Morphology Manipulation and Upconversion Luminescence Enhancement of β-NaLuF4: Er3+ Hexagonal Microtubes via Sr2+ Doping

A new and facile strategy to enhance the upconversion luminescence (UCL) emission of NaLuF4: Er3+ microcrystals (MCs) using strontium (Sr) as a dopant has been reported. With the introduction of Sr2+, the products change from long NaLuF4: Er3+ hexagonal microtubes to short hexagonal microtubes and finally to hexagonal microprisms. The growth mechanism is profoundly discussed according to the different reaction time-dependent morphologies. More importantly, the total fluorescence intensity is significantly reinforced by doping Sr2+ ions. When 18% Sr2+ is doped into NaLuF4: Er3+ hexagonal microtubes, the maximum green and red luminescence intensities are about 5.8 and 4.4 times higher than those of Sr2+-free samples, respectively. The influences of Sr2+ ion doping content on the phase, the morphology, and the local crystal field symmetry of the as-synthesized NaLuF4 crystals are investigated.

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Upconversion Luminescence Properties of Er3+ Doped Yb2Ti2O7 Nanophosphor by Gd3+ Codoping

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2016.11833 ◽

2016 ◽

Vol 16 (4) ◽

pp. 3690-3694 ◽

Cited By ~ 6

Author(s):

B. S Cao ◽

J. L Wu ◽

X. H Wang ◽

Z. Q Feng ◽

B Dong

Keyword(s):

Cell Parameter ◽

Upconversion Luminescence ◽

Sol Gel ◽

Nominal Composition ◽

Face Centered Cubic ◽

Cubic Crystal ◽

Crystal Field Symmetry ◽

Field Symmetry ◽

Face Centered ◽

Upconversion Emissions

Er3+ doped Yb2Ti2O7 nanophosphors by Gd3+ codoping with nominal composition of (Er0.05Yb0.95−xGdx)2Ti2O7 (x = 0, 0.2, 0.4, 0.6, 0.8, and 0.95) have been prepared by sol–gel method. −Er3+–Gd3+ codoped Yb2Ti2O7 was characteristic of a typical face-centered cubic crystal phase, and the unit cell parameter increased linearly with the increase of Gd3+ concentration. Under a 976 nm laser diode excitation, both green and red upconversion emissions were observed and the upconversion emissions were enhanced significantly by Gd3+ codoping, showing the strongest green and red emissions at 80 mol% Gd3+ codoping. The intensity ratio of green to red emissions (Igreen/Ired) increased monotonously with the increase of Gd3+ concentration. The energy transfer between Yb3+ and Er3+ and the variation of local crystal field symmetry of Er3+ by the substitution of Yb3+ by Gd3+ ions led to the improvement of upconversion properties of Er3+–Gd3+ codoped Yb2Ti2O7 nanophosphors.

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Enhancing upconversion luminescence of NaYF4:Yb/Er nanocrystals by Mo3+ doping and their application in bioimaging

Dalton Transactions ◽

10.1039/c4dt00172a ◽

2014 ◽

Vol 43 (31) ◽

pp. 12037-12043 ◽

Cited By ~ 48

Author(s):

Dongguang Yin ◽

Chengcheng Wang ◽

Juan Ouyang ◽

Kailin Song ◽

Bing Liu ◽

...

Keyword(s):

Upconversion Luminescence ◽

Luminescence Enhancement ◽

Ion Doping

In this work, we investigated the upconversion luminescence enhancement of NaYF4:Yb/Er by Mo3+ ion doping.

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Insights into Li+-induced morphology evolution and upconversion luminescence enhancement of KSc2F7:Yb/Er nanocrystals

Journal of Materials Chemistry C ◽

10.1039/c7tc00649g ◽

2017 ◽

Vol 5 (14) ◽

pp. 3503-3508 ◽

Cited By ~ 25

Author(s):

Yangbo Wang ◽

Tian Wei ◽

Xingwen Cheng ◽

Hui Ma ◽

Yue Pan ◽

...

Keyword(s):

Upconversion Luminescence ◽

Tissue Imaging ◽

Morphology Evolution ◽

Deep Tissue ◽

Luminescence Enhancement ◽

Deep Tissue Imaging ◽

Good For ◽

Red Luminescence

Li+ doped KSc2F7:Yb/Er nanocrystals show greatly enhanced upconversion red luminescence that is good for deep tissue imaging.

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Controlling upconversion luminescence patterns in space with red emission enhancement from a single fluoride microcrystal by tuning the excitation mode

RSC Advances ◽

10.1039/c9ra03182k ◽

2019 ◽

Vol 9 (31) ◽

pp. 17537-17542 ◽

Cited By ~ 1

Author(s):

Qingyan Han ◽

Zhu Lu ◽

Wei Gao ◽

Wanting Zhou ◽

Jianxia Qi ◽

...

Keyword(s):

Upconversion Luminescence ◽

Emission Pattern ◽

Luminescence Enhancement ◽

Red Emission ◽

Excitation Mode ◽

Emission Enhancement ◽

Red Luminescence

The UC luminescence patterns can be controlled from the flower-like emission pattern to the red flame-like irradiation pattern with a red luminescence enhancement for a single lanthanide-doped fluoride material by varying the excitation position.

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Enhancing static green upconversion luminescence of NaY(MoO4)2: Yb/Er microcrystals via annealing strategy for anti-counterfeiting applications

Dalton Transactions ◽

10.1039/d1dt00948f ◽

2021 ◽

Author(s):

Xiangyu Zhang ◽

Jialing Wu ◽

Peng Wang ◽

Jie Gao ◽

Feng Gao ◽

...

Keyword(s):

Crystal Structure ◽

Thermal Treatment ◽

Upconversion Luminescence ◽

Luminescence Enhancement ◽

Doped Materials

The majority of the fabricated procedures of lanthanide doped materials involve in thermal treatment which often results in crystallite regrowth, stabilizing the specific crystal structure and luminescence enhancement. The efficiency...

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Simultaneous size adjustment and upconversion luminescence enhancement of β-NaLuF4:Yb3+/Er3+,Er3+/Tm3+ microcrystals by introducing Ca2+ for temperature sensing

CrystEngComm ◽

10.1039/c8ce00127h ◽

2018 ◽

Vol 20 (14) ◽

pp. 2029-2035 ◽

Cited By ~ 28

Author(s):

Aihua Zhou ◽

Feng Song ◽

Yingdong Han ◽

Feifei Song ◽

Dandan Ju ◽

...

Keyword(s):

Low Temperature ◽

Hydrothermal Method ◽

Upconversion Luminescence ◽

Temperature Sensing ◽

Facile Hydrothermal Method ◽

Luminescence Enhancement ◽

Size Adjustment

β-NaLuF4:Yb3+/Er3+ microcrystals have been obtained through a facile hydrothermal method at a relatively low temperature (180 °C) within only two hours.

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