MULTIPLEX ASSAY READER SYSTEM

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A system for reading optical codes includes a set of beads or particles, each of which has a surface functionalization selected for attaching a biomolecule to be studied, and a device for reading an optical code provided by rare earth-based light emitters associated with each of the beads or particles. The device includes an excitation source and a color CCD light detector. The excitation source excites the rare earth-based light emitters of each of the beads, thereby causing the emitters to emit light having a unique ratio of relative intensities, the unique ratio of the relative intensities forming the optical code of the bead or particle. The color CCD light detector detects the emitted light having the unique ratio of the relative intensities and a memory stores an image of the emitted light.