Laponite-Modified Biopolymers as a Conformable Substrate for Optoelectronic Devices
Year: 2024
Type: article
Abstract: High Resolution Image Download MS PowerPoint Slide Biopolymers such as carboxymethyl cellulose and hyaluronic acid are alternative substrates for conformable organic light-emitting diodes (OLEDs). However, drawbacks such as mechanical stress susceptibility can hinder the device’s performance under stretched conditions. To overcome these limitations, herein, we developed a nanocomposite based on CMC/HA (carboxymethyl cellulose/hyaluronic acid) and synthetic Laponite, intending to improve the mechanical strength without compromising the film flexibility and transparency (transmittance >80%; 380–700 nm) as substrates for conformable OLEDs. From XRD, FTIR, CP-MAS NMR, and TGA/DTG characterization techniques, it was possible to conclude the presence of Laponite randomly dispersed between the polymer chains. CMC/HA with 5% (w/w) Laponite, CMC/HA 5, presented a higher tensile strength (370.6 MPa) and comparable Young’s modulus (51.0 ± 1.2 MPa) in comparison to the nanocomposites and pristine films, indicating a better candidate for the device’s substrates. To produce the OLED, the multilayer structure ITO/MoO 3 /NPB/TCTA:Ir(ppy) 3 /TPBi:Ir(ppy) 3 /BPhen/LiF was deposited onto the CMC/HA 5 substrate. The OLEDs fabricated using CMC/HA 5 substrates showed higher luminance (12 kcd/m 2 ) and irradiance (0.9 mW/cm 2 ) values when compared with those based on commercial bacterial cellulose. However, the same device presented a lower efficiency (3.2 cd/A) due to a higher current density. Moreover, the OLED fabricated onto the Laponite-modified biopolymer presented reproducible behavior when submitted to continuous bending stress. Thus, CMC/HA 5 demonstrates potential as a transparent conductor substrate for biopolymer-based OLEDs with comparable performance to commercial bacterial cellulose features.
Source: ACS Omega
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $1,935
Funders: Fundação de Amparo à Pesquisa do Estado de São Paulo, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Ministério da Ciência, Tecnologia e Inovação, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Financiadora de Estudos e Projetos, Fundação de Amparo à Pesquisa do Estado de Minas Gerais, Instituto Nacional de Ciência e Tecnologia em Eletrônica Orgânica
Awards: G102485422, G1063147063, G1207375514, G1284350127, G1315605265, G1426168670, G160919479, G1751387150, G22113365, G243653646, G2862184291, G2995739112, G3591860051, G3598345891, G3874022842, G3979333078, G402038981, DESENVOLVIMENTO DE SUBSTRATOS CONDUTORES BIOCOMPATÍVEIS PARA O DESENVOLVIMENTO DE FOTODETETORES PARA IMPLANTE DE RETINA., G4773289129, G5266228037, G5403971652, G5617776692, G5982263092, G6092072043, G6502004700, G6756993358, G7673248907, G8704373836, G871200192
OpenAlex ID: W4400448366