Dynamic tailorable local luminescence patterns on single upconversion fluoride microcrystals via in situ oxidation through laser irradiation

Upconversion (UC) micro/nanomaterials have enabled many promising applications owing to their unique near-infrared to visible emission characteristics. However, some practical applications are limited by the static and invariant emission colours and patterns of UC materials. Here, we demonstrated a...

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Bibliographic Details
Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2019, Vol.7 (38), p.11879-11886
Main Authors: Gao, Dangli, Zhao, Dan, Xin, Hong, Cai, Anjiang, Zhang, Xiangyu
Format: Article
Language:English
Subjects:
Excitation
Fluorides
Heterojunctions
Holmium
Irradiation
Luminescence
Microcrystals
Nanomaterials
Near infrared radiation
Oxidation
Spatial distribution
Upconversion
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Summary:Upconversion (UC) micro/nanomaterials have enabled many promising applications owing to their unique near-infrared to visible emission characteristics. However, some practical applications are limited by the static and invariant emission colours and patterns of UC materials. Here, we demonstrated a novel dynamic UC luminescence pattern and luminescent heterogeneous spatial distribution mediated by laser irradiation. Interestingly, the distinct red dumbbell pattern was submerged gradually by moving the green stripes from the excitation position at one end of a microtube to the other end along the length direction when elevating the power density of excitation light. The underlying reason for the dynamic luminescence patterns obtained by power density controlling was explored, and a mechanism based on an in situ oxidation reaction on NaYbF 4 :Ho 3+ UC microcrystals was revealed. The oxidation reaction between O 2 and NaYbF 4 :Ho 3+ microcrystals was induced by increasing excitation power density and irradiation duration leading to a lattice-mismatched NaYbF 4 and YbOF heterojunction. This unique heterojunction architecture not only modifies the profiles and colours of the luminescent patterns, but also separates the processes of light–light conversion and light–heat conversion in time and space. These studies have provided a deeper insight into the local in situ oxidation mechanisms of fluoride crystals and offered a novel route toward the tuning of UC luminescence using a heterojunction.
ISSN:2050-7526
2050-7534
DOI:10.1039/C9TC04148F