Linked from
The 18 pages that link to Fluorescence spectroscopy, each with the reason it gives.
Photomultiplier tubeRelated: Photomultipliers can detect weak fluorescence from dilute samples.
Quantum yieldRelated: Fluorescence yield helps explain signal strength and compare emitting samples.
Stokes shiftRelated: The shift is a basic feature used to characterize fluorescent samples.
Optical spectrometerRelated: Spectrometers resolve fluorescence emission by wavelength.