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Proceedings Paper

Fully solution-processed organic light-emitting electrochemical cells (OLEC) with inkjet-printed micro-lenses for disposable lab-on-chip applications at ambient conditions
Author(s): Zhe Shu; Oliver Pabst; Erik Beckert; Ramona Eberhardt; Andreas Tünnermann
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Paper Abstract

Microfluidic lab-on-chip devices can be used for chemical and biological analyses such as DNA tests or environmental monitoring. Such devices integrate most of the basic functionalities needed for scientific analysis on a microfluidic chip. When using such devices, cost and space-intensive lab equipment is no longer necessary. However, in order to make a monolithic and cost-efficient/disposable microfluidic sensing device, direct integration of the excitation light source for fluorescent sensing is often required. To achieve this, we introduce a fully solution processable deviation of OLEDs, organic light-emitting electrochemical cells (OLECs), as a low-cost excitation light source for a disposable microfluidic sensing platform. By mixing metal ions and a solid electrolyte with light-emitting polymers as active materials, an in-situ doping and in-situ PN-junction can be generated within a three layer sandwich device. Thanks to this doping effect, work function adaptation is not necessary and air-stable electrode can be used. An ambient manufacturing process for fully solution-processed OLECs is presented, which consist of a spin-coated blue light-emitting polymer plus dopants on an ITO cathode and an inkjet-printed PEDOT:PSS transparent top anode. A fully transparent blue OLEC is able to obtain light intensity > 2500 cd/m2 under pulsed driving mode and maintain stable after 1000 cycles, which fulfils requirements for simple fluorescent on-chip sensing applications. However, because of the large refractive index difference between substrates and air, about 80% of emitted light is trapped inside the device. Therefore, inkjet printed micro-lenses on the rear side are introduced here to further increase light-emitting brightness.

Paper Details

Date Published: 24 February 2016
PDF: 7 pages
Proc. SPIE 9745, Organic Photonic Materials and Devices XVIII, 97450W (24 February 2016); doi: 10.1117/12.2210985
Show Author Affiliations
Zhe Shu, Friedrich Schiller Univ. Jena (Germany)
Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Oliver Pabst, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Erik Beckert, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Ramona Eberhardt, Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)
Andreas Tünnermann, Friedrich Schiller Univ. Jena (Germany)
Fraunhofer Institute for Applied Optics and Precision Engineering (Germany)


Published in SPIE Proceedings Vol. 9745:
Organic Photonic Materials and Devices XVIII
Christopher E. Tabor; François Kajzar; Toshikuni Kaino; Yasuhiro Koike, Editor(s)

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