Bi-functional NaLuF4:Gd3+/Yb3+/Tm3+ nanocrystals: structure controlled synthesis, near-infrared upconversion emission and tunable magnetic properties

2012 ◽  
Vol 22 (19) ◽  
pp. 9870 ◽  
Author(s):  
Songjun Zeng ◽  
Junjie Xiao ◽  
Qibin Yang ◽  
Jianhua Hao
Keyword(s):  
Magnetic Properties ◽  
Near Infrared ◽  
Upconversion Emission ◽  
Controlled Synthesis

Simultaneous broadband near-infrared emission and magnetic properties of single phase Ni2+-doped β-Ga2O3 nanocrystals via mediated phase-controlled synthesis

2015 ◽  
Vol 3 (12) ◽  
pp. 2886-2896 ◽  
Author(s):  
Suiying Ye ◽  
Yuanhao Zhang ◽  
Huilin He ◽  
Jianrong Qiu ◽  
Guoping Dong
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Near Infrared ◽  
Infrared Emission ◽  
High Accuracy ◽  
Controlled Synthesis ◽  
Ferromagnetic Properties ◽  
Near Infrared Emission

Broadband near-infrared emission and ferromagnetic properties were detected in single phase Ni2+-doped β-Ga2O3 nanocrystals, which is meaningful for its application in high-accuracy communications, bio-labels, etc.

scholarly journals Nano-Crystallization of Ln-Fluoride Crystals in Glass-Ceramics via Inducing of Yb3+ for Efficient Near-Infrared Upconversion Luminescence of Tm3+

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1033
Author(s):  
Jianfeng Li ◽  
Yi Long ◽  
Qichao Zhao ◽  
Shupei Zheng ◽  
Zaijin Fang ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Near Infrared ◽  
Upconversion Luminescence ◽  
Glass Ceramics ◽  
Upconversion Emission ◽  
Ceramic Composites ◽  
Wide Range ◽  
Transmission Window ◽  
Optical Applications ◽  
Upconversion Emissions

Transparent glass-ceramic composites embedded with Ln-fluoride nanocrystals are prepared in this work to enhance the upconversion luminescence of Tm3+. The crystalline phases, microstructures, and photoluminescence properties of samples are carefully investigated. KYb3F10 nanocrystals are proved to controllably precipitate in the glass-ceramics via the inducing of Yb3+ when the doping concentration varies from 0.5 to 1.5 mol%. Pure near-infrared upconversion emissions are observed and the emission intensities are enhanced in the glass-ceramics as compared to in the precursor glass due to the incorporation of Tm3+ into the KYb3F10 crystal structures via substitutions for Yb3+. Furthermore, KYb2F7 crystals are also nano-crystallized in the glass-ceramics when the Yb3+ concentration exceeds 2.0 mol%. The upconversion emission intensity of Tm3+ is further enhanced by seven times as Tm3+ enters the lattice sites of pure KYb2F7 nanocrystals. The designed glass ceramics provide efficient gain materials for optical applications in the biological transmission window. Moreover, the controllable nano-crystallization strategy induced by Yb3+ opens a new way for engineering a wide range of functional nanomaterials with effective incorporation of Ln3+ ions into fluoride crystal structures.

Effect of Li+ ions on enhancement of near-infrared upconversion emission in Y2O3:Tm3+/Yb3+ nanocrystals

2012 ◽  
Vol 112 (9) ◽  
pp. 094701 ◽  
Author(s):  
Dongyu Li ◽  
Yuxiao Wang ◽  
Xueru Zhang ◽  
Hongxing Dong ◽  
Lu Liu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Upconversion Emission

High-energy organic group-induced spectrally pure upconversion emission in novel zirconate-/hafnate-based nanocrystals

CrystEngComm ◽  
2015 ◽  
Vol 17 (37) ◽  
pp. 7169-7174 ◽  
Author(s):  
Xianghong He ◽  
Bing Yan
Keyword(s):  
Pump Power ◽  
Near Infrared ◽  
Incident Light ◽  
Upconversion Emission ◽  
High Energy ◽  
Single Band ◽  
Organic Group ◽  
Red Fluorescence

A series of novel fluoride-based nanophosphors (NPs) exhibiting spectrally pure upconversion (UC) red fluorescence upon near-infrared (980 nm) excitation. The single-band deep-red UC luminescence feature of K3MF7:Yb3+,Er3+ (M = Zr, Hf) NPs is independent of the doping levels of Yb3+–Er3+ and the pump power of incident light.

