Hydrothermal synthesis and inkjet printing of hexagonal-phase NaYF4: Ln3+ upconversion hollow microtubes for smart anti-counterfeiting encryption

2018 ◽  
Vol 2 (11) ◽  
pp. 1997-2005 ◽  
Author(s):  
Shaowen Xie ◽  
Chao Tong ◽  
Haihu Tan ◽  
Na Li ◽  
Liang Gong ◽  
...  
Keyword(s):  
Rare Earth ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Inkjet Printing ◽  
Hexagonal Phase ◽  
Luminescence Properties ◽  
Rare Earth Doped

Rare-earth doped NaYF4 upconversion hollow microtubes with good luminescence properties were synthesized by PAA mediated hydrothermal method and used for constructing smart anti-counterfeiting encryption by inkjet printing.

scholarly journals The pH Value Control of Morphology and Luminescence Properties of Gd2O2S: Tb3+ Phosphors

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 646
Author(s):  
Peng Jiang ◽  
Zhipeng Li ◽  
Wei Lu ◽  
Yi Ma ◽  
Wenhuai Tian
Keyword(s):  
Electron Beam ◽  
Rare Earth ◽  
Ph Value ◽  
Uv Light ◽  
Hexagonal Phase ◽  
Band Gap Energy ◽  
Information Storage ◽  
Luminescence Properties ◽  
Research Fields ◽  
Rare Earth Doped

Developing rare-earth doped oxysulfide phosphors with diverse morphologies has significant value in many research fields such as in displays, medical diagnosis, and information storage. All of the time, phosphors with spherical morphology have been developed in most of the related literatures. Herein, by simply adjusting the pH values of the reaction solution, Gd2O2S:Tb3+ phosphors with various morphologies (sphere-like, sheet-like, cuboid-like, flat square-like, rod-like) were synthesized. The XRD patterns showed that phosphors with all morphologies are pure hexagonal phase of Gd2O2S. The atomic resolution structural analysis by transmission electron microscopy revealed the crystal growth model of the phosphors with different morphology. With the morphological change, the band gap energy of Gd2O2S:Tb3+ crystal changed from 3.76 eV to 4.28 eV, followed by different luminescence performance. The samples with sphere-like and cuboid-like microstructures exhibit stronger cathodoluminescence intensity than commercial product by comparison. Moreover, luminescence of Gd2O2S:Tb3+ phosphors have different emission performance excited by UV light radiation and an electron beam, which when excited by UV light is biased towards yellow, and while excited by an electron beam is biased towards cyan. This finding provides a simple but effective method to achieve rare-earth doped oxysulfide phosphors with diversified and tunable luminescence properties through morphology control.

Hydrothermal synthesis and tunable up-conversion white luminescence properties of KSc(MoO4)2:Ln3+ (Ln = Yb, Er, Tm and Ho) crystals

CrystEngComm ◽  
2020 ◽  
Vol 22 (19) ◽  
pp. 3361-3370 ◽  
Author(s):  
Yini Mao ◽  
Li Jiang ◽  
Pengfei Xian ◽  
Qiongfen Fu ◽  
Shanshan Hu ◽  
...  
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Hexagonal Phase ◽  
Luminescence Properties ◽  
One Step ◽  
White Luminescence

Pure hexagonal phase KSc(MoO4)2 crystals with a hexagonal block shape were successfully synthesized via a one-step hydrothermal method.

Controllable hydrothermal synthesis of Eu3+/Tb3+/Dy3+ activated Zn8[(BO3)3O2(OH)3] micro/nanostructured phosphors: energy transfer and tunable emissions

RSC Advances ◽  
2016 ◽  
Vol 6 (92) ◽  
pp. 89113-89123 ◽  
Author(s):  
P. Liang ◽  
J. W. Liu ◽  
Z. H. Liu
Keyword(s):  
Energy Transfer ◽  
Rare Earth ◽  
Hydrothermal Synthesis ◽  
Luminescence Properties ◽  
Rare Earth Doped ◽  
Co Doped

When Eu3+ and Tb3+ ions are co-doped into the ZBH matrix, the phosphor yielded tunable emissions. The concentration of rare earth doped can change the composition and further change the morphology and the luminescence properties.

