Optical and thermal behaviors of high efficient K 2 TiF 6 :Mn 4+ red phosphor prepared by modified two-step co-precipitation method

2016 ◽  
Vol 83 ◽  
pp. 316-323 ◽  
Author(s):  
Miaomiao Du ◽  
Fei Tang ◽  
Jiaqi Long ◽  
Chaoyang Ma ◽  
Xuanyi Yuan ◽  
...  
Keyword(s):  
Precipitation Method ◽  
Thermal Behaviors ◽  
Red Phosphor ◽  
High Efficient ◽  
Co Precipitation

scholarly journals Synthesis and Characterization of the CaTiO3:Eu3+ Red Phosphor by an Optimized Microwave-Assisted Sintering Process

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 874
Author(s):  
Haifeng Wang ◽  
Jianwei Lu ◽  
Ruoxuan Wang ◽  
Yungu Dong ◽  
Linfeng Ding
Keyword(s):  
Red Light ◽  
Precipitation Method ◽  
Synthesis Process ◽  
Sintering Process ◽  
Time Saving ◽  
Red Phosphor ◽  
Microwave Assisted ◽  
Furnace Sintering ◽  
Co Precipitation

The synthesis process has a significant influence on the properties of Ca1-xTiO3:Eu3+x phosphors; thus, an optimized process will lead to a better performance of the Ca1-xTiO3:Eu3+x phosphors. In this work, the feasibility of synthesizing the Ca1-xTiO3:Eu3+x phosphor with a good luminescent performance by combining the chemical co-precipitation method and microwave-assisted sintering was studied. The precursor of Ca1-xTiO3:Eu3+x phosphors were prepared by the chemical co-precipitation method. To find an optimized process, we applied both of the traditional (furnace) sintering and the microwave-assisted sintering to synthesize the Ca1-xTiO3:Eu3+x phosphors. We found out that a sintering power of 528 W for 50 min (temperature around 950 °C) by a microwave oven resulted in similar emission intensity results compared to traditional furnace sintering at 900 °C for 2.5 h. The synthesized Ca1-xTiO3:Eu3+x phosphors has an emission peak at 617 nm (5D0→7F2), which corresponds to the red light band. This new synthesized method is an energy efficient, time saving, and environmentally friendly means for the preparation of Ca1-xTiO3:Eu3+x red phosphor with good luminescent performance.

Synthesis and warm-white LED applications of an efficient narrow-band red emitting phosphor, Rb2ZrF6:Mn4+

2017 ◽  
Vol 5 (29) ◽  
pp. 7253-7261 ◽  
Author(s):  
L. Y. Wang ◽  
E. H. Song ◽  
Y. Y. Zhou ◽  
T. T. Deng ◽  
S. Ye ◽  
...  
Keyword(s):  
Narrow Band ◽  
Precipitation Method ◽  
White Led ◽  
Red Phosphor ◽  
Yellow Phosphor ◽  
Co Precipitation ◽  
Red Emitting Phosphor

Phosphor Rb2ZrF6:Mn4+has been synthesizedviaa co-precipitation method. Series of WLEDs were fabricated by combining YAG:Ce3+yellow phosphor and different amount of Rb2ZrF6:Mn4+red phosphor with InGaN blue chips.

A strong zero-phonon line red phosphor BaNbF7:Mn4+ for white LEDs

2020 ◽  
Vol 7 (18) ◽  
pp. 3371-3378
Author(s):  
Yang Zhou ◽  
Xiaoming Wang ◽  
Cuiping Wang ◽  
Tian Zhang ◽  
Yonggang Wang ◽  
...  
Keyword(s):  
Blue Light ◽  
Emission Intensity ◽  
Precipitation Method ◽  
Zero Phonon Line ◽  
Red Phosphor ◽  
Phonon Line ◽  
White Leds ◽  
Light Excitation ◽  
Co Precipitation

A novel red fluoride phosphor BaNbF7:Mn4+ was synthesized by co-precipitation method. Under UV and blue light excitation, this phosphor shows strong ZPL emission intensity at 630 nm and which makes it an attractive red phosphor candidate for WLEDs.

The design and preparation of the thermally stable, Mn4+ ion activated, narrow band, red emitting fluoride Na3GaF6:Mn4+ for warm WLED applications

2017 ◽  
Vol 5 (11) ◽  
pp. 2910-2918 ◽  
Author(s):  
T. T. Deng ◽  
E. H. Song ◽  
J. Sun ◽  
L. Y. Wang ◽  
Y. Deng ◽  
...  
Keyword(s):  
Room Temperature ◽  
Narrow Band ◽  
Precipitation Method ◽  
Thermally Stable ◽  
Red Phosphor ◽  
Co Precipitation

Herein, a new red phosphor Na3GaF6:Mn4+ has been designed and synthesized by a facile two-step co-precipitation method at room temperature.

