Synthesis and Photoluminescence Properties of Sc0.88-xLu0.05VO4:Eu3+0.07,Bi3+x Red Phosphor

2017 ◽  
Vol 727 ◽  
pp. 604-611
Author(s):  
Di Wu ◽  
Xin Yu Ye ◽  
Xin Hua Yang ◽  
Jian Zhou ◽  
Xiao Qiang Wen ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Emission Intensity ◽  
Doping Concentration ◽  
Internal Quantum Efficiency ◽  
The Body ◽  
Luminescence Spectra ◽  
Intensity Increase ◽  
X Ray Diffraction ◽  
Red Phosphor ◽  
Red Phosphors

Sc0.88-xLu0.05VO4:Eu3+0.07,Bi3+x(0≤x≤0.05) red phosphors were synthesized by solid state reaction at 1200°C for 3h. The structure, morphology and luminescence spectra of samples are investigated by X-ray diffraction (XRD), Scanning electron microscope (SEM) and fluorescence spectrophotometer, respectively. The samples doped with Eu3+, Lu3+ and Bi3+ maintain the body-centered tetragonal structure of ScVO4 and the morphology remains essentially unchanged with slight agglomeration. The excitation spectrum of Sc0.88-xLu0.05VO4:Eu3+0.07,Bi3+x emerged redshift and the excitation intensity increase within the near UV excitation (360-400nm). The optimum doping concentration of Bi3+ is 0.02(x value), and the maximum emission intensity of Sc0.86Lu0.05VO4:Eu3+0.07,Bi3+0.02 is higher than 88 % in comparison with Sc0.88Lu0.05VO4:Eu3+0.07 under 365 nm excitation. Decay curve of 5D0 state for as-prepared samples fits the single order exponential behavior, the lifetime of 5D0 increase first and then decrease with the increase of Bi3+ doping concentration. The internal quantum efficiency is up to 74.08% under 365nm excitation; When the temperature raises to 200°C, the emission intensity maintains 79% of that in the room temperature. Sc0.86Lu0.05VO4:Eu3+0.07,Bi3+0.02 phosphor show high internal quantum efficiency and thermal stability, which is suitable for the UV-pumped white LED as red phosphor.

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.

Micro-sized K2SiF6:Mn4+ red phosphors for light emitting diodes synthesized by a simple method

2016 ◽  
Vol 10 (03) ◽  
pp. 1750016 ◽  
Author(s):  
Yurong Shi ◽  
Wan Li ◽  
Yan Wen
Keyword(s):  
Industrial Applications ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Red Phosphor ◽  
Light Emitting ◽  
X Ray ◽  
Red Phosphors ◽  
Fixed Condition

Micro-sized K2SiF6:Mn[Formula: see text] red phosphor was prepared by a simple method. Oleic acid (OA) was used as dispersant and reductant. In a fixed condition of the mole ratio of SiO2/KMnO4, the effects of the volume of OA on the morphology and luminescence properties were studied. X-ray diffraction (XRD) was used to characterize the phase. Scanning electron microscopy (SEM) and luminescence spectra were carried out to identify the morphology and the luminescence properties, respectively. The results show that the dispersive particles of K2SiF6:Mn[Formula: see text] red phosphor [Formula: see text] 3[Formula: see text][Formula: see text]m larger was obtained, which is suitable for industrial applications.

scholarly journals Lu3+ doping induced photoluminescence enhancement in novel high-efficiency Ba3Eu(BO3)3 red phosphors for near-UV-excited warm-white LEDs

RSC Advances ◽  
2018 ◽  
Vol 8 (59) ◽  
pp. 33710-33716 ◽  
Author(s):  
Bin Li ◽  
G. Annadurai ◽  
Jia Liang ◽  
Liangling Sun ◽  
Shaoying Wang ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
High Efficiency ◽  
Internal Quantum Efficiency ◽  
White Leds ◽  
Red Phosphors ◽  
Photoluminescence Enhancement

Novel high-efficiency Ba3Eu(BO3)3:Lu3+ red phosphors with internal quantum efficiency as great as 87% were developed for near-UV-excited warm-white LEDs.