Shape-controlled synthesis of nanostructured Co-doped ZnO thin films and their magnetic properties

CrystEngComm ◽  
2018 ◽  
Vol 20 (38) ◽  
pp. 5844-5856 ◽  
Author(s):  
F. A. Taher ◽  
E. Abdeltwab
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Zno Thin Films ◽  
Controlled Synthesis ◽  
Shape Controlled ◽  
Doped Zno ◽  
Co Doped ◽  
Complex Nanostructures

Three ferromagnetic complex nanostructures (flower, sheaf, and cactus) of Co-doped ZnO thin films were selectively grown from 1D to 3D.

Phase-controlled synthesis and magnetic properties of cubic and hexagonal CoO nanocrystals

2016 ◽  
Vol 27 (45) ◽  
pp. 455602 ◽  
Author(s):  
Qiongqiong Qi ◽  
Yuanzhi Chen ◽  
Laisen Wang ◽  
Deqian Zeng ◽  
Dong-Liang Peng
Keyword(s):  
Magnetic Properties ◽  
Controlled Synthesis

Upconversion lanthanide nanomaterials: basics introduction, synthesis approaches, mechanism and application in photodetector and photovoltaic devices

2021 ◽  
Author(s):  
Baharak Mehrdel ◽  
Ali Nikbakht ◽  
Azlan Abdul Aziz ◽  
Mahmood S. Jameel ◽  
Mohammed Ali Dheyab ◽  
...  
Keyword(s):  
Optical Properties ◽  
Near Infrared ◽  
Surface Passivation ◽  
Upconversion Emission ◽  
High Energy ◽  
Photovoltaic Devices ◽  
Plasmonic Enhancement ◽  
Host Matrix ◽  
Emission Enhancement ◽  
Improved Performance

Abstract Upconversion (UC) of lanthanide-doped nanostructure has the unique ability to convert low energy infrared (IR) light to high energy photons, which has significant potential for energy conversion applications. This review concisely discusses the basic concepts and fundamental theories of lanthanide nanostructures, synthesis techniques, and enhancement methods of upconversion for photovoltaic and for near-infrared (NIR) photodetector application. In addition, a few examples of lanthanide-doped nanostructures with improved performance were discussed, with particular emphasis on upconversion emission enhancement using coupling plasmon. The use of UC materials has been shown to significantly improve the NIR light-harvesting properties of photovoltaic devices and photocatalytic materials. However, the inefficiency of UC emission also prompted the need for additional modification of the optical properties of UC material. This improvement entailed the proper selection of the host matrix and optimization of the sensitizer and activator concentrations, followed by subjecting the UC material to surface-passivation, plasmonic enhancement, or doping. As expected, improving the optical properties of UC materials can lead to enhanced efficiency of photodetectors and photovoltaic devices.

Controlled Synthesis of Ag 2 Te@Ag 2 S Core–Shell Quantum Dots with Enhanced and Tunable Fluorescence in the Second Near‐Infrared Window

Small ◽  
2020 ◽  
Vol 16 (14) ◽  
pp. 2001003 ◽  
Author(s):  
Yejun Zhang ◽  
Hongchao Yang ◽  
Xinyi An ◽  
Zan Wang ◽  
Xiaohu Yang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Near Infrared ◽  
Core Shell ◽  
Controlled Synthesis ◽  
Infrared Window

scholarly journals Enhanced UV Light Emission by Core-Shell Upconverting Particles Powering up TiO2 Photocatalysis in Near-Infrared Light

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 232
Author(s):  
Agnieszka Jarosz-Duda ◽  
Paulina O’Callaghan ◽  
Joanna Kuncewicz ◽  
Przemysław Łabuz ◽  
Wojciech Macyk
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Uv Light ◽  
Protective Layer ◽  
Upconversion Emission ◽  
High Photocatalytic Activity ◽  
Infrared Light ◽  
Core Shell ◽  
The Core ◽  
Surface Luminescence

The core-shell NaYb0.99F4:Tm0.01@NaYF4 upconverting particles (UCPs) with a high UV emission to apply in NIR-driven photocatalysis were synthesized. The influence of the Yb3+ doping concentration in NaYxF4:Yb0.99−xTm0.01 core particles, and the role of the NaYF4 shell on the upconversion emission intensity of the UCPs were studied. The absorption of NIR light by the obtained UCPs was maximized by increasing the Yb3+ concentration in the core, reaching the maximum for Y3+-free particles (NaYb0.99F4:Tm0.01). Additionally, covering the NaYb0.99F4:Tm0.01 core with a protective layer of NaYF4 minimized the surface luminescence quenching, which significantly improved the efficiency of upconversion emission. The high intensity of the UV light emitted by the NaYb0.99F4:Tm0.01@NaYF4 under NIR irradiation resulted in a high photocatalytic activity of TiO2 (P25) mixed with the synthesized material.

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