The Starna SF Series consists of polymer blocks doped with organic fluorescent compounds exhibiting excitation and emission properties spanning visible and near-infrared (NIR) wavelengths. These references enable routine performance qualification of fluorescence spectrophotometers and fluorimeters, compatible with both continuous-source and flash-source instruments.

The fluorescence materials are incorporated into a solid polymer matrix, preventing solvent evaporation and providing excellent long-term stability due to resistance against photodecomposition and bleaching under typical operating conditions. This broad spectral range allows the selection of references with spectral characteristics closely matching those of the analyte, facilitating spectral overlap and measurable signals without altering slit widths or wavelength settings.