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We report blue- and green-emitting two-photon probes derived from naphthalene and fluorene derivatives (as fluorophores) and an endoplasmic reticulum (ER) retrieval peptide (KDEL; as an ER-targeting moiety) that can detect the ER in a live cell by both one-photon and two-photon microscopy (TPM) and in a live tissue by TPM.Power-dependent photoluminescence (PL) decay kinetics of silicon nanocrystals (Si NCs) in solid and liquid samples were studied under cw and pulsed excitation. The lifetime distribution and, consequently the measured