Co-Precipitation Synthesis and Photoluminescence Properties of Sc0.88Lu0.05(V1-xPx)O4:Eu3+0.07 Red Phosphor for White Light Emitting Diodes

2018 ◽  
Vol 914 ◽  
pp. 87-95
Author(s):  
Di Wu ◽  
Xin Yu Ye ◽  
Xin Hua Yang ◽  
Fan Liu ◽  
Jian Wen Zhao ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Emission Intensity ◽  
Doping Concentration ◽  
Internal Quantum Efficiency ◽  
The Body ◽  
Precipitation Method ◽  
Luminescence Spectra ◽  
Red Phosphor ◽  
Light Emitting ◽  
Co Precipitation

Sc0.88Lu0.05(V1-xPx)O4:Eu3+0.07(0≤x≤0.5) phosphors were synthesized by co-precipitation method. The structure, morphology and luminescence spectra of samples were investigated by XRD, SEM and fluorescence spectrophotometer, respectively. The samples doped with Eu3+, Lu3+and PO43-can maintain the body-centered tetragonal structure of ScVO4and the morphology essentially remains unchanged with slight agglomeration. The excitation spectrum intensity of Sc0.88Lu0.05(V1-xPx)O4:Eu3+0.07increase within the near UV excitation (360-410nm). The optimum doping concentration of PO43-is 0.2(x value), and the maximum emission intensity of Sc0.88Lu0.05(V0.8P0.2)O4:Eu3+0.07is about 35 % higher than the Sc0.88Lu0.05VO4:Eu3+0.07under 365 nm excitation. Decay curve of5D0state for as-prepared samples fits the single order exponential behavior, the lifetime of5D0increase first and then decrease with the increase of PO43-doping concentration. The internal quantum efficiency is up to 66.73% under 365nm excitation, When the temperature rises to 200°C, the emission intensity maintains 79.3% of that in the room temperature. Sc0.88Lu0.05(V0.8P0.2)O4:Eu3+0.07phosphor shows high internal quantum efficiency and thermal stability, which is suitable for the UV-pumped white LED as red phosphor.

Synthesis, Characterization and Photocatalytic Activities of Bismuth Vanadate by Facile Co-Precipitation Method

2010 ◽  
Vol 148-149 ◽  
pp. 1469-1472
Author(s):  
Chao Jun Liu ◽  
Yue Hua Xu
Keyword(s):  
Diffuse Reflectance Spectroscopy ◽  
Average Crystallite Size ◽  
Temperature Treatment ◽  
Precipitation Method ◽  
High Temperature Treatment ◽  
Synthesis Conditions ◽  
High Efficient ◽  
Photocatalytic Activities ◽  
Co Precipitation ◽  
Monoclinic Bivo4

Monoclinic BiVO4 photocatalysts were synthesized via facile and straightforward co-precipitation method at room temperature without high temperature treatment and characterized with X-ray diffraction (XRD), diffuse reflectance spectroscopy (DRS), flourier transfer infrared spectroscopy (FT-IR), Brunauer-Emmett-Teller (BET), and transmission electron microscopy (TEM). The results indicate that through proper selection of synthesis conditions, it is possible to obtain high efficient BiVO4 nanoparticles. The as-prepared monoclinic BiVO4 photocatalysts have an average crystallite size of about 20 nm with the particle size of about 20 to 50 nm. Their photocatalytic activities were evaluated by decolorization of rhodamine B in aqueous solution under visible light irradiation, and the relationship between the photocatalytic activity of BiVO4 and their physicochemical properties were investigated.

scholarly journals Simple Synthesis of NdFeO3 Nanoparticles By the Co-Precipitation Method Based on a Study of Thermal Behaviors of Fe (III) and Nd (III) Hydroxides

Crystals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 219 ◽  
Author(s):  
Tien A. Nguyen ◽  
V. Pham ◽  
Thanh L. Pham ◽  
Linh T. Tr. Nguyen ◽  
I. Ya. Mittova ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Coercive Force ◽  
Remanent Magnetization ◽  
Hot Water ◽  
Precipitation Method ◽  
Thermal Behaviors ◽  
Simple Process ◽  
Co Precipitation ◽  
Hydrolysis Of ◽  
Perovskite Type

In this study, a nanostructured NdFeO3 material was synthesized via a simple process of the hydrolysis of Nd (III) and Fe (III) cations in hot water with 5% NaOH as a precipitating agent. According to the results of the thermal behaviors of each hydroxide, either containing Fe (III) or Nd (III), the perovskite type of neodymium orthoferrite NdFeO3 was simply synthesized by annealing a mixture of Fe (III) and Nd (III) hydroxides at 750 °C. The nanostructured NdFeO3 was obtained in spherical granules with diameters of around 30 nm. The magnetic properties of the material were a coercive force (Hc) of 136.76 Oe, a remanent magnetization (Mr) of 0.68 emu·g–1, and a saturation magnetization (Ms) of 0.79 emu·g–1.

Photoluminescence properties and crystal structure of BaSiO3:xEu3+, yBi3+ red phosphor synthesized by co-precipitation method

2019 ◽  
Vol 556 ◽  
pp. 6-11 ◽  
Author(s):  
Lingxiang Yang ◽  
Da-chuan Zhu ◽  
Shasha Liu ◽  
Jin-shan Wang ◽  
Cong Zhao ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Precipitation Method ◽  
Photoluminescence Properties ◽  
Red Phosphor ◽  
Co Precipitation
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