Tunable photoluminescent properties of rare-earth co-doped (Na0.5Bi0.5)TiO3 ceramics by Pr3+ concentration

2019 ◽  
Vol 33 (26) ◽  
pp. 1950323
Author(s):  
Chongjun He ◽  
Yang An ◽  
Chenguang Deng ◽  
Xiaorong Gu ◽  
Jiming Wang ◽  
...  
Keyword(s):  
Piezoelectric Materials ◽  
Optoelectronic Devices ◽  
Ceramic Materials ◽  
Infrared Region ◽  
Inhibitory Effect ◽  
Lead Free ◽  
Infrared Light ◽  
Environmental Friendliness ◽  
Luminescent Spectra ◽  
Co Doped

Lead-free piezoelectric ceramic materials have received extensive attention due to their potential application in new optoelectronic devices. The outstanding advantages of lead-free piezoelectric materials are nontoxicity and environmental-friendliness. Photoluminescence is one of the important properties of ceramics. This property is widely used in printing, testing materials, medical and other technologies. At the same time, materials with up-conversion luminescence can also be used to detect infrared light. Here, we had made [Formula: see text] and [Formula: see text] co-doped [Formula: see text] (NBT) ceramics. Photoluminescence properties of [Formula: see text] and [Formula: see text] co-doped NBT were studied. The structure of the doped ceramics was characterized by the X-ray diffraction pattern which shows that the doping had little effect on the ceramic structure. Studies on luminescent spectra show that [Formula: see text] has an inhibitory effect on the up-conversion luminescence of [Formula: see text], and a certain concentration of [Formula: see text] promotes the luminescence of [Formula: see text] in the mid-infrared region. Intensity of the up-conversion luminescence was substantially linear with the power of the excitation source. These findings are expected to improve the performance of the NBT-based optoelectronic devices.

Phase diagram determination of large piezoelectric response in BHT-BCT ceramics

2019 ◽  
Vol 12 (05) ◽  
pp. 1950070 ◽  
Author(s):  
Zhonghua Dai ◽  
Dingyan Li ◽  
Jinglong Xie ◽  
Weiguo Liu ◽  
Shaobo Ge ◽  
...  
Keyword(s):  
Phase Diagram ◽  
High Performance ◽  
Piezoelectric Properties ◽  
Piezoelectric Materials ◽  
Electronic Devices ◽  
Lead Free ◽  
Piezoelectric Response ◽  
Cubic Phases ◽  
Co Doped

High-performance lead-free piezoelectric materials are environmentally friendly and in great demand for electronic devices. In this study, the phase diagram and properties of Hf, Ca co-doped BaTiO3 (BHT-BCT) were investigated. A triple-point morphotropic phase boundary separating the rhombohedral, tetragonal and cubic phases for the (1-[Formula: see text])Ba(Ti0.85Hf0.15)O3-[Formula: see text](Ba0.7Ca0.3)TiO3 system exited at [Formula: see text] High piezoelectric properties with piezoelectric coefficients [Formula: see text] (572pC/N) and Curie temperature [Formula: see text] (90∘C) of 0.55Ba(Ti0.85Hf0.15)O3-0.45(Ba0.7Ca0.3)TiO3 are achieved in the BaTiO3-based ceramics.

Lead-free halide double perovskites: Toward stable and sustainable optoelectronic devices

2021 ◽  
Author(s):  
Asia Bibi ◽  
Ilgeum Lee ◽  
Yoonseo Nah ◽  
Omar Allam ◽  
Heejun Kim ◽  
...  
Keyword(s):  
Optoelectronic Devices ◽  
Lead Free ◽  
Double Perovskites

Optical Characterization of CdSe Colloidal Quantum Dot/ MEH-PPV Polymer Nanocomposites Spin-cast on GaAs Substrates

2006 ◽  
Vol 939 ◽  
Author(s):  
Adrienne D. Stiff-Roberts ◽  
Abhishek Gupta ◽  
Zhiya Zhao
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Optoelectronic Devices ◽  
Photogenerated Electron ◽  
Polymer Nanocomposite ◽  
Colloidal Quantum Dots ◽  
Infrared Light ◽  
Gaas Substrates ◽  
Conducting Polymer Nanocomposite ◽  
Colloidal Quantum Dot

