Importance of Purcell factor for optimizing structure of organic light-emitting diodes

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The ratio of spontaneous emission inside a diode structure to that in free space is called the Purcell factor (F(lambda)). The structure of organic light-emitting diodes (OLEDs) has a significant influence on the spontaneous emission rate of dipole emitters. Therefore, to describe the optical properties of OLEDs, it is essential to incorporate F(lambda) in the description. However, many optical studies on OLEDs continue to be conducted without considering F(lambda) for simplicity's sake. Hence, in this study, using carefully designed bottom-and top-emitting OLEDs, we show that the external quantum efficiency obtained without considering F(lambda) can be over- or under-estimated, and in some cases, the margin of error may be significant. We also reveal that the subtle distribution of the electroluminescence spectrum can be explained properly only by including F(lambda). Both these results stipulate the importance of including F(lambda) to maintain a quantitative agreement between theoretical and experimental data. Hence, the inclusion of F(lambda) is important for designing OLEDs with enhanced efficiency or desired spectral characteristics. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Publisher
OPTICAL SOC AMER
Issue Date
2019-04
Language
English
Article Type
Article
Citation

OPTICS EXPRESS, v.27, no.8, pp.11057 - 11068

ISSN
1094-4087
DOI
10.1364/OE.27.011057
URI
http://hdl.handle.net/10203/261837
Appears in Collection
EE-Journal Papers(저널논문)
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