Synthesis and luminescence of Li2.06Nb0.18Ti0.76O3: Eu3+ Ceramics

2020 ◽  
Vol 13 (05) ◽  
pp. 2051030
Author(s):  
Xi Chen ◽  
Qun Zeng ◽  
Liu Lei ◽  
Chun-Feng Yao ◽  
Chao-Chao Guo ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Fluorescence Spectra ◽  
Sintering Temperature ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Red Emission ◽  
Reaction Method ◽  
Pl Spectra ◽  
Orange Emission

Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3: Eu[Formula: see text] luminescent ceramics were prepared by the solid-state reaction method. By means of XRD, SEM, density testing, and fluorescence spectra data, the luminescent ceramics were characterized as functions of Eu[Formula: see text] concentration and sintering temperature. With the increase of sintering temperature and Eu[Formula: see text] concentration, the peak intensities of the PLE spectra monitored at 612[Formula: see text]nm and PL spectra excited at 396[Formula: see text]nm were dramatically improved. Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3: 3[Formula: see text]wt.%Eu[Formula: see text] ceramics sintered at 1120∘C showed the highest PL intensity. The emission spectra showed orange emission at 592[Formula: see text]nm and red emission at 612[Formula: see text]nm, corresponding to the transition of 5D[Formula: see text]F1 and 5D[Formula: see text]F2 of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3: Eu[Formula: see text] ceramics.

Effects of Mg2SiO4 Addition on the Microstructure and Dielectric Properties of MgTiO3-CaTiO3 Ceramics

2013 ◽  
Vol 675 ◽  
pp. 200-204
Author(s):  
Fei Shi ◽  
Peng Cheng Du ◽  
Jing Xiao Liu ◽  
Ji Wei Wu ◽  
De Qing Chen ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Solid State ◽  
Dielectric Loss ◽  
Solid State Reaction ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Composite Ceramics ◽  
Reaction Method ◽  
Dielectric Ceramics

The Mg2SiO4-MgTiO3-CaTiO3 composite dielectric ceramics with different Mg2SiO4 addition amounts were prepared by solid state reaction method. The effects of Mg2SiO4 addition amounts on the microstructure and dielectric properties as well as sintering temperature of xMg2SiO4-(0.95-x)MgTiO3-0.05CaTiO3 (abbreviated as xMSTC, 0.25≦x≦0.75) composite ceramics were investigated. The results indicated that the sintering temperature of MgTiO3-CaTiO3 based ceramics with Mg2SiO4 addition could be lowered effectively to 1320~1340°C, and the dielectric constant decreased and dielectric loss increased gradually with the increase of Mg2SiO4 content. The 0.45MSTC ceramics containing 45 wt% Mg2SiO4 and sintered at 1340°C showed desirable dielectric properties with dielectric constant εr=13.3，dielectric loss tanδ=4.5×10-4 and temperature coefficient of relative permittivity τε =10 ppm/°C.

A new far-red emission from Zn2SnO4 powder synthesized by modified solid state reaction method

2020 ◽  
Vol 100 ◽  
pp. 109670 ◽  
Author(s):  
L.T.T. Vien ◽  
Nguyen Tu ◽  
Manh Trung Tran ◽  
Nguyen Van Du ◽  
D.H. Nguyen ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Red Emission ◽  
Reaction Method

Photoluminescence properties of Li2+xNb3xTi1−4xO3:Eu3+

2019 ◽  
Vol 12 (04) ◽  
pp. 1950057 ◽  
Author(s):  
Chao-Chao Guo ◽  
Qun Zeng ◽  
Chun-Feng Yao ◽  
Yan-Zhao Feng ◽  
Xi Chen ◽  
...  
Keyword(s):  
Solid State ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Red Emission ◽  
Reaction Method ◽  
X Ray ◽  
Red Phosphors ◽  
Chromaticity Coordinate

Red phosphors with compositions of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3:3[Formula: see text]wt.% Eu[Formula: see text] [Formula: see text] were synthesized by solid-state reaction method. The samples were investigated by using X-ray diffraction (XRD) and photoluminescence spectroscopy, respectively. XRD results showed that all samples were main phase of Li2TiO3. Emission spectra of Li[Formula: see text]Nb[Formula: see text]Ti[Formula: see text]O3:3[Formula: see text]wt.% Eu[Formula: see text] powders showed strong red emission at 612[Formula: see text]nm (5D0–7F[Formula: see text] with 396[Formula: see text]nm excitation. In addition, the excitation and emission intensity increased up to [Formula: see text], and then decreased with further increasing of the x values. And the chromaticity coordinate (CIE) of the component with [Formula: see text] was superior to other components.

