Abstract
AbstractLanthanide‐doped upconversion nanocrystals are an emerging class of near‐IR‐sensitive luminescent nanomaterials that have aroused widespread interest in the investigation of their unique optical properties for sensing, biomedical, and energy applications. In this work, we have hydrothermally prepared NaYF4:Yb,Er upconversion nanocrystals that can respond with brilliant photoluminescence to near‐infrared laser light. The structural phase of the NaYF4:Yb,Er upconversion nanocrystals can be controlled by extending the hydrothermal reaction to visibly tune their emission intensity. The highly photoluminescent NaYF4:Yb,Er colloidal nanocrystals are subsequently assembled in host matrices of hard substrates and polymethyl methacrylate plastics by colloidal solution solidification to fabricate optical display components that may be useful as a potential alternative for fingerprint identification and encryption.
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