Luminescence properties of rare-earth-doped fluoride borate crystals

2021 ◽  
pp. 163343
Author(s):  
Tatyana B. Bekker ◽  
Alexey A. Ryadun ◽  
Alexey V. Davydov ◽  
Vladimir P. Solntsev ◽  
Veronika D. Grigorieva
Keyword(s):  
Rare Earth ◽  
Luminescence Properties ◽  
Rare Earth Doped

Hydrothermal Synthesis and Upconversion Properties of Yb3+, Tm3+ Co-Doped Gd6MoO12 Phosphor with Regular Morphologies

2014 ◽  
Vol 597 ◽  
pp. 109-112
Author(s):  
Jia Yue Sun ◽  
Bing Xue ◽  
Qiu Mei Di ◽  
Qi Guang Xu ◽  
Liu Han
Keyword(s):  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Ph Value ◽  
Upconversion Luminescence ◽  
Synthesis Condition ◽  
Luminescence Properties ◽  
Pumping Power ◽  
Co Doped

Yb3+, Tm3+ co-doped Gd6MoO12 phosphors were prepared by the hydrothermal method. After tuning the PH value and EDTA, phosphors present different morphologies including hexagonal prisms, spindles, and spheres. Under 980nm excitation, the upconversion luminescence properties of the as-prepared phosphors are studied based on changing the synthesis condition. It is found that usage of EDTA and pH changing both play crucial key in the formation of morphology. Pumping power on the UC luminescence properties and level diagram mechanism of Gd6MoO12:Yb3+/Tm3+phosphor have also been discussed.

Blue, Green and Red Upconverted Emission of Controlled Hydrothermal Pressure Synthesized Y2O3: Er3+ (1%) Tm3+ (1%) and Different Yb3+ Ratio Conditions Nanophosphors

2019 ◽  
Vol 9 (3) ◽  
pp. 226-231 ◽  
Author(s):  
Solange Ivette Rivera Manrique ◽  
Felipe de Jesús Carrillo Romo ◽  
Antonieta García Murillo ◽  
Carlos Eduardo Rodríguez García ◽  
Jorge Roberto Oliva Uc
Keyword(s):  
Crystal Structure ◽  
Rare Earth ◽  
Hydrothermal Method ◽  
Near Infrared ◽  
Initial Pressure ◽  
Sem Images ◽  
Host Matrix ◽  
Chemical Homogeneity ◽  
Co Doping ◽  
Rare Earth Doped

Introduction: Rare earth-doped Upconverting Nanoparticles (UCN's) can convert near-infrared photons into visible photons via multiphoton processes, which makes it a good material for generating white light. The production of luminescent materials for technology applications focuses on controlling powder characteristics such as chemical homogeneity and low impurity levels. Objective: In this research study, we synthesized Er3+ (1%) Tm3+ (1%) Yb3+ (at different percentages) by co-doping Y2O3 NPs, using the Controlled-Pressure Hydrothermal Method (CPHM), with nitrogen. The ratio used was chosen to conduct a detailed photolumniscence analysis. Methods: Samples of Y2O3: Er3+ (1%) Tm3+ (1%) Yb3+ (at 1.5%, 2%, and 2.5%) were prepared using the controlled-pressure hydrothermal method (CPHM). Each solution was transferred into a mini-clave drive Büchiglasuster with an inner Teflon vessel. In this case, the mini-clave was heated at 190°C for 3 h, and nitrogen was used to control the pressure. The initial pressure was 20 bars; it was increased during the process to 42 bars. The powders obtained were washed with distilled water using centrifugation at 4000 rpm for 15 min. The washed product was dried to 120°C, followed by subsequent heat treatment at 1000°C for 5 h. Results: The representative XRD patterns for the Y2O3: Er3+ (1%) Tm3+ (1%) and Yb3+ (at 1.5%, 2%, 2.5%) doped samples confirms the presence of a cubic Y2O3 crystal structure. Scanning Electron Microscope (SEM) images show that the morphology of these particles is spherical. Upconversion photoluminescence spectra of Y2O3:Er3+ (1% mol) Tm3+ (1% mol) Yb3+ (1.5% mol), Yb3+ (2.0% mol), and Yb3+ (2.5% mol), after 908-nm excitation. Blue, green, and red bands are centred at 440 nm, 469 nm, 618 nm, and 678 nm, respectively. Conclusion: The controlled-pressure hydrothermal method is a productive method for synthesizing rare earth-doped and codoped Y2O3; when Er3+, Yb3+, and Tm3+ ions are introduced into the host matrix, they do not cause any changes in the cubic structure nor influence the crystal structure. This method can used to synthesize any type of nanoparticle, because it involves low pressure (10-20 bars), low temperatures, and short time reactions.

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