Open AccessReduced threshold of optically pumped amplified spontaneous emission and narrow line-width electroluminescence at cutoff wavelength from bilayer organic waveguide devices
Author(s) -
JyhYeong Chang,
Yu Syuan Huang,
Po-Ting Chen,
Ruei Lin Kao,
Xuan You Lai,
Chii Chang Chen,
Cheng Chung Lee
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.014695
Subject(s) - materials science , amplified spontaneous emission , electroluminescence , optoelectronics , bilayer , waveguide , wavelength , cutoff frequency , optics , spontaneous emission , full width at half maximum , layer (electronics) , physics , laser , nanotechnology , membrane , biology , genetics
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/cm 2 , suggesting a reliable device performance for high-power applications and further exploration of electrically-pumped ASE.