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Proceedings Paper

Photoluminescence degradation of blue OLED emitters
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Paper Abstract

Organic light-emitting diodes (OLEDs) based on small-molecule materials are currently developed for applications in flat panel displays and general lighting sources. However, a large number of efficient deep blue emitters still suffer from rather fast degradation and thus, requires further improvement. The aim of the present work is to gain a fundamental understanding of the intrinsic degradation processes causing the low stability of blue OLED emitters. For this purpose we study the photoluminescence (PL) degradation instead of the most often investigated electroluminescence (EL) degradation to separate electrically and optically generated effects. We show a newly developed PL lifetime measurement system which allows the study of degradation processes under the influence of either electron or hole currents. Using this set-up we demonstrate the very high PL stability of the highly efficient blue singlet emitter 2,2',7,7'-tetrakis(2,2-diphenylvinyl)spiro-9,9'-bifluorene (Spiro- DPVBi) under electron and hole currents and compare this to the lifetime of OLEDs using the same emitter material.

Paper Details

Date Published: 16 April 2008
PDF: 8 pages
Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 69992N (16 April 2008); doi: 10.1117/12.782784
Show Author Affiliations
Stephan Winter, Technische Univ. Dresden (Germany)
Sebastian Reineke, Technische Univ. Dresden (Germany)
Karsten Walzer, Technische Univ. Dresden (Germany)
Karl Leo, Technische Univ. Dresden (Germany)

Published in SPIE Proceedings Vol. 6999:
Organic Optoelectronics and Photonics III
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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