K2Ln(PO4)(WO4):Tb3+,Eu3+ (Ln = Y, Gd and Lu) phosphors: highly efficient pure red and tuneable emission for white light-emitting diodes

2015 ◽  
Vol 3 (9) ◽  
pp. 2107-2114 ◽  
Author(s):  
Dawei Wen ◽  
Jiajun Feng ◽  
Junhao Li ◽  
Jianxin Shi ◽  
Mingmei Wu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
White Light ◽  
Light Emitting Diodes ◽  
Internal Quantum Efficiency ◽  
Red Phosphor ◽  
Light Emitting ◽  
Highly Efficient ◽  
White Light Emitting Diodes

K2Tb0.5Eu0.5(PO4)(WO4) red phosphor with an internal quantum efficiency of 76.45% is produced. Furthermore, the luminescence colour can be tuned from green to red by adjusting the ratio of Tb3+ and Eu3+.

A Promising Energy-Saving and Environmental-Friendly Lighting Device: High CRI White LED with Phosphor Materials

2016 ◽  
Vol 848 ◽  
pp. 446-453
Author(s):  
Sheng Liu ◽  
Bei Ying Zhou ◽  
Shi Jia Gu ◽  
Lian Jun Wang ◽  
Wan Jiang ◽  
...  
Keyword(s):  
Environmental Scanning Electron Microscopy ◽  
Luminescence Spectra ◽  
Environmental Scanning ◽  
X Ray Diffraction ◽  
Green Phosphor ◽  
Red Phosphor ◽  
White Leds ◽  
Phase Surface ◽  
Color Rendering ◽  
Fluorescence Spectrometer

Two kinds of commercial LED phosphors (green phosphor LuAG:Ce3+ and red phosphor CaAlSiN3:Eu2+) with polymethyl methacrylate (PMMA) powders were mixed to prepare film phosphors with tunable emission peak in photoluminescence spectrum by flat vulcanizing machine under the temperature of 170 oC and pressure of 2 MPa. The physical phase, surface morphology, transmittance, luminescence spectra of samples were characterized by means of X-ray diffraction (XRD), Environmental scanning electron microscopy (ESEM), Ultraviolet-Visible (UV-Vis) spectrophotometry and Fluorescence spectrometer. The results show that the film phosphors phase was consistent with raw phosphors, phosphor particles were uniformly distributed, and fluorescence spectra with different proportions of phosphors in different position can be adjusted. Tested by HSP 3000 spectrum analyzer, the white LEDs fabricated by blue chip and composite film phosphor containing 5 wt% green phosphor and 1.5 wt.% red phosphor, which refers to the remote excitation technique, possessed color coordinate of (0.3715, 0.3280) and color rendering index (CRI) of 87 when it was driven at power of 36 V/140 mA, reaching the international advanced level.

A New Method for Preparation and Luminescence of YBO3 :Eu3+ Phosphor

2011 ◽  
Vol 287-290 ◽  
pp. 1460-1463 ◽  
Author(s):  
Lin Yan Jia ◽  
Zhong Bao Shao ◽  
Yan Wen Tian
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Emission Spectra ◽  
Luminescent Properties ◽  
Solid State Reaction Method ◽  
Luminescence Spectra ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Red Phosphor ◽  
Milling Method

The pure phase red phosphor yttrium borate doped with Eu3+was prepared by a new solid state reaction named high temperature ball milling method. The phosphor was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and luminescence spectra. The results show that the single phase YBO3:Eu3+phosphor was obtained at 600°C, which is obviously decreased in contrast to conventional solid state reaction method. The particles are approximately nanometer size with narrow distribution range and spherical morphology. In emission spectra, the strongest peak at 597nm is due to the transition5D0→7F1 of Eu3+ions under 394nm monitoring wavelength. The luminescent properties of YBO3:Eu3+phosphor with 25 mol% doping concentration of Eu3+is optimal.

