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Luminescent NaYF4:Yb,Er upconversion nanocrystal colloids: Towards controlled synthesis and near‐infrared optical response


Lanthanide‐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. This article is protected by copyright. All rights reserved

Authors:   Hau V. Duong, Quy‐Tung Truong, Thai‐Hoa Tran, Thanh‐Dinh Nguyen
Journal:   The Canadian Journal of Chemical Engineering
Year:   2017
Pages:   n/a
DOI:   10.1002/cjce.22851
Publication date:   30-Mar-2017
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