Direct Evidence of a Surface Quenching Effect on Size-Dependent Luminescence of Upconversion Nanoparticles

The surface chemistry of upconversion nanoparticles can effectively control the quenching effect of water molecules affecting the thermal dynamics of luminescence.

Download Full-text

First direct evidence of size-dependent structural transition in nanosized nickel particles

Philosophical Magazine A ◽

10.1080/01418619908210344 ◽

1999 ◽

Vol 79 (5) ◽

pp. 1021-1031 ◽

Cited By ~ 47

Author(s):

S. Illy ◽

O. Tillement ◽

F. Machizaud ◽

J. M. Dubois ◽

F. Massicot ◽

...

Keyword(s):

Structural Transition ◽

Direct Evidence ◽

Size Dependent ◽

Nickel Particles

Download Full-text

Multifunctional NaYF4:Yb3+, Er3+@Au Nanocomposites: Upconversion Luminescence, Temperature Sensing and Photothermal Therapy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1088.23 ◽

2015 ◽

Vol 1088 ◽

pp. 23-27 ◽

Cited By ~ 7

Author(s):

Dong Dong Li ◽

Qi Yue Shao ◽

Yan Dong ◽

Jian Qing Jiang

Keyword(s):

Gold Nanoparticles ◽

Photothermal Therapy ◽

Upconversion Luminescence ◽

Separation Distance ◽

Temperature Sensing ◽

Upconversion Nanoparticles ◽

Composite Nanostructures ◽

Sensing Properties ◽

Quenching Effect ◽

Biomedical Fields

Composite nanostructures of NaYF4:Yb3+, Er3+@Au have been successfully prepared by attaching gold nanoparticles onto the surface of NaYF4: Yb3+, Er3+ upconversion nanoparticles (UCNPs). NaYF4 inert shell was used to adjust the separation distance between gold nanoparticles and UCNPs. Effects of the gold nanoparticles on their upconversion luminescent (UCL), temperature sensing and photothermal therapy properties were systematically investigated. For all samples, a slight decrease of the UCL intensity was observed after gold nanoparticles attachment, suggesting that the nonradiative quenching eﬀect is the dominant interaction between UCNPs and gold nanoparticles. However, the reduction of the UCL intensity is negligible due to the significant improvement of UCL properties by NaYF4shell. In addition, the gold attachment can obviously improve the photothermal conversion effect, but do not affect the temperature sensing properties of NaYF4:Yb3+, Er3+ UCNPs, indicating their high capability for multifunctional applications in biomedical fields.

Download Full-text

Size-dependent abnormal thermo-enhanced luminescence of ytterbium-doped nanoparticles

Nanoscale ◽

10.1039/c7nr04575a ◽

2017 ◽

Vol 9 (36) ◽

pp. 13794-13799 ◽

Cited By ~ 28

Author(s):

Xiangshui Cui ◽

Yao Cheng ◽

Hang Lin ◽

Feng Huang ◽

Qingping Wu ◽

...

Keyword(s):

Energy Migration ◽

Size Dependent ◽

Enhanced Photoluminescence ◽

Surface Quenching ◽

Enhanced Luminescence ◽

Increasing Temperature

The suppression of energy migration-mediated surface quenching with increasing temperature leads to the abnormal thermo-enhanced photoluminescence of LNP.

Download Full-text

Upconversion fluorescent and X-ray-sensitive bifunctional nanoprobes for assessing the penetrability of inorganic nanoparticles in the digestive system

MedChemComm ◽

10.1039/c6md00703a ◽

2017 ◽

Vol 8 (5) ◽

pp. 1053-1062

Author(s):

Zenghui Chen ◽

Xiaofeng Wu ◽

Shigang Hu ◽

Pan Hu ◽

Huanyuan Yan ◽

...

Keyword(s):

Digestive System ◽

Inorganic Nanoparticles ◽

Upconversion Nanoparticles ◽

X Ray ◽

Size Dependent ◽

X Ray Imaging ◽

System P

We systematically evaluated size-dependent and surface-dependent penetrability of upconversion nanoparticles towards the digestive system of the mouse through fluorescent signals and X-ray imaging.

Download Full-text

The use of zinc ions to control the size of Yb/Er:KMnF3 nanocrystals with single band emission

CrystEngComm ◽

10.1039/c5ce01592h ◽

2015 ◽

Vol 17 (44) ◽

pp. 8457-8462 ◽

Cited By ~ 7

Author(s):

Lei Lei ◽

Jiajia Zhou ◽

Junjie Zhang ◽

Shiqing Xu

Keyword(s):

Direct Evidence ◽

Upconversion Luminescence ◽

Single Band ◽

Initial Solution ◽

Zinc Ions ◽

Size Dependent ◽

Band Emission ◽

Novel Method

A novel method to modify the size of Yb/Er:KMnF3 NCs by introducing Zn2+ in the initial solution is presented, and the results can provide direct evidence for the size-dependent upconversion luminescence.

Download Full-text