Issue 48, 2020

Enhancing the red upconversion luminescence of hybrid porous microtubes via an in situ O-substituted reaction through heat treatment

Abstract

Rare earth-doped upconversion (UC) micro/nanocrystals have important applications in varying fields including multilevel anti-counterfeiting, photonics, deep-tissue imaging, and therapeutics. However, one of the major hurdles is the weak luminescence associated with the constraints of conventional multi-peak emissions in achieving photoluminescence imaging with high spatial resolution and sensitivity. Herein, a technique for the heat treatment of a NaYF4 maternal lattice is presented for achieving porous one-dimensional NaYF4:Yb/Er@YOF:Yb/Er hybrid structures with excellent optical performance through in situ ion-exchange. In the course of detailed studies, an irreversible spatially confined recrystallization of maternal crystals to different phases is found, which preserves the crystal's original morphology and size. The enhanced single-band dark red luminescence emission has been achieved and the responding mechanisms are proposed based on the control of the UC path by phonon mediation. Particularly, these porous one-dimensional NaYF4:Yb/Er@YOF:Yb/Er hybrid structures have been used as potential security ink for writing, indicating immensely promising results for direct anti-counterfeiting applications. Our results demonstrate that the heat treatment technology opens the door for the synthesis of highly efficient single-band red phosphors with expanded applications.

Graphical abstract: Enhancing the red upconversion luminescence of hybrid porous microtubes via an in situ O-substituted reaction through heat treatment

Supplementary files

Article information

Article type
Paper
Submitted
01 Sep 2020
Accepted
23 Oct 2020
First published
26 Oct 2020

J. Mater. Chem. C, 2020,8, 17318-17324

Enhancing the red upconversion luminescence of hybrid porous microtubes via an in situ O-substituted reaction through heat treatment

D. Gao, J. Gao, D. Zhao, Q. Pang, G. Xiao, L. Wang and K. Ma, J. Mater. Chem. C, 2020, 8, 17318 DOI: 10.1039/D0TC04153J

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