Inkjet printed polymer light-emitting devices fabricated by thermal embedding of semiconducting polymer nanospheres in an inert matrix

Abstract

An aqueous dispersion of semiconducting polymer nanospheres was used to fabricate polymer light-emitting devices by inkjet printing in an easy-to-apply process with a minimum feature size of 20μm. To form the devices, the electroluminescent material was printed on a nonemitting polystyrene matrix layer and embedded by thermal annealing. The process allows the printing of light-emitting thin-film devices without extensive optimization of film homogeneity and thickness of the active layer. Optical micrographs of printed device arrays, electroluminescence emission spectra, and I∕V characteristics of printed ITO/PEDOT:PSS/PS/SPN/Al devices are presented.

Direct Sub‐Micrometer‐Patterning of Conjugated Polymers and Polymer Light‐Emitting Devices by Electron Beam Lithography

“…deposition processes commonly used for polymers, and can, therefore, be teamed with other structuring methods like inkjet printing in order to obtain small structures that are not attainable with these methods. This would combine the production speed of the 'coarser' processing method (structures that can be produced by inkjet printing feature a resolution of about 20 mm) [16] with a more precise structuring performed by electron beam degradation. Moreover, the presented method may also be used to inscribe photonic structures, such as distributed feedback structures for laser action, directly into the material without any additional pattering step.…”

“…[14] Recent approaches that combine the solution-based deposition of conjugated polymers with methods for patterning of PLEDs include the deliberate formation of holes in a polymer layer by inkjet printing, followed by the filling of these holes with electroluminescent polymer, [15] as well as the deposition of a water-based dispersion of semiconducting polymer nanospheres onto a polymer matrix layer with subsequent embedding. [16] However, both methods are limited to feature sizes in the range of 10 to 20 mm.…”

Electrochromism: Basis and Application of Nanomaterials in Development of High Performance Electrodes

“…Os tamanhos de partícula são de 35-100 nm e seus filmes finos exibem condutividades até 900 S cm 79 Em uma arquitetura refletora usando um eletrodo de ouro pulverizado, nanotubos de PEDOT mudaram de azul escuro para azul claro com tempos de resposta de 20 a 30 ms por oxidação e redução, respectivamente. Em dispositivos window-like, templates porosos de alumina depositados por pulverização sobre eletrodo de ITO foram utilizados para crescer nanoestruturas de PEDOT, as quais exibiram intervalos de mudança de 50 e 70 ms. 80 A utilização desses nanotubos de polímeros condutores para aplicações eletroquímicas é relativamente recente, como explicado por Chang e colaboradores 81 no trabalho de revisão sobre "eletroquímica rápida de nanotubos de polí-meros condutores". Graças ao formato longo e tubular, os nanotubos promovem rápida difusão dos contraíons para dentro e para fora das estruturas, sendo que dispositivos flexíveis baseados em transmissão e reflexão foram construídos com base nessa tecnologia.…”

Control over the photophysical properties of nanoparticles of regioregular poly(3-octylthiophene) using various poor solvents

“…The charge transport and charge separation can be tuned by controlling particle size and chain packing within the nanoparticles [14,15,18]. In addition, the CPNs can be utilized in an inkjet process, which is cheap and easy to fabricate various structures [19,20]. Therefore, it is rather important to gain fundamental knowledge concerning the formation and aggregation behaviors of CPNs.…”