Development of New Red Phosphor Na3YSi2O7:Eu3+ for a White LED

2009 ◽  
Vol 421-422 ◽  
pp. 360-363 ◽  
Author(s):  
Shinichiro Kousaka ◽  
Kenji Toda ◽  
Tadashi Ishigaki ◽  
Kazuyoshi Uematsu ◽  
Mineo Sato
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Uv Light ◽  
White Led ◽  
Conventional Solid State Reaction ◽  
Red Phosphor ◽  
Red Emission ◽  
Red Phosphors ◽  
Silicate Phosphor

New red phosphors Na3YSi2O7:Eu3+ was prepared by a conventional solid-state reaction. This silicate phosphor can be efficiently excited by near UV light, yielding an intense red emission. Under the excitation of near UV light, the emission intensity is higher than that of a commercial red phosphor Y2O2S:Eu3+.

scholarly journals Effect of Eu3+ doping concentration on the structural and luminescence properties of NaYF4: Eu3+ nanoparticles

2020 ◽  
Vol 5 (1) ◽  
pp. first
Author(s):  
Cao Thi My Dung ◽  
Tran Thi Thanh Van ◽  
Lê Thuy Thanh Giang
Keyword(s):  
Emission Intensity ◽  
Doping Concentration ◽  
Solvothermal Method ◽  
Luminescent Properties ◽  
Hexagonal Structure ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Optimal Doping Concentration ◽  
Xrd Patterns

In our study, hexagonal-NaYF4: Eu3+ nanoparticles were synthesized by the solvothermal method at 180◦C for 24 hours. The typical vibrational spectrum showed the appearance of characteristic organic modes of oleic acid in the sample. The presence of elements such as Na, Y, F and Eu was indicated in the energy-dispersive X-ray spectroscopy (EDX). X-ray diffraction (XRD) patterns revealed that the NaYF4 host possessed the hexagonal structure when the doping contents below 5 mol%. At the Eu3+ amount of 10 mol%, the XRD appeared additional peaks of cubic phase of NaYF4 host. Both XRD and TEM data showed that the crystal sizes increase slightly as a function of Eu3+ doping concentration. Under an excitation at 395 nm, photoluminescence (PL) spectra revealed that the ratio of emission intensity between orange and red were controlled by changing the doping concentration. The optimal doping concentration was about 7 mol% for achieving the highest emission intensity. Moreover, PL data also demonstrated that a part of ions Eu3+ could occupy at Y3+ sites in the crystal structure of NaYF4. Because of their outstanding luminescent properties, NaYF4:Eu nanoparticles would the potential material for applications in biomedical medicine, optoelectronics.

Structural and Optical Properties of Al0.30Ga0.70N/AlN Multiple Quantum Wells Grown on Vicinal 4H p-SiC Substrates by Molecular Beam Epitaxy

MRS Advances ◽  
2016 ◽  
Vol 2 (5) ◽  
pp. 271-276
Author(s):  
Gordie Brummer ◽  
Denis Nothern ◽  
T.D. Moustakas
Keyword(s):  
Optical Properties ◽  
Molecular Beam Epitaxy ◽  
Quantum Wells ◽  
Quantum Efficiency ◽  
Molecular Beam ◽  
Internal Quantum Efficiency ◽  
Multiple Quantum Wells ◽  
Multiple Quantum ◽  
X Ray Diffraction ◽  
Light Emitting

ABSTRACTAlGaN based multiple quantum wells (MQWs) were grown on 8° vicinal 4H p-SiC substrates by plasma-assisted molecular beam epitaxy. The MQWs were designed to emit near 300 nm using the wurtzite k.p model. The MQW periodicity and strain state were measured with X-ray diffraction. The optical properties were characterized with temperature dependent photoluminescence (PL). The internal quantum efficiency was estimated from the ratio of room temperature to 18K integrated PL intensity. Internal quantum efficiency up to 48% was achieved. These data are encouraging for future vertical and inverted ultraviolet light emitting diodes grown on p-SiC substrates.

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