LUMINESCENCE ENHANCEMENT OF OLED PERFORMANCE BY DOPING COLLOIDAL MAGNETIC FE₃O₄ NANOPARTICLES

Abstract

Abstract-We report synthesis of magnetic Fe 3 O 4 nanoparticles (MNPs) based on two phase method and their application in organic light-emitting devices (OLEDs) as blend with emissive Polyfluorene (PFO) matrix. Two phase method allows to successively synthesizing oleic acid capped MPNs with 5-10 nm particle size. Colloidal MNPs can be easily mixed with emissive polymer solutions to obtain a blend for OLED application. The electroluminescence efficiency increases by doping with MNPs into emissive layer. Different dopant concentrations varied from 0,4% to 2% were monitored. It was observed that the electroluminescence increases up to 1% w/v doping ratio. The luminance of OLEDs increased from 15.000 cd/m 2 to 24.000 cd/m 2 in comparison pristine device with 1% MNP doped device.

Solubilization, dispersion and stabilization of magnetic nanoparticles in water and non-aqueous solvents: recent trends

“…Due to its long hydrophobic tail, colloidal Fe 3 O 4 NPs prepared using oleic acid are highly soluble in organic solvents, such as toluene, hexane, chloroform, etc. 83 Among a host of MNPs with functionalizing agents, dopamine (DA)-coated superparamagnetic iron oxide nanoparticles (SPIONs, Fe 3 O 4 @DA) were synthesized using a one-step process by a modied coprecipitation method, and then 2-3 nm gold nanoparticles were easily conjugated to Fe 3 O 4 @DA nanoparticles by the electrostatic force between the gold nanoparticles and the amino groups of dopamine, to afford watersoluble Au-Fe 3 O 4 hybrid nanoparticles (Fig. 5).…”

Simulation Research on Magnetoacoustic Concentration Tomography With Magnetic Induction Based on Uniaxial Anisotropy of Magnetic Nanoparticles

“…Consider that an MNP composed of a superparamagnetic material, including a core responsible for its magnetic behavior and a magnetically neutral coating that prevents agglomeration of the MNPs [28,29]. Neglecting the anisotropy of MNPs, the static magnetization curve of MNPs with isotropy can be represented by Langevin function L(α) as indicated in Figure 2.…”

Synthesis of iron oxide nanoparticles in a continuous flow spiral microreactor and Corning® advanced flow™ reactor

“…Electron spin resonance (ESR) techniques were used to detect unpaired electrons and identify the magnetic characteristics as well as the purity of iron oxide NPs samples [63]. The ESR technique is also called as the electron paramagnetic resonance and the analysis works by two ways of without an external magnetic field (the internal electron spins randomly) and with applied external magnetic field where unpaired electron spins are arranged in parallel or anti-parallel, which then separate into two energy levels (E1 and E2).…”