The wavelength-ratiometric techniques gain increasing popularity in fluorescence probing and sensing for providing inner reference to output signal and removing instrumental artefacts, in this way increasing the sensitivity and reliability of assays. Recent developments demonstrate that such approach can allow achieving much more, with the application of broad range of novel molecular and nanoscale fluorophores (luminophores), exploring the whole power of photophysical and photochemical effects and using extended range of assay formats. Simplicity of detection and potentially rich content of output data allows realizing these techniques in different simplified, miniaturized and multiplexing devices. The latter issues are discussed in Pt. II of these series.
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