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.

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.

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.

A highly-efficient blue-light excitable red phosphor: intramolecular π-stacking interactions in one dinuclear europium(iii) complex

2016 ◽  
Vol 45 (7) ◽  
pp. 2839-2844 ◽  
Author(s):  
Zhengliang Wang ◽  
Hui Yang ◽  
Pei He ◽  
Yonghui He ◽  
Jishou Zhao ◽  
...  
Keyword(s):  
Blue Light ◽  
Stacking Interactions ◽  
Red Phosphor ◽  
Red Emission ◽  
Highly Efficient ◽  
Π Stacking ◽  
Light Excitation

The europium(iii) complex [Eu2(2,7-BTFDBC)(DBM)4(Phen)2] with multiple T-shaped and parallel-displaced π-stacking interactions exhibits intense red emission under blue light excitation with high colour purity.

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.

Co-precipitation synthesis and photoluminescence properties of BaTiF6:Mn4+: an efficient red phosphor for warm white LEDs

2018 ◽  
Vol 6 (1) ◽  
pp. 127-133 ◽  
Author(s):  
Yong Liu ◽  
Guojun Gao ◽  
Lin Huang ◽  
Yiwen Zhu ◽  
Xuejie Zhang ◽  
...  
Keyword(s):  
Emission Line ◽  
Photoluminescence Properties ◽  
Broad Absorption ◽  
Red Phosphor ◽  
White Leds ◽  
Blue Region ◽  
Precipitation Synthesis ◽  
Co Precipitation ◽  
Sharp Emission Line

BaTiF6:Mn4+: a fluoride-based red phosphor with a sharp emission line and broad absorption in the blue region used for warm WLEDs.

Preparation of highly luminescent BaSO4 protected CdTe quantum dots as conversion materials for excellent color-rendering white LEDs

2015 ◽  
Vol 3 (12) ◽  
pp. 2831-2836 ◽  
Author(s):  
Yajing Chang ◽  
Xudong Yao ◽  
Zhongping Zhang ◽  
Danlu Jiang ◽  
Yalan Yu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Cdte Quantum Dots ◽  
Precipitation Method ◽  
White Leds ◽  
Conversion Materials ◽  
Co Precipitation ◽  
Color Rendering ◽  
First Time ◽  
Excellent Color ◽  
Inorganic Matrix

For the first time, colloidal CdTe quantum dots are incorporated into an inorganic matrix, BaSO4, through a co-precipitation method.

Synthesis and photoluminescence properties of a new blue-light-excitable red phosphor Ca2LaTaO6:Eu3+ for white LEDs

2020 ◽  
Vol 222 ◽  
pp. 117173 ◽  
Author(s):  
Zongjie Zhang ◽  
Liangling Sun ◽  
Balaji Devakumar ◽  
G. Annadurai ◽  
Jia Liang ◽  
...  
Keyword(s):  
Blue Light ◽  
Photoluminescence Properties ◽  
Red Phosphor ◽  
White Leds

Study on Luminescent Properties of YAG:Ce3+, Gd3+/La3+ Prepared by Co-Precipitation Method

2014 ◽  
Vol 1002 ◽  
pp. 29-34
Author(s):  
Rong Feng Guan ◽  
Ya Jun You ◽  
Juan Song ◽  
Gui Hua Hou
Keyword(s):  
Emission Intensity ◽  
Room Temperature ◽  
Thermal Quenching ◽  
Luminescent Properties ◽  
Ammonium Bicarbonate ◽  
Color Temperature ◽  
Precipitation Method ◽  
Structure Morphology ◽  
Relative Emission Intensity ◽  
Co Precipitation

The YAG:Ce3+, Gd3+/La3+ yellow phosphors were prepared by co-precipitation method with 0.1mol/L ammonium bicarbonate and aqueous ammonia as precipitants, and the crystal structure, morphology, luminescent properties were investigated. The results indicated that the emission peaks of the YAG:Ce3+, Gd3+/La3+ were redshifted from 535nm to 545.5nm /547nm, and the relative emission intensity declined from 330nm to 145/132 with doping content of Gd3+ /La3+ increased from 0 to 0.9mol at room temperature. Compared with Gd-doping phosphors, the redshift of La3+-doping phosphor was larger and the relative emission intensity declined more quickly. Compared with YAG:Ce3+, the thermal quenching characteristics of YAG:Ce,Gd and YAG:Ce,La were noticeably worse when the temperature increased, but the extents of peak wavelength redshifts were almost the same, about is 7-8nm in the experimental temperature range (50-200°C), have little relation with the doping concentration change. Doping concentrations of Gd or La couldn't be too high, and the suitable concentration was less than 0.6mol at the regulating color temperature and color index.

scholarly journals Preparation and photoluminescence study of Alumin o-boro silicate YAG fluorescent glass for White LED

2021 ◽  
Author(s):  
Chao Yang ◽  
Guohua Song ◽  
Jianwen Miao ◽  
Tingting Fan
Keyword(s):  
Light Emitting Diode ◽  
Emission Spectra ◽  
Precipitation Method ◽  
Excitation Spectra ◽  
Fluorescence Excitation ◽  
Light Emitting ◽  
White Leds ◽  
Near Ultraviolet ◽  
Fluorescence Excitation Spectra ◽  
Co Precipitation

Abstract The YAG: Eu 3+ fluorescent glass for NUV(near ultraviolet) white LEDs was obtained firstly by synthesizing Y 3 Al 5 O 12 (YAG): Eu 3+ precursors through a simple co-precipitation method, and then mixing precursor with B 2 O 3 -Al 2 O 3 -SiO 2 -Na 2 O-BaO glass powder calcined at 1400°C for 2.5 hours. The as-prepared YAG glass-ceramic phosphor was investigated by DTA, XRD, SEM, and photoluminescence (PL). Influence of YAG: Eu 3+ precursor and Eu 3+ doping on excitation and emission spectra also have been studied. The results show that: the phosphor's emission peak located at 393nm is correspond to the 7 F 0 - 5 L 6 transition of Eu 3+ ions, which matches good with UV LED chips; the phosphor gives intense emission at 593nm originating from the 5 D 0 - 7 F 1 transition of Eu 3+ ions. When the YAG precursor is 0.9g and amount of Eu 3+ doped is 0.08, the fluorescence excitation spectra of glass and emission spectra of the peak intensity reach its maximum value. The YAG: Eu 3+ fluorescence glass could be a promising material for the production of near ultraviolet chip white light-emitting diode.

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