Preparation and luminescent properties of persistent luminescent materials ZnGa2O4:Cr3+ by sol-gel-combustion

Optik ◽  
2021 ◽  
Vol 231 ◽  
pp. 166316
Author(s):  
Pinghui Ge ◽  
Kangning Sun ◽  
Hongye Li ◽  
Xuetao Yue
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Gel Combustion

Synthesis of Zn0.2Ca0.8TiO3:0.1Pr3+ by Sol-Gel and its Luminescence Characterization

2013 ◽  
Vol 750-752 ◽  
pp. 877-880
Author(s):  
Yi Shen ◽  
Li Ying Han ◽  
Lu Yao Hou
Keyword(s):  
Treatment Process ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Ultra Violet ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Excitation Spectra ◽  
Surface Appearance ◽  
Calcination Temperatures ◽  
Characteristic Emission

The Zn0.2Ca0.8TiO3:0.1Pr3+ luminescent materials were prepared by sol-gel technology. The phase transformation of gel was studied by TG-DTA and XRD in heat treatment process. The luminescent properties of phosphor in different calcination temperatures were determined by fluorescence spectrophotometer, and then the best sintering temperature was confirmed. The luminescent properties of phosphor was obtained through the emission/ excitation spectra. The surface appearance measured with SEM. The results showed that the nanoZn0.2Ca0.8TiO3:0.1Pr3+ phosphor could be obtained by sol-gel, sintering at 900°C. It sent out red fluorescent under the Ultra Violet. This characteristic emission peak at 614nm is associated with the typical 1D23H4 transition of Pr3+ion.

Synthesis and Luminescent Properties of CaSnO3:Eu Nanopowder Prepared by a Sol–Gel Route

2016 ◽  
Vol 16 (4) ◽  
pp. 3865-3868 ◽  
Author(s):  
Xiaoyan Fu ◽  
Tuyuan Zhao ◽  
Yan Zhang ◽  
Yibin Chen ◽  
Hongwu Zhang
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Potential Candidate ◽  
Excitation Band ◽  
Transfer Energy ◽  
High Quality ◽  
Red Emission ◽  
Red Phosphors ◽  
The Eu

Luminescent properties of nanocrystalline CaSnO3:1%Eu have been investigated in order to develop novel red phosphors. The results indicate that high-quality nanoparticles with controlled stoichiometry and microstructure were prepared by a sol–gel method using citric acid and EDTA as complexes. There are two broad excitation bands located at 240 and 270 nm existing in the excitation spectrum in addition to the characteristic excitation peaks of Eu3+. Further investigations show that the excitation band located at 240 nm can be assigned to the host absorption while the Eu–O charge transfer is responsible for the 270 nm excitation band. These results indicate that the host can efficiently transfer energy to the Eu3+ ions. The more important is that since the symmetry of Eu3+ ions is lower, the pure red emission (5D0 → 7F2 transition located at 618 nm) is predominant over all the emission. This mean CaSnO3:Eu is a potential candidate for red luminescent materials.

Synthesis of Ba2SiO4:Eu2+ by a Hybrid Process and Its Luminescent Properties

2015 ◽  
Vol 15 (10) ◽  
pp. 8155-8160 ◽  
Author(s):  
Jung Hye Park ◽  
Wonsik Ahn ◽  
Young Jin Kim
Keyword(s):  
Colloidal Silica ◽  
Particle Distribution ◽  
Sol Gel ◽  
Green Emission ◽  
Luminescent Properties ◽  
Hybrid Process ◽  
Photoluminescence Spectra ◽  
Preparation Conditions ◽  
Gel Combustion ◽  
Silicon Sources

Ba2SiO4:Eu2+ powders were prepared using a sol–gel-combustion (hybrid) process with tetraethyl orthosilicate (TEOS) and colloidal silica (C-SiO2) as Si sources. The effects of the silicon sources and preparation conditions on phase formation and luminescent properties were investigated. The B2S:Eu2+ powders synthesized with TEOS were composed of the irregular particles, whereas C-SiO2 was more conducive to uniform particle distribution for the Ba2SiO4:Eu2+ powders, leading to the enhancement of the emission intensity. The photoluminescence spectra of the synthesized powders exhibited broad excitation bands spanning 250 to 450 nm, and strong green-emission bands, whose intensities and positions were heavily dependent on the concentration of Eu2+ and Sr2+ substituted for Ba2+ in Ba2SiO4.

Research of the Halogen Phosphate Green Luminescent Materials Prepared by Sol-Gel Microwave-Assisted

2013 ◽  
Vol 744 ◽  
pp. 417-421 ◽  
Author(s):  
Tao Jiang ◽  
Ze Wu ◽  
Chao Guo ◽  
Jian Li ◽  
Yan Qun Cui
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Luminescent Materials ◽  
Luminescent Material ◽  
Reaction Conditions ◽  
Microwave Assisted ◽  
Structure And Morphology ◽  
Luminescent Spectroscopy ◽  
Optimum Reaction ◽  
Microwave Time

In this paper, we used the sol-gel method to get the green luminescent material precursors and prepared the Sr5(PO4)3Cl: Tb3+, Tm3+ green luminescent material by microwave-assisted sintering. Then we have studied the effects of different microwave time and power changes to samples structure and morphology, the effects of different halogen changes to samples structure and morphology, and the effects of different doping concentration and Halogen changing to luminescent properties. Using the X-ray diffractometer we study the samples crystal structure and survey the morphology and size by the scanning electron microscopy. Through the luminescent spectroscopy study the effects of Halogen changing. The results shows that: the optimum reaction conditions are microwave-assisted sinter at 800W for 60 min. Using F, Cl , Br three halogen prepared a halogen phosphate luminescent material, optimal luminous intensity are chlorine phosphate.

