Caspase-3BiosensorsFluorescence imagingBiomedicalMulti-functionalAGGREGATION-INDUCED EMISSIONRESONANCE ENERGY-TRANSFERLIGHT-UP PROBE2-PHOTON FLUORESCENT-PROBESMALL-MOLECULE PROBESSIGNAL TURN-ONCELL APOPTOSISMEMBRANE-PERMEANTSURFACE-CHEMISTRYELECTRON-TRANSFER