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Title: | Organic- inorganic nanoparticle composite as an electron injection/hole blocking layer in organic light emitting diodes for large area lighting applications | Authors: | SHANIVARASANTHE NITHYANANDA KUMAR, Rachith BREUGELMANS, Robbe JIANG, Xueshi AHADZADEH, Shabnam BRAMMERTZ, Guy VERDING, Pieter DAENEN, Michael VAN LANDEGHEM, Melissa Cambré, Sofie VANDEWAL, Koen DEFERME, Wim |
Issue Date: | 2023 | Publisher: | Source: | APPLIED SURFACE SCIENCE, 631 (Art N° 157548) | Abstract: | The charge carrier balance in organic light-emitting diodes (OLEDs) is crucial for optimizing external quantum efficiency (EQE). This is typically achieved by using charge injection and blocking layers deposited by vacuum deposition, which increases the fabrication time and cost. This study investigates the potential of polyethylenimine ethoxylated (PEIE), Zinc oxide (ZnO) nanoparticles and a PEIE-ZnO nanocomposite as functional layers for OLEDs with improved electron injection and hole blocking properties fabricated by solution processing. The PEIE-ZnO nanocomposite improves OLED performance: (a) a 28% increase in current density and enhanced electron mobility, (b) two times increase in electron mobility of the electron injection/transport layer, and (c) a reduction in surface and interface trap density. Consequently, the PEIE-ZnO nanocomposite shows an 84% increase in electroluminescence, 52.5% increase in luminous efficacy, 35.5% increment in external quantum efficiency, and increased stability as measured by degradation studies. Employing these interlayers fabricated by the novel and roll-to-roll compatible Spray-on-Screen deposition technique show a comparable OLED performance as that of spin coated and vacuum deposited electron injection layers, which makes the large area fabrication of optoelectronic devices with high efficiencies, high output, low cost, and long lifetime a possible reality. Graphical abstract The PEIE-ZnO nanocomposite thin film as a functional layer fabricated by using Spray on screen technology for the efficient large area organic light emitting diodes. | Keywords: | Organic–inorganic hybrid nanocomposite;Optoelectronics;Roll to roll deposition;Spray on screen | Document URI: | http://hdl.handle.net/1942/40236 | ISSN: | 0169-4332 | e-ISSN: | 1873-5584 | DOI: | 10.1016/j.apsusc.2023.157548 | ISI #: | 001003160000001 | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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