Investigating underlying mechanism in spectral narrowing phenomenon induced by microcavity in organic light emitting diodes
| Autor: | Yu-Che Hsiao, Miaosheng Wang, Jie Lin, Bin Hu, Xingyuan Liu |
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| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Physics::Instrumentation and Detectors Science Exciton Physics::Optics General Physics and Astronomy 02 engineering and technology Electroluminescence Signal Article General Biochemistry Genetics and Molecular Biology Condensed Matter::Materials Science 03 medical and health sciences OLED lcsh:Science Diode Condensed Matter::Quantum Gases Multidisciplinary Condensed Matter::Other business.industry Linear polarization General Chemistry 021001 nanoscience & nanotechnology Photoexcitation 030104 developmental biology Optoelectronics lcsh:Q 0210 nano-technology business Lasing threshold |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019) Nature Communications |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-019-09585-0 |
| Popis: | This paper reports our experimental studies on the underlying mechanism responsible for electroluminescence spectral narrowing phenomenon in the cavity-based organic light-emitting diodes. It is found that the microcavity generates an emerging phenomenon: a magneto-photoluminescence signal in Poly(9,9-dioctylfluorene-alt-benzothiadiazole) polymer under photoexcitation, which is completely absent when microcavity is not used. This provides an evidence that microcavity leads to the formation of spatially extended states, functioning as the intermediate states prior to the formation of Frenkel excitons in organic materials. This is confirmed by the magneto-electroluminescence solely observed from the cavity-based light-emitting diodes under electrical injection. Furthermore, the narrowed electroluminescence output shows a linear polarization, concurrently occurred with magneto-electroluminescence. This indicates that the spatially extended sates become aligned towards forming coherent light-emitting excitons within the microcavity through optical resonance. Clearly, the spatially extended states present the necessary condition to realize electroluminescence spectral narrowing phenomenon towards lasing actions in cavity-based organic light-emitting diodes. Realizing electrically-pumped lasing actions in microcavity organic light-emitting diodes requires elucidating the origin of spectrally-narrowed electroluminescence amplification. Here, the authors show that the microcavity induces spatially extended states with polaron-pair like characteristics. |
| Databáze: | OpenAIRE |
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