Thermo-enhanced Upconversion Luminescence in Inert-core/Active-shell UCNPs: Inert-core Matters

Nanoscale ◽  
2021 ◽  
Author(s):  
Youhui Zhou ◽  
Yao Cheng ◽  
Ju Xu ◽  
Hang Lin ◽  
Yuansheng Wang
Keyword(s):  
Upconversion Luminescence ◽  
Upconversion Nanoparticles ◽  
Great Debate ◽  
Inert Core ◽  
Enhanced Luminescence

Recent discoveries on the anomalous thermo-enhanced luminescence of upconversion nanoparticles (UCNPs) have attracted great interests because of their potential significant technological importance. Meanwhile, equally compelling may be the great debate...

Optical Temperature Sensing of Core-Shell Structured NaYF4:Yb3+, Er3+@NaYF4 Nanocrystals with Different Shell Thickness

2015 ◽  
Vol 738-739 ◽  
pp. 27-30
Author(s):  
Dong Dong Li ◽  
Qi Yue Shao ◽  
Yan Dong ◽  
Jian Qing Jiang
Keyword(s):  
Shell Thickness ◽  
Thermal Sensitivity ◽  
Upconversion Luminescence ◽  
Temperature Sensing ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Sensing Properties ◽  
The Core ◽  
Β Phase ◽  
Biomedical Fields

Hexagonal (β)-phase NaYF4:Yb3+, Er3+ upconversion nanoparticles (UCNPs) with and without an inert (undoped NaYF4) shell have been successfully synthesized and the effects of shell thickness on the upconversion luminescence (UCL) and temperature sensing properties were systematically investigated. It was found that the NaYF4 shell and its thickness do not affect the RHS values and thermal sensitivity, but can obviously improve the UCL intensity of NaYF4:Yb3+, Er3+ UCNPs. It implies that the core-shell structured NaYF4:Yb3+, Er3+@NaYF4 UCNPs with excellent UCL properties have great potential to be used as temperature sensing probes in biomedical fields, without considering the influences of the shell thickness on their temperature sensing properties.

Compressed energy transfer distance for remarkable enhancement of the luminescence of Nd3+-sensitized upconversion nanoparticles

2018 ◽  
Vol 6 (24) ◽  
pp. 6597-6604 ◽  
Author(s):  
Dan Wang ◽  
Bin Xue ◽  
Jun Song ◽  
Junle Qu
Keyword(s):  
Energy Transfer ◽  
Enhancement Factor ◽  
Upconversion Luminescence ◽  
Upconversion Nanoparticles ◽  
Transfer Distance

We developed a compressed activator layer (NaYF4:Yb/Er) and a Nd sensitizer layer (NaYF4:Nd) for enhancing (enhancement factor ∼19.8) the upconversion luminescence of ∼808 nm excited-, Nd3+-sensitized nanoparticles.

The Enhancement of Upconversion Luminescence of Gd2O3:Yb,Er Nanoparticles by Ca2+ Codoping for Temperature Sensing at Room and High Temperatures

NANO ◽  
2019 ◽  
Vol 14 (06) ◽  
pp. 1950076 ◽  
Author(s):  
Haiquan Liu ◽  
Jianing Rong ◽  
Yao Song ◽  
Guoqiong Shen ◽  
Wen Gu ◽  
...  
Keyword(s):  
Upconversion Luminescence ◽  
Absolute Temperature ◽  
Temperature Sensing ◽  
Upconversion Nanoparticles ◽  
Chemical Route ◽  
Optical Thermometry ◽  
Wet Chemical ◽  
Wet Chemical Route ◽  
Thermal Detection ◽  
Fir Technique

We prepared a series of Gd2O3:Yb,Er,Ca (3/1/[Formula: see text][Formula: see text]mol.%, [Formula: see text] represents the nominal concentration of Ca element including 0, 2, 3, 4, 5, 7, 10) upconversion nanoparticles (UCNPs) with regular morphology via a wet-chemical route. We observed a simultaneous enhancement of upconversion luminescence (UCL) emission of Gd2O3:Yb,Er after Ca[Formula: see text] ions were doped. When the doping level of Ca[Formula: see text] reaches its optimal concentrate at 5[Formula: see text]mol.%, the red and green emissions increased by 6.3 and 11 times, respectively. The potential application of Gd2O3:Yb,Er,Ca material as a noninvasion optical thermometry based on FIR technique was investigated. The sensing of temperature at both high and room temperatures was realized by choosing different parameters. The absolute temperature sensitivity ([Formula: see text]) of Gd2O3:Yb,Er nanoparticles at 293[Formula: see text]K reached 0.0875[Formula: see text]K[Formula: see text], whereas Gd2O3:Yb,Er, 5[Formula: see text]mol.%Ca was chosen as sensor of high temperature due to its considerable Sa of 0.0060[Formula: see text]K[Formula: see text] at 573[Formula: see text]K. The resultant UCNPs provided a new way for sensitive thermal detection at various target temperatures.

Dye-conjugated upconversion nanoparticles for ratiometric imaging of intracellular pH values

2015 ◽  
Vol 3 (26) ◽  
pp. 6616-6620 ◽  
Author(s):  
Tingchun Ma ◽  
Yun Ma ◽  
Shujuan Liu ◽  
Lili Zhang ◽  
Tianshe Yang ◽  
...  
Keyword(s):  
Intracellular Ph ◽  
Xylenol Orange ◽  
Upconversion Luminescence ◽  
Upconversion Nanoparticles ◽  
Ph Changes ◽  
Ph Values ◽  
Ratiometric Imaging

An xylenol orange-functionalized upconversion nanoprobe has been developed, which can be used for ratiometric upconversion luminescence bioimaging of intracellular pH changes.

scholarly journals Upconversion luminescence and temperature sensing properties of NaGd(WO4)2:Yb3+/Er3+@SiO2 core–shell nanoparticles

RSC Advances ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 3981-3989
Author(s):  
Lu Zheng ◽  
Xinyi Huang ◽  
Jiuping Zhong ◽  
Zijun Wang ◽  
Xiaoning Cheng
Keyword(s):  
Upconversion Luminescence ◽  
Silica Shell ◽  
Temperature Sensing ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Sensing Properties ◽  
The Core ◽  
Thermal Sensing ◽  
Core Shell Nanoparticles

A shell of SiO2 with tunable thickness was uniformly coated on NaGd(WO4)2:Yb3+/Er3+ core upconversion nanoparticles (UCNPs). The effects of the silica shell on UC luminescence and thermal sensing properties of the core–shell UCNPs were investigated.

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