDs). Here, the combination of phase-separated materials can be used to both increase the PL quantum efficiency and balance electron and hole mobilities [21,22]. For this reason PFO:F8BT nanowires are of potential interest as building blocks for new organic optoelectronic technologies, such as nanoscale organic light emitting diodes.…”

Magnetic properties of a polyfluorene derivative containing complexed neodymium ions

“…The electronic properties of semiconducting conjugated polymers continue to occupy a place of strong interest either in academic or technological fields of research, due to their multipurpose applications such as, LEDs, solar cells, and sensors to cite just a few. This class of polymers may also play a role as magnetic materials, because in nanoscale, they are of particular interest due to the growing production of high‐speed computers and high‐density storage devices, as hard disks .…”

“…However, some drawbacks of those approaches still have to be overcome, mainly the poor solubility in common organic solvents, making it difficult the necessary film formation for the processing. To the best of our knowledge, the use of fluorene‐ derived copolymers was not yet explored as magnetic materials, especially when combined with appropriated sites for complexation with metallic ions, such as terpyridine. Additionally, these materials present important solubility properties in organic solvents, with ability of film formation by usual techniques, such as casting and jet printing and advantageous mechanical properties, turning them especially attractive for technological applications.…”