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Proceedings Paper

In situ photoluminescence spectroscopy study of dynamic doping in sandwich-type light-emitting electrochemical cells
Author(s): Sebastian B. Meier; David Hartmann; Wiebke Sarfert; Daniel Tordera; Henk J. Bolink; Albrecht Winnacker
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Paper Abstract

Photoluminescence (PL) spectroscopy has been performed in-situ on iridium(III) ionic transition metal complex (iTMC)- based sandwich-type light-emitting electrochemical cells (LECs) during device operation and after switch-off. It is demonstrated that driving the device leads to a considerable decrease of the PL intensity of the active layer. Two different time regimes for this decrease have been identified. The first one is characterized by a complete recovery of the PL after the device is turned off corroborating the existence of dynamically formed doped regions also in iTMC-based LECs. In the second regime the PL does not completely recover which is attributed to a permanent degradation of the active layer that is the main source for the low lifetime of the devices. Additionally, it is demonstrated how to externally stabilize the dynamic configuration leading to a half lifetime in excess of 1000 hours at simultaneous high brightness of more than 1000 cd/m2 and fast turn-on of less than one second.

Paper Details

Date Published: 13 September 2012
PDF: 10 pages
Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 847617 (13 September 2012); doi: 10.1117/12.928617
Show Author Affiliations
Sebastian B. Meier, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)
Siemens AG (Germany)
David Hartmann, Siemens AG (Germany)
Wiebke Sarfert, Siemens AG (Germany)
Daniel Tordera, Univ. de València (Spain)
Henk J. Bolink, Univ. de València (Spain)
Albrecht Winnacker, Friedrich-Alexander-Univ. Erlangen-Nürnberg (Germany)

Published in SPIE Proceedings Vol. 8476:
Organic Light Emitting Materials and Devices XVI
Franky So; Chihaya Adachi, Editor(s)

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