scholarly journals Preparation of Compensation Ions Codoped SrTiO3:Pr3+ Red Phosphor with the Sol-Gel Method and Study of Its Luminescence Enhancement Mechanism

2014 ◽  
Vol 2014 ◽  
pp. 1-9
Author(s):  
Dan Guo ◽  
Xiaodong Zhang ◽  
Jiangni Yun
Keyword(s):  
Electric Field ◽  
Sol Gel ◽  
Spectral Characteristics ◽  
Charge Compensation ◽  
Cubic Phase ◽  
Red Phosphor ◽  
Luminescence Enhancement ◽  
Gel Method ◽  
Sol Gel Method ◽  
Enhancement Mechanism

SrTiO3:Pr3+ is the most representative titanate matrix red phosphor for field emission display (FED). The red luminous efficiency of SrTiO3:Pr3+ will be greatly improved after the compensation ions codoping, so SrTiO3:Pr3+ red phosphor has been a research focus at home and abroad. SrTiO3:Pr3+, SrTiO3:Pr3+, Mg2+, and SrTiO3:Pr3+, Al3+ phosphors are synthesized by a new sol-gel method. Crystal structure, spectral characteristics, and luminescence enhancement mechanism of the sample were studied by XRD and PL spectra. The results showed that after co-doped, SrTiO3:Pr3+ phosphor is single SrTiO3 cubic phase, the main emission front is located at 614 nm, corresponding to Pr3+ ions 1D2→3H4 transition emission. SrTiO3:Pr3+, Mg2+ and SrTiO3:Pr3+, Al3+ phosphor luminescence intensity is enhanced, but the main luminescence mechanism is not changed. Acceptor impurity x = Mg2+, Al3+ will replace Ti bit after being doped into the crystal lattice to form XTi- charge compensation corresponding defect centers PrSr+ to reduce the demand of Sr2+ or Ti3+ vacancy. While Sr-doped Pr will make lattice distortion and transition energy of 4f-5d is very sensitive to crystal electric field changes around Pr atom. Doping different impurities will make electric field distribution around the icon have a different change. It increases energy transfer of 4f-5d transition and improves the luminous intensity of SrTiO3:Pr3+ red phosphor.

Effect of replacement of Ca by Zn on the structure and optical property of CaTiO 3 :Eu 3+ red phosphor prepared by sol‐gel method

Luminescence ◽  
2014 ◽  
Vol 30 (5) ◽  
pp. 533-537 ◽  
Author(s):  
Yulong Wang ◽  
Wentao Zhang ◽  
Peicong Zhang ◽  
Junfeng Li ◽  
Jianping Long
Keyword(s):  
Optical Property ◽  
Sol Gel ◽  
Red Phosphor ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Synthesis and Luminescent Properties of Red Phosphor Na1.8Zn2.1(MoO4)3Eu by Sol-Gel Method

2014 ◽  
Vol 26 (9) ◽  
pp. 2537-2540
Author(s):  
Jianfu Zhang ◽  
Hui Zhang ◽  
Ke Ran Geng ◽  
Zhen Ling Wang
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Red Phosphor ◽  
Gel Method ◽  
Sol Gel Method

SOL-GEL METHOD AND LUMINESCENCE PROPERTIES OF THE ZrO2:Eu3+PHOSPHORS WITH DIFFERENT CHARGE COMPENSATION

2016 ◽  
Vol 120 (4) ◽  
pp. 581-587
Author(s):  
J. S. Liao ◽  
S. H. Liu ◽  
L. L. Nie ◽  
B. Liu ◽  
S. J. Liu ◽  
...  
Keyword(s):  
Sol Gel ◽  
Charge Compensation ◽  
Luminescence Properties ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals Nanomaterial Host Bands Effect on the Photoluminescence Properties of Ce-Doped YAG Nanophosphor Synthesized by Sol-Gel Method

2015 ◽  
Vol 2015 ◽  
pp. 1-10 ◽  
Author(s):  
L. Guerbous ◽  
A. Boukerika
Keyword(s):  
Energy Levels ◽  
Sol Gel ◽  
Yellow Emission ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Annealing Temperatures

Cerium trivalent (Ce3+) doped YAG nano-sized phosphors have been successfully synthesized by sol-gel method using different annealing temperatures. The samples have been characterized by X-ray diffraction (XRD), thermogravimetry (TG), differential scanning calorimetry (DSC) analysis, Fourier transform infrared (FTIR) spectroscopy, and steady photoluminescence (PL) spectroscopy. X-ray diffraction analysis indicates that the pure cubic phase YAG was formed and strongly depends on the cerium content and the annealing temperature. It was found that the grain size ranges from 30 to 58 nm depending on the calcination temperature. The YAG: Ce nanophosphors showed intense, green-yellow emission, corresponding to Ce3+5d1→2F5/2,2F7/2transitions and its photoluminescence excitation spectrum contains the two Ce3+4f1→5d1, 5d2bands. The crystal filed splitting energy levels positions 5d1and 5d2and the emission transitions blue shift with annealing temperatures have been discussed. It was found that the Ce3+4f1ground state position relative to valence band maximum of YAG host nanomaterial decreases with increasing the temperature.

