Beyond the shift in absorption wavelengths, oxygen have been observed to influence the fluorescence properties of organic molecules . The electron-donating nature of the oxo-group has been shown to enhance the electron density in the conjugated π-system, thereby increasing the quantum yield and stability of excited states in fluorescent organic compounds . This renders ether-containing molecules suitable candidates for use in optoelectronic devices, such as organic light-emitting diodes (OLEDs) or solar cells, where tunable optical properties are essential. However, the impact of the ether group on optical properties is also dependent on the molecular structure and the degree of conjugation. In more conjugated systems, ether groups can lead to significant changes in both absorption and emission spectra, while in non-conjugated systems, the effect may be more subtle but still contribute to the overall optical behavior.