Luminescent properties of passivated europium(iii)-doped rare earth oxide sub-10 nm nanoparticles

The precursor prepared by co-precipitation method was sintered at various temperatures to synthesize crystalline manganese tungstate (MnWO4). Sintered MnWO4 showed the best crystallinity at a sintering temperature of 800 °C. Rare earth ion (Dysprosium; Dy3+) was added when preparing the precursor to enhance the magnetic and luminescent properties of crystalline MnWO4 based on these sintering temperature conditions. As the amount of rare earth ions was changed, the magnetic and luminescent characteristics were enhanced; however, after 0.1 mol.%, the luminescent characteristics decreased due to the concentration quenching phenomenon. In addition, a composite was prepared by mixing MnWO4 powder, with enhanced magnetism and luminescence properties due to the addition of dysprosium, with epoxy. To one of the two prepared composites a magnetic field was applied to induce alignment of the MnWO4 particles. Aligned particles showed stronger luminescence than the composite sample prepared with unsorted particles. As a result of this, it was suggested that it can be used as phosphor and a photosensitizer by utilizing the magnetic and luminescent properties of the synthesized MnWO4 powder with the addition of rare earth ions.

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Photonic crystal membrane with single crystalline rare-earth oxide using selective area growth by MBE

2016 Compound Semiconductor Week (CSW) [Includes 28th International Conference on Indium Phosphide & Related Materials (IPRM) & 43rd International Symposium on Compound Semiconductors (ISCS) ◽

10.1109/iciprm.2016.7528793 ◽

2016 ◽

Author(s):

Takehiko Tawara ◽

Hiroo Omi ◽

Thomas McManus ◽

Aleix Llenas ◽

Eiichi Kuramochi ◽

...

Keyword(s):

Rare Earth ◽

Photonic Crystal ◽

Rare Earth Oxide ◽

Selective Area Growth ◽

Single Crystalline ◽

Selective Area ◽

Area Growth ◽

Photonic Crystal Membrane

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Effect of rare earth oxide CeO2 on the anodic bonding performance of PEG-based MEMS encapsulation materials

Advances in Mechanical Engineering ◽

10.1177/16878140211007712 ◽

2021 ◽

Vol 13 (3) ◽

pp. 168781402110077

Author(s):

Chao Du ◽

Cuirong Liu ◽

Xu Yin ◽

Haocheng Zhao

Keyword(s):

Tensile Strength ◽

Rare Earth ◽

Rare Earth Oxide ◽

Solid Polymer Electrolytes ◽

Anodic Bonding ◽

Solid Polymer ◽

Bonding Layer ◽

Scanning Calorimetry ◽

Ion Migration ◽

Bonding Performance

Herein, we synthesized a new polyethylene glycol (PEG)-based solid polymer electrolyte containing a rare earth oxide, CeO2, using mechanical metallurgy to prepare an encapsulation bonding material for MEMS. The effects of CeO2 content (0–15 wt.%) on the anodic bonding properties of the composites were investigated. Samples were analyzed and characterized by alternating current impedance spectroscopy, X-ray diffraction, scanning electron microscopy, differential scanning calorimetry, tensile strength tests, and anodic bonding experiments. CeO2 reduced the crystallinity of the material, promoted ion migration, increased the conductivity, increased the peak current of the bonding process, and increased the tensile strength. The maximum bonding efficiency and optimal bonding layer were obtained at 8 wt% CeO2. This study expands the applications of solid polymer electrolytes as encapsulation bonding materials.

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