Synthesis of a New Red Long Persistent Phosphor Sr2ZnSi2O7: Eu3+, Lu3+ via Sol–Gel Method and Investigation of its Luminescence

2011 ◽  
Vol 393-395 ◽  
pp. 362-365
Author(s):  
Hua Lin ◽  
A Xiao Xu ◽  
Guo Liang Chen ◽  
Zi Shan Zheng ◽  
Heng Lin ◽  
...  
Keyword(s):  
Uv Light ◽  
Sol Gel ◽  
Trap Depth ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Gel Method ◽  
Sol Gel Method ◽  
Long Afterglow ◽  
Uv Light Irradiation ◽  
Luminescent Centers

A novel red long persistent phosphor of Sr2ZnSi2O7: Eu3+, Lu3+ was successfully synthesized with sol–gel method. Its properties were systematically characterized by X-ray diffraction(XRD), luminescence, afterglow decay curves and thermoluminescence (TL) spectra. The red phosphor showed one emission peak at 616.9nm, which is attributed to the typical 5D0–7F2 transition of Eu3+ ions as luminescent centers in Sr2ZnSi2O7 host. Lu3+ as a sensitized ion played an important role in enhancing the long afterglow performance of Sr2ZnSi2O7: Eu3+, Lu3+. Under UV light irradiation, this phosphor showed obvious red long-lasting phosphorescence that can be clearly seen with naked eyes in a dark room for over 20s after the irradiation source has been removed. Thermoluminescence (TL) measurement showed that Lu3+ co-dopan can reduce the trap depth of the title phosphor to obtain suitable ones.

Significant enhancement of luminescence intensity of CaTiO3:Eu3+ red phosphor prepared by sol–gel method and co-doped with Bi3+ and Mg2+

2012 ◽  
Vol 64 (2) ◽  
pp. 315-323 ◽  
Author(s):  
Pu-jun Zeng ◽  
Li-ping Yu ◽  
Zhong-xian Qiu ◽  
Ji-lin Zhang ◽  
Chun-ying Rong ◽  
...  
Keyword(s):  
Luminescence Intensity ◽  
Sol Gel ◽  
Significant Enhancement ◽  
Red Phosphor ◽  
Gel Method ◽  
Sol Gel Method ◽  
Co Doped

Preparation and Properties of Ni-Si-O Thin Film Prepared by Sol-Gel Method

2007 ◽  
Vol 336-338 ◽  
pp. 799-801
Author(s):  
Rong Juan Zhao ◽  
Yuan Hua Lin ◽  
Jing Nan Cai ◽  
Ce Wen Nan ◽  
Dan Xie
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Electrical Property ◽  
Electric Field ◽  
Sol Gel ◽  
Si Substrate ◽  
Gel Method ◽  
Sol Gel Method

Ni-Si-O thin films on Si substrate have been prepared by a sol-gel method. The microstructure and phase composition of the films were investigated by XRD, SEM, FTIR. The XRD results showed that the films are amorphous while annealed at 800oC for 10 min, the SEM imagines proved that the films are smooth and thickness is about 190 nm. Electrical property of the film indicated that the leakage current was as low as 10-6A/cm2 at an electric field of 1MV/cm. The dielectric properties of Ni-Si-O thin films can be improved as increasing the annealed temperature.

Stabilization of cubic phase in scandium‐doped zirconia nanocrystals synthesized with sol‐gel method

2018 ◽  
Vol 102 (6) ◽  
pp. 3236-3243 ◽  
Author(s):  
Alexander Sobolev ◽  
Albina Musin ◽  
Gene Whyman ◽  
Konstantin Borodianskiy ◽  
Olga Krichevski ◽  
...  
Keyword(s):  
Sol Gel ◽  
Cubic Phase ◽  
Gel Method ◽  
Sol Gel Method

scholarly journals The effect of Ba/Sr ratio on the Curie temperature for ferroelectric barium strontium titanate ceramics

2020 ◽  
Vol 10 (05) ◽  
pp. 2050021
Author(s):  
Hamed A. Gatea ◽  
Iqbal S. Naji
Keyword(s):  
Electric Field ◽  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Sol Gel ◽  
Dielectric Measurement ◽  
Dielectric Measurements ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method ◽  
Barium Strontium

The powders of lead-free material namely (nonhazardous) barium strontium titanate (BST) with different stoichiometric compositions have been synthesized by the sol–gel method. Ba[Formula: see text]Sr[Formula: see text]TiO3 (BST) materials possess the properties of both ferroelectric and dielectric materials. These materials have spontaneous polarization that can be reversed by an applied electric field and they remain polarized even when the applied external electric field is removed. Synthesized samples have been subjected to structural, morphological, and dielectric characterizations. In this study, BST nanopowders with different substitutions of [Formula: see text] (where [Formula: see text]= 0.2, 0.3, 0.4, 0.5, and 0.6) were prepared by the sol–gel method, which is an easy method with low power consumption and low temperature requirement and produces higher yield. Nanopowders had average particle sizes of 12–24 nm and particles sizes after sintering at 1000[Formula: see text]C for 3 h were 197, 267, 79.80, 63.09, and 63 nm. All resulting pellets had a polycrystalline structure. Crystal structure, space group, morphological characterization, and particle size were determined from the structural analysis using X-ray powder diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), and scanning electron microscopy (SEM). The dielectric measurements were made for BST pellets under different frequencies (1–200 kHz) from room temperature to 250[Formula: see text]C. The dielectric constants for the bulk were 743, 1566, 1091, 766, and 626 for [Formula: see text]= 0.2, 0.3, 0.4, 0.5, and 0.6, respectively. From dielectric measurements, samples with [Formula: see text]= 0.2 and 0.3 had the Curie temperatures of 70[Formula: see text]C and 28.5[Formula: see text]C, respectively, and remained intact below 0[Formula: see text]C. The sample with [Formula: see text]= 0.3 had a good dielectric measurement and moderate dissipation factor; it may be used in capacitance application as energy stores.

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