Luminescence properties of newly developed red-emitting phosphors M2Si2O7:Eu3+ (M=La, Y) under UV/VUV excitation

2006 ◽  
Vol 916 ◽  
Author(s):  
Zhiya Zhang ◽  
Yuhua Wang
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Color Purity ◽  
Excitation Spectra ◽  
Reaction Method

AbstractThe red-emitting phosphors of Eu3+ doped M2Si2O7 (M=La, Y) were synthesized by a solid-state reaction method and their luminescence properties in UV-VUV region have been studied. On the excitation spectra, the Eu3+-O2- CT band is of higher intensity for La2Si2O7, while for Y2Si2O7, the absorption around 150nm is much stronger and this can be assigned to the Y3+-O2- CT band in company with the Si-O group absorption. The emission spectra show higher intensity and better color purity for La2Si2O7:Eu3+ under 254nm excitation due to Eu3+ occupying the non-centrosymmetric site. Under 147nm excitation, Y2Si2O7:Eu3+ exhibits stronger emission with purer red, which can be corresponded to the absorption of Y3+-O2- CT in the VUV region.

scholarly journals The Optical Properties of Dy3+ Doped LaPO4 Phosphors Prepared by Solid State Reaction Method

2021 ◽  
Vol 13 (3) ◽  
pp. 891-900
Author(s):  
C. A. Rao ◽  
K. Shakampally ◽  
K. V. R. Murthy
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Blue Emission ◽  
Emission Spectra ◽  
Solid State Reaction Method ◽  
Yellow Emission ◽  
Flat Panel Display ◽  
Excitation Spectra ◽  
Excitation Peak ◽  
Reaction Method

Luminescent nanomaterials are used in everyday life due to their employment in distinct fields of science and technology, like cathode ray tubes (CRTs), flat panel display devices, temperature sensors, lasers, solar-cells, biological imaging, and solid-state lighting but also as carriers for miscellaneous therapeutic drugs. We have prepared dysprosium Dy3+ (0.5 mol %) doped lanthanum phosphate (LaPO4) phosphor by solid state reaction method. The excitation spectra of synthesized phosphor at 595 nm monitoring were composed of broadband and a series of sharp peaks, the strongest excitation peak at 254, 271, and 350 nm. The main emission spectra of samples under 254, 271, and 350 nm excitation are Dy3+ (0.5 mol %) doped LaPO4 phosphor observed at 477 and 573 nm corresponding to blue and yellow color. The broadband emission is the characteristic of the allowed f-h transition of Dy3+ ions. The corresponding emission band is observed due to the (blue emission) 4f9/2→6h15/2, (yellow emission) 4f9/2→6h13/2 transition of Dy3+ ions.  All the samples have been characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and photoluminescence (PL) techniques.

Effect of Ti-Doped on Y134 Superconductor

2016 ◽  
Vol 851 ◽  
pp. 42-45
Author(s):  
Rattanasuda Supadanaison ◽  
Theerathawan Panklang ◽  
Chalit Wanichayanan ◽  
Warayut Srithongsuk ◽  
Jaturong Junrear ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Peritectic Temperature ◽  
Reaction Method ◽  
Melting Area ◽  
Ti Doping

We investigated some properties of Y134 superconductor doped Ti superconductor. The series of samples of Y134 doped Titanium (YBa3Cu4TixO9-δ) which x=0, 0.05, 0.10, 0.15, 0.20, 0.25 were prepared by solid state reaction method with calcinations and sintering temperature at 980 °C. The porosity was reduced and the melting area were found for all Ti-doped samples. There was a little effect of Ti-doped on Tc onset but the lower of Tc offset were found that agree with the melting found on surface of sample with Ti-doped. The peritectic temperature of Y134 powder, and Y134 + 0.10Ti were on the same range about with more peak area of pure Y134 than Y134 with Ti-doping.

Effect of the Doping Ni and Overdosing Lithium for Synthesis LiMn2O4 Cathode Material by the Solid State Reaction Method

2013 ◽  
Vol 457-458 ◽  
pp. 93-97
Author(s):  
Yen Chun Liu ◽  
Ming Cheng Liu ◽  
Robert Lian Huey Liu ◽  
Mao Chieh Chi
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Cathode Materials ◽  
Solid State Reaction ◽  
Lithium Battery ◽  
Sintering Temperature ◽  
Solid State Reaction Method ◽  
Attrition Rates ◽  
Reaction Method ◽  
Initial Capacity

The study with Li2CO3 and Mn3O4 through the solid state reaction makes cathode material for lithium battery spinel - LiMn2O4. According to past literature, under the solid-state reaction. The experiment carries out sintering at temperature of 850°C.. Cathode materials under these sintering temperatures are made to fabricate battery. For Ni doped LiMn2O4, the capacitance decreasing speed is slow and stable; after 15 times charging-discharging cycles, the attrition rates were 3.05 % or less. The result of experiment demonstrates that the best sintering temperature is at 850°C. Under the condition of 850°C, various contents for extra amount of lithium (1.02 mole-1.1 mole) are fabricated and range of working voltage is released. It is found a further increase of initial capacity to 140.51 mAh/g. LiMn2O4 further extends circulation and usage.

Enhanced red emission in Ca0.5La(MoO4)2:Eu3+ phosphors for UV LEDs

RSC Advances ◽  
2015 ◽  
Vol 5 (116) ◽  
pp. 95953-95959 ◽  
Author(s):  
Yurong Shi ◽  
Bitao Liu ◽  
Bo Liu ◽  
Chunyang Li ◽  
Zhenling Wang
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Chemical Formula ◽  
Red Emission ◽  
Reaction Method ◽  
Uv Leds

La3+ was introduced into CaMoO4 to form a novel compound with the chemical formula Ca0.5La(MoO4)2 and was synthesized by a solid-state reaction method.

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