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Fully solution processed Organic Light-emitting Electrochemical Cells (OLEC) with ZnO interlayer for lab-on-chip applications

: Shu, Z.; Beckert, E.; Eberhardt, R.; Tünnermann, A.

Derby, B. ; Society for Imaging Science and Technology -IS&T-:
Printing for Fabrication 2016. Materials, applications, and process : 32nd International Conference on Digital Printing Technologies (NIP), September 12-16, 2016, Manchester, United Kingdom, Technical program and proceedings
Springfield/Va.: IS&T, 2016
ISBN: 978-0-89208-322-0
ISBN: 978-0-89208-323-7
International Conference on Digital Printing Technologies (NIP) <32, 2016, Manchester>
Fraunhofer IOF ()

Microfluidic lab-on-a-chip devices can be used for chemical and biological analyses such as DNA tests or environmental monitoring. In order to make a monolithic and cost-efficient/disposable sensing device, direct integration of excitation light source for fluorescent sensing is often required. A manufacturing process for fully solution-processed blue organic light-emitting electrochemical cells (OLECs) is presented, which consist of pre-patterned ITO, spin-coated ZnO buffer layer and blue light-emitting polymer plus dopants and an inkjet-printed PEDOT:PSS transparent top anode. Furthermore, the fully transparent blue OLEC is able to emit > 2000 cd/m2 light under pulsed driving mode, which fulfils requirements for simple fluorescent on-chip sensing applications. Furthermore, ITO electrodes can be replace by PEDOT:PSS transparent electrodes when a ZnO interlayer is solution processed on top, which enable the mask-free and fully solution processing integration on chips.