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Characterization of UCNP-NOBF4 and lyophilized dBSA-UCNP-NOBF4 (dBSA at optimal concentration—10 μM): (a) PL emission spectrum of UCNP-NOBF4 and lyophilized dBSA-UCNP-NOBF4 under excitation at 980 nm; (b) hydrodynamic diameter distributions of UCNP-NOBF4 and lyophilized dBSA-UCNP-NOBF4 acquired by DLS in deionized water.
