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Cross relaxation among sensitizers is commonly regarded as deleterious in fluorescent materials, while it is favorable in photothermal agents. In this work, we coated Prussian blue (PB) on NaNdF4 nanoparticles for the first time to fabricate core-shell nanocomplex to generate new cross relaxation pathways between the ladder-like energy levels of Nd3+ ions and continuous energy band of PB. The photothermal conversion efficiency was exceptionally improved and the mechanism of enhanced photothermal effect was investigated. In vivo photoacoustic imaging and photothermal therapy demonstrated the potential of the enhanced photothermal agents. Moreover, the concept of generating new cross relaxation pathways between different materials is proposed to contribute to the design of all kind of enhanced photothermal agents.
PMID: 30985055 [PubMed - as supplied by publisher]