Plasmonically Enhanced Optical Characteristics From Europium Organometallic Complex

Abstract

We demonstrated that the plasmonic effect can enhance the photoluminescence of the europium organometallic complex in conventional organic light emitting diodes stack from an anode to emissive layer with solution processing. The aggregated gold nanoparticles (A-Au NPs) were incorporated in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) layer to increase the luminescent quantum efficiency of the emissive layer. An enhancement of 31% was achieved in the emission intensity at 614 nm for samples with A-Au NPs. The reduced exciton lifetime measured by time-resolved photoluminescence comply with the Purcell effect. These improvements are attributed to the localized surface plasmon of A-Au NPs increasing the electric dipole transition rate from Eu 3+ ions.Index Terms-Europium, photoluminescence, plasmons, rare earth metals.

Photophysical studies of highly luminescent europium(III) and terbium(III) complexes functionalized with amino and mercapto groups

“…The interaction of functionalized-lanthanide complexes with silver or gold nanoparticles is interesting because the possibility of their emission intensity enhancement that may happen due to the interaction with the surface plasmon resonance of these nanoparticles [7]. Kim and coworkers [12] described the increase of the emission intensity of the [Eu(dbm) 3 (phen)] complex in an electroluminescent device by gold incorporation in the neighbor layer. The presence of amino (-NH 2 ) functional groups is also useful to covalently bond lanthanide(III) complexes to silica networks as shown by Yan and Wang [11] and Zhang and co-workers [10].…”

Effects of Gold-Nanoparticle Surface and Vertical Coverage by Conducting Polymer between Indium Tin Oxide and the Hole Transport Layer on Organic Light-Emitting Diodes

“…Moreover, the surface coverage can be categorized in two ways: Surface coverage without PEDOT:PSS is simply a two-dimensional distribution on the ITO, while that with PEDOT:PSS is a three-dimensional distribution (a small number of stacked layers) within the PEDOT:PSS due to the aggregation of the Au-NPs. 7,8,11,12 Hence, both the PE-DOT:PSS thickness and the Au-NP size are quite critical as regards both the surface and vertical coverage, which ultimately affect the device performance.…”

“…19 To investigate the effects of surface coverage and lateral distribution on the device performance, 10-nm Au-NPs were selected and enclosed in the PEDOT:PSS, in which the Au-NPs were readily aggregated. 7,8,11,12,15 Thus, a small number of diversely formed stacked layers were created in the PEDOT:PSS, according to the specific device configurations given above. The location of the deposited Au-NPs was determined by the stacking order of the device structure.…”

“…An increase in the Au-NP loading amount is generally accompanied by an increase in the degree of particle aggregation in the PEDOT:PSS, due to electrostatic interaction between each NP and the PE-DOT:PSS. 7,8,11,12,15 This aggregated Au-NP formation can interrupt the hole transport and transmute the SPR effect. .…”

“…As the Au-NP size increased, a red-shift was induced in the UV spectra. [4][5][6][7][8]14,15 In Figure S6(b), the EL intensities of the examined devices were slightly enhanced at approximately 570 nm as the Au-NP size increased. The EL intensities at approximately 570 nm of the devices with small To understand the different current density and luminance behaviors exhibited by the examined devices, extinction crosssectional spectral models were simulated using the finitedifference time-domain (FDTD) method for each of the different device structures.…”