Development of Blue Emitting Organic Phosphors of Diphenylquionial (DPQ) Group for OLED

Zade, G. D.

doi:10.48175/ijarsct-854

Cited by 1 publication

(1 citation statement)

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“…Organic light-emitting diodes (OLEDs) can be characterized as electroluminescent semiconductor devices that uses multilayer structures of organic materials 1,2 . The organic multilayer is inserted between an anode used as a transparent conductive oxide (TCO) and a cathode used as a metallic thin film 3,4 .…”

Section: Introductionmentioning

confidence: 99%

Circular economy of ITO thin films deposited on glass obtained from degraded OLED devices

Santos

Jesus

Burini

et al. 2021

RBAV

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In this work, circular economy was investigated for commercial indium tin oxide (ITO) thin films deposited on glass substrates obtained from degraded organic light-emitting diodes (OLED). These devices were assembled and polarized at laboratory in a previous work. For each substrate, with geometry 2.5 × 2.5 cm, four OLEDs with active area of 3 × 3 mm were set up. These OLED devices were assembled with ITO as the electrode anode and successive depositions of other materials (layer-by-layer), to form the complete structure. To obtain the recovered ITO, all layers were removed from the samples containing the OLEDs previously mounted, remaining only the ITO thin films, that were cleaned with commercial product together with the received ITO/glass samples. Both samples were compared using some techniques, such as: colorimetry, electrical resistance, and Raman spectroscopy. A methodology with light-emitting diode (LED) device polarized emitting light crossing the ITO thin films was used, and the luminance with chromaticity coordinates was obtained, revealing the good transparency of the thin films. Electrical resistance of recovered ITO revealed five higher orders of magnitude in comparison to the one of received ITO. This fact can be tributed to a poly(3,4-ethylenedioxythiophene) doped with poly(styrenesulfonate) (PEDOT:PSS) layer, causing corrosion of the ITO thin films during the assembly of OLEDs or loss of the field lines created during the electrical measurements by probes of four-point probe. Raman spectroscopy did not show satisfactory results in the chemical composition analyses of the samples, but it indicated good cleaning process of the samples before the analyses.

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Section: Introductionmentioning

confidence: 99%