ABSTRACTThe motivation and distinct approach for this work is the use of intraband transitions within colloidal quantum dots for the detection of mid- (3-5 μm) and/or long-wave (8-14 μm) infrared light. The CdSe colloidal quantum dot/MEH-PPV conducting polymer nanocomposite material is well-suited for this application due to the ∼1.5 eV difference between the corresponding electron affinities. Therefore, CdSe colloidal quantum dots embedded in MEH-PPV should provide electron quantum confinement such that intraband transitions can occur in the conduction band. Further, it is desirable to deposit these nanocomposites on semiconductor substrates to enable charge transfer of photogenerated electron-hole pairs from the substrate to the nanocomposite. In this way, optoelectronic devices analogous to those achieved using Stranski-Krastanow quantum dots grown by epitaxy can be realized. To date, there have been relatively few investigations of colloidal quantum dot nanocomposites deposited on GaAs substrates. However, it is crucial to develop a better understanding of the optical properties of these hybrid material systems if such heterostructures are to be used for optoelectronic devices, such as infrared photodetectors. By depositing the nanocomposites on GaAs substrates featuring different doping characteristics and measuring the corresponding Fourier transform infrared absorbance, the feasibility of these intraband transitions is demonstrated at room temperature.

The Characteristic of the La3Ga5SiO14 Single Crystal Grown by Vertical Bridgman Method in Ar Atmosphere

2006 ◽  
Vol 510-511 ◽  
pp. 842-845 ◽  
Author(s):  
Noriko Bamba ◽  
Kentaro Kato ◽  
Toshinori Taishi ◽  
Takayuki Hayashi ◽  
Keigo Hoshikawa ◽  
...  
Keyword(s):  
Melting Point ◽  
Single Crystal ◽  
Single Crystals ◽  
Room Temperature ◽  
Color Change ◽  
Piezoelectric Materials ◽  
Lead Free ◽  
Piezoelectric Constant ◽  
Interstitial Oxygen ◽  
Vertical Bridgman

Langasite (La3Ga5SiO14: denoted by LGS) single crystal is one of the lead free piezoelectric materials with high piezoelectricity that is maintained up to its melting point (1470°C). Although LGS single crystals have usually been grown by Czochralski (CZ) method in oxygen contained atmosphere to prevent evaporation of Ga, they were grown by the vertical Bridgman (VB) method in Ar atmosphere without oxygen, and their properties were evaluated in this work. Transparent and colorless LGS single crystals were successfully obtained without Ga evaporation by the VB method in Ar atmosphere, and their resistivity at room temperature was much higher than that grown by conventional CZ method. Piezoelectric constant d11 of the crystal grown by the VB method was 6 x 10-12 C/N, which was close to that of the crystal grown by CZ method. The colorless transparent LGS single crystal turned to orange and its resistivity decreased by annealing in air. Since an orange-colored transparent LGS single crystal has been grown by conventional CZ method, this indicates that color change and the resistivity decrease of LGS crystal is caused by extra interstitial oxygen atoms in the crystal.

(Li,F) co-doped ZnO: Optoelectronic devices applications

2020 ◽  
Vol 145 ◽  
pp. 106645
Author(s):  
M. Khuili ◽  
N. Fazouan ◽  
H. Abou El Makarim ◽  
E.H. Atmani ◽  
A. Abbassi ◽  
...  
Keyword(s):  
Optoelectronic Devices ◽  
Doped Zno ◽  
Co Doped

Evaluation of Static Performance of Optoelectronic Semiconductor Devices under X-Rays Irradiation

2010 ◽  
Vol 173 ◽  
pp. 1-6 ◽  
Author(s):  
Haider F. Abdul Amir ◽  
Fuei Pien Chee
Keyword(s):  
Ionizing Radiation ◽  
Light Emitting Diode ◽  
Optoelectronic Devices ◽  
Third Party ◽  
Infrared Light ◽  
X Rays ◽  
Total Ionizing Dose ◽  
Light Emitting ◽  
Static Performance ◽  
Current Drives

