Reduced threshold of optically pumped amplified spontaneous emission and narrow linewidth electroluminescence at cutoff wavelength from bilayer organic waveguide devices

Jui Fen Chang, Yu Syuan Huang, Po Ting Chen, Ruei Lin Kao, Xuan You Lai, Chii Chang Chen, Cheng Chung Lee

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We present a detailed study of the optically and electrically pumped emission in the BSB-Cz/PVK bilayer waveguide devices. By optical pumping we demonstrate that PVK as a spacer between fluorescent BSB-Cz and ITO electrode allows the significant reduction of the threshold for amplified spontaneous emission (ASE) of BSB-Cz. The simulation provides a better understanding of how the PVK thickness affects the waveguide mode field distribution and hence the ASE threshold of BSB-Cz. On the other hand, the BSB-Cz/PVK bilayer OLED exhibits the external quantum efficiency of >1% and anisotropic electroluminescence with spectrally narrowed edge emission at the cutoff wavelength controlled by the BSB-Cz thickness. When tuning the cutoff wavelength to match the peak gain of BSB-Cz, we demonstrate an intense, particularly narrow edge emission (∼5 nm) without obvious degradation of efficiency at a high current density of 1000 mA/cm2, suggesting a reliable device performance for high-power applications and further exploration of electrically-pumped ASE.

Original languageEnglish
Pages (from-to)14695-14706
Number of pages12
JournalOptics Express
Volume23
Issue number11
DOIs
StatePublished - 1 Jun 2015

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