Perovskite gels combustion synthesis from rare earth aluminates. Development of multifuncional properties.

MRS Advances ◽  
2020 ◽  
Vol 5 (62) ◽  
pp. 3301-3313
Author(s):  
A. Barrera ◽  
M.L. Chávez ◽  
E. Chavira ◽  
T.A. García ◽  
J.M.E. Carreto
Keyword(s):  
Particle Size ◽  
Rare Earth ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Combustion Method ◽  
Ceramic Pigments ◽  
Material Development ◽  
Gel Combustion ◽  
Gel Combustion Method ◽  
Paramagnetic Properties

AbstractThe purpose of this work was the synthesis of the perovskites with rare earth, by gel combustion method with pigmenting, magnetic and luminescent properties. The synthesis of perovskite structure is important for material development, with multi features. In this work, the synthesis was from metal oxides by the method of combustion of gels at 500 °C, for 10 s. Color of perovskites obtained, with nanometric particle size (31-44 nm) was analysed by CIEL*a*b* with tonalities ranged from white to pink except for Pr-perovskites with yellow and brown. Its paramagnetic properties were verified by magnetic susceptibility. Its luminescence was at 260 nm, except for Pr-perovskites. This work opens an important opportunity to develop ceramic pigments with perovskites structures integrating other properties as luminescence and paramagnetism by combustion sol-gel method.

Synthesis and Luminescent Properties of Pr3+ Activated KNbO3 Phosphors by Sol-Gel Combustion Process

2013 ◽  
Vol 873 ◽  
pp. 783-786 ◽  
Author(s):  
Jun Ji Zhang ◽  
Hui Zhou ◽  
Ji Shi Chen ◽  
Ting Tang ◽  
Yuan Zheng Hao
Keyword(s):  
Particle Size ◽  
Single Phase ◽  
Sol Gel ◽  
Combustion Process ◽  
Luminescent Properties ◽  
Phase Evolution ◽  
Combustion Method ◽  
Treatment Temperature ◽  
Nanoscale Particles ◽  
Gel Combustion

Praseodymium doped KNbO3 (KNbO3:Pr) phosphors were synthesized by a facile solgel combustion method. Phase evolution, particle size and luminescent properties of the powders synthesized at various temperatures were investigated. Single-phase KNbO3:Pr nanoscale particles were obtained at 600°C by directly crystallizing from amorphous precursors. The particle size of KNbO3:Pr powders can be well controlled by varying the heat treatment temperature. Under the excitation of 450 nm, KNbO3:Pr phosphors showed the well-known Pr3+ emissions associated with the 4f inter-level electronic transitions in Pr3+ ions.

SOL–GEL COMBUSTION SYNTHESIS AND LUMINESCENT PROPERTIES OF NANOCRYSTALLINE Y3Al5O12:Eu3+ PHOSPHORS

2010 ◽  
Vol 17 (01) ◽  
pp. 73-79 ◽  
Author(s):  
YE RAN JUNG ◽  
HYUN KYOUNG YANG ◽  
BYUNG KEE MOON ◽  
BYUNG CHUN CHOI ◽  
JUNG HYUN JEONG ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Sol Gel ◽  
Luminescent Properties ◽  
Precipitation Method ◽  
Photoluminescence Spectra ◽  
Conventional Solid State Reaction ◽  
Sol Gel Process ◽  
Gel Combustion ◽  
Powder Samples ◽  
Co Precipitation

Nanosized YAG:Eu 3+ powder samples were synthesized by using co-precipitation method and combining stoichiometric ratios of Y ( NO 3)3 · 6 H 2 O , Eu ( NO 3)3 · 5 H 2 O , Al(OR) 3. After sintering at the temperature of 900°C for 3 h, YAG:Eu 3+ nanoparticles with single phase were obtained. In comparison with the conventional solid-state reaction process, this sol–gel process not only decreased the temperature required for synthesizing YAG:Eu 3+ powder, but also reduced their particle size to the nanometer range. The crystallinity, surface morphology and photoluminescent characteristics of phosphors were investigated by using X-ray diffraction (XRD), scanning electron microscopy (SEM) and luminescence spectrophotometer, respectively. The size of the nanocrystalline materials was found to increase from 33.66 to 51.70 nm with the annealing temperature increasing from 900° to 1100°C. The photoluminescence spectra shows the emissions radiated by the transitions from 5 D 0 excited states to 7 F J (J = 1, 2) states of Eu 3+ ions. The crystallinity, surface morphology and photoluminescence spectra of phosphors were highly dependent on the sintering temperature.

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