Thin copolymer-cased light-emitting display made with fluorine-foped tin oxide substrates

Lessmann, Rudolf; Hümmelgen, Ivo A.

doi:10.1590/s1516-14392004000300015

Cited by 10 publications

(3 citation statements)

References 24 publications

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“…PEDOT:PSS supplied by Sigma-Aldrich, which is known to have a work function of approximately 5.2 eV, was used as the hole transport layer -HTL. The PEDOT:PSS solution was deposited by spin-coating at 1,800 rpm for 35 seconds and the films thus formed were thermally annealed at 373K for 10 minutes (13). The emissive polymeric layer (EL) comprised by the blend of poly[(1,4-phenylene)-alt-2,7(9,9-dioctylfluorene)] and an europium complex was deposited under the same conditions of PEDOT:PSS, but it was thermally annealed at 328K for 60 minutes.…”

Section: Assembly Of P-oleds Devicesmentioning

confidence: 99%

Influence of the Transparent Conductive Oxides on the P-OLEDs Behavior

et al. 2012

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Multilayer polymer-organic light emitting diodes (P-OLEDs) were assembled with different transparent conductive oxide (TCO) and aluminum as the anode and cathode, respectively. Two types of TCOs, ITO (indium tin oxide) or FTO (fluorine tin oxide), with different sheet resistances, from 10 to 61 Ω/□, were used. A blend of poly[(1,4-phenylene)-alt-2,7(9,9-dioctylfluorene)] and an europium complex (20 %) was used as the polymeric photoactive layer of the devices. The performance of P-OLEDs showed that those having the FTO film with the lowest sheet resistance presented the lowest threshold voltage, while those having the ITO with the lowest sheet resistance presented the highest luminance among all types of devices obtained.

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Section: Assembly Of P-oleds Devicesmentioning

confidence: 99%

Influence of the Transparent Conductive Oxides on the P-OLEDs Behavior

et al. 2012

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“…Alq 3 is a green emitter with photoluminescence observed in the range of 520 nm. Its emission occurs due to the transition from the highest occupied molecular orbit (HOMO), lying mainly on the phenoxide ring, to the lowest unoccupied molecular orbit (LUMO) located on the pyridyl ring (Lessmann and Hummelgen 2004). In Alq 3 , the optical transition responsible for PL is centred on the organic ligand, and the luminescent properties of this compound are mainly associated with the metal (Al)-nitrogen bond (Halls and Schlegel 2001).…”

Section: Introductionmentioning

confidence: 99%

Optical and morphological properties of ZnO and Alq3 incorporated polymeric thin layers fabricated by the dip-coating method

et al. 2022

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In this report, we present the influence of polymer matrix on morphological and optical properties of thin films containing zinc oxide (ZnO), tris(8-hydroxyquinolinato)aluminium (Alq3) and ZnO:Alq3. Polyvinylpyrrolidone (PVP) and poly(methyl methacrylate) (PMMA) dissolved in isopropanol and tetrahydrofuran, respectively, were used as polymeric matrices of fabricated composites. The analysed thin layers were deposited on Si substrates using a dip-coating method and characterized by Fourier-Transform Infrared Spectroscopy (FTIR), Energy-Dispersive X-ray spectroscopy (EDX), Atomic Force Microscopy (AFM), Scanning Electron Microscopy (SEM), Spectroscopic Ellipsometry (SE) and photoluminescence (PL). It was found that adding the polymer to Alq3 causes a blueshift in absorption compared to pure Alq3 layers. We also observed photoluminescence in the region of 2.2–2.8 eV for ZnO:Alq3:PMMA and ZnO:Alq3:PVP, as well as for Alq3:PMMA at room temperature. PL measurements showed that adding ZnO to Alq3:polymer matrix did not result in any shift in PL spectra compared to the results of Alq3:polymer layer. AFM and SEM measurements show that relatively smooth films were obtained in the case of composites based on PVP and PMMA. Moreover, a change in the size of ZnO agglomerates depending on polymer used is observed for the three-component layers. We also noticed that the values of the refractive index are higher for the samples in the PVP matrix. However, the opposite behaviour was observed in the case of the extinction coefficient.

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“…Also, the WE consists of TCO substrate and semiconductor oxide of TiO 2 , and dye coated on the TiO 2 particles, where the TCO substrate includes indium tin oxide (ITO), fluorine doped tin oxide (FTO), aluminum doped zinc oxide (AZO), etc., and the FTO is used most frequently among them because of its excellent thermal stability, relatively low surface resistance and a high transmissivity exceeding 80%. 9) The dye plays a role of generating an electromotive force for DSSC by producing holes and electrons upon incidence of light, the types of which include Ru-based organic metal compounds, organic compounds, and proton inorganic compounds such as N3, N719, N749, etc. Meanwhile, the semiconductor oxide is an important element with many effects on the change in energy conversion efficiencies for DSSC, since it transfers the electrons produced by dye molecules to the TCO substrate.…”

Section: Introductionmentioning

confidence: 99%

Properties of Working Electrodes with IGZO layers in a Dye Sensitized Solar Cell

Kim¹,

Noh²,

Choi³

et al. 2016

J. Korean Ceram. Soc

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We prepared a working electrode (WE) coated with 0~50 nm-thick indium gallium zinc oxide(IGZO) by using RF sputtering to improve the energy conversion efficiency (ECE) of a dye sensitized solar cell (DSSC). Transmission electron microscope (TEM) and energy dispersive spectroscopy (EDS) were used to analyze the microstructure and composition of the IGZO layer. UV-VIS-NIR spectroscopy was used to determine the transparency of the WE with IGZO layers. A solar simulator and a potentiostat were used to confirm the photovoltaic properties of the DSSC with IGZO layer. From the results of the microstructural analysis, we were able to confirm the successful deposition of an amorphous IGZO layer with the expected thickness and composition. From the UV-VIS-NIR analysis, we were able to verify that the transparency decreased when the thickness of IGZO increased, while the transparency was over 90% for all thicknesses. The photovoltaic results show that the ECE became 4.30% with the IGZO layer compared to 3.93% without the IGZO layer. As the results show that electron mobility increased when an IGZO layer was coated on the TiO 2 layer, it is confirmed that the ECE of a DSSC can be enhanced by employing an appropriate thickness of IGZO on the TiO 2 layer.

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Thin copolymer-cased light-emitting display made with fluorine-foped tin oxide substrates

Cited by 10 publications

References 24 publications

Influence of the Transparent Conductive Oxides on the P-OLEDs Behavior

Influence of the Transparent Conductive Oxides on the P-OLEDs Behavior

Optical and morphological properties of ZnO and Alq3 incorporated polymeric thin layers fabricated by the dip-coating method

Properties of Working Electrodes with IGZO layers in a Dye Sensitized Solar Cell

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