16 April 2008 Photoluminescence degradation of blue OLED emitters
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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.
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Stephan Winter, Sebastian Reineke, Karsten Walzer, Karl Leo, "Photoluminescence degradation of blue OLED emitters", Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 69992N (16 April 2008); doi: 10.1117/12.782784; https://doi.org/10.1117/12.782784
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