In this research, optoelectronic devices consisted of an infrared light emitting diode and a phototransistor with no special handling or third party-packaging were irradiated to ionizing radiation utilizing x-rays. It was found that the devices under test (DUTs) undergo performance degradation in their functional parameters during exposure to x-rays. These damaging effects are depending on their current drives and also the Total Ionizing Dose (TID) absorbed. The TID effects by x-rays are cumulative and gradually take place throughout the lifecycle of the devices exposed to radiation.

scholarly journals Synthesis and Characterization of Sn/Ni Single Doped and Co–Doped Anatase/Rutile Mixed–Crystal Nanomaterials and Their Photocatalytic Performance under UV–Visible Light

Catalysts ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1341
Author(s):  
Qin Qin ◽  
Juan Wang ◽  
Yangwen Xia ◽  
Daixiong Yang ◽  
Qin Zhou ◽  
...  
Keyword(s):  
Visible Light ◽  
Mixed Crystal ◽  
Inhibitory Effect ◽  
Reaction Rate Constant ◽  
Charge Recombination ◽  
Pure Tio2 ◽  
Ni Doping ◽  
Sn Doping ◽  
Co Doping ◽  
Co Doped

Pure and Sn/Ni co–doped TiO2 nanomaterials with anatase/rutile mixed crystal were prepared and characterized. The results show that pure TiO2 is a mixed crystal structure composed of a large amount of anatase and a small amount of rutile. Sn doping promotes the phase transformation from anatase to rutile, while Ni doping inhibits the transformation. Both single doping and co–doping are beneficial to the inhibition of photoinduced charge recombination. Sn doping shows the best inhibitory effect on photogenerated charge recombination, and increases the utilization of visible light, displaying the highest photocatalytic activity. The decolorization degree of methylene blue (MB) by Sn–TiO2 is 79.5% after 150 min. The reaction rate constant of Sn–TiO2 is 0.01022 min−1, which is 5.6 times higher than pure TiO2 (0.00181 min–1).

Research Development of Preparation Technology of BaTiO3 Nano-Power

2014 ◽  
Vol 809-810 ◽  
pp. 17-25
Author(s):  
Ming Chao Che ◽  
Jie Chen
Keyword(s):  
Barium Titanate ◽  
Piezoelectric Materials ◽  
Ceramic Materials ◽  
Dielectric Materials ◽  
Ferroelectric Materials ◽  
Preparation Technology ◽  
Developing Trend ◽  
Important Direction ◽  
Dielectric Ceramics ◽  
Synthesis Of Barium Titanate

Barium titanate (BaTiO3) used a strong dielectric materials, piezoelectric materials and ferroelectric materials, which is a kind of important electronic ceramic materials. With the miniaturization of electronic components, miniaturization, thin layer, nanosized barium titanate powder become an inevitable developing trend of barium titanate dielectric ceramics material. Some recent new progress for synthesis of barium titanate at home and abroad are summarized, the commentaries are made on the preparation process about advantages or disadvantages. Meanwhile, the analysis is made on the developing trend. Supercritical fluid extraction method have simple process, high extraction efficiency, no organic solvent residual, products of good quality, no environmental pollution, and so on. Research of BaTiO3nanopower may become an important direction of the field in the future.

Enhanced fatigue resistance and lattice dynamics induced by the strong local strain in Fe-doped KTa1-xNbxO3 single crystal

2021 ◽  
Author(s):  
Xiaolin Huang ◽  
Peng Tan ◽  
Yu Wang ◽  
Yao Zhang ◽  
Xiangda Meng ◽  
...  
Keyword(s):  
Single Crystal ◽  
Fatigue Resistance ◽  
Lattice Dynamics ◽  
Piezoelectric Materials ◽  
Local Strain ◽  
Lead Free ◽  
Fatigue Properties ◽  
Practical Applications ◽  
Local Structures ◽  
The Impact

Improvement of durability is greatly important for the practical applications of lead-free-doped piezoelectric materials. However, the promotional mechanism of anti-fatigue properties and the impact on local structures from ion dopants...

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