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Journal Article
Importance of Purcell Factor for Optimizing Structure of Organic Light-emitting Diodes
- Authors
- Hyunsu Cho, Jin Chung, Jinouk Song, Jaeho Lee, Hyunkoo Lee, Jonghee Lee, Jaehyun Moon, Seunghyup Yoo, Nam Sung Cho
- Issue Date
- 2019-04
- Citation
- Optics Express, v.27, no.8, pp.11057-11068
- ISSN
- 1094-4087
- Publisher
- Optical Society of America(OSA)
- Language
- English
- Type
- Journal Article
- Abstract
- 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.
This work is distributed under the term of Creative Commons License (CCL)
(CC BY)
(CC BY)
