The present invention relates to a functionally integrated microanalytical
system for performing fluorescence spectroscopy. A source of
fluorescence-exciting radiation, typically a LED, is integrated onto a
substrate along with a photodetector and, in some embodiments, an optical
filter. A pixel-to-point laser lift-off process is used to effect this
component integration. For those cases in which a filter is required, a
thin film bandgap filter is typically used, such as CdS or
CdS.sub.xSe.sub.1-x (0