Effects of synthesizing time and Eu2+ concentration on photoluminescence properties of Ca2−xEuxMgSi2O7 phosphors

Phosphors with the compositions of [Formula: see text] ([Formula: see text], 0.015, 0.025, 0.035, and 0.045) are synthesized in a reduction atmosphere (5% H2 + 95% N2) using a solid-state reaction method. At first, the [Formula: see text] powder is synthesized at 1350[Formula: see text]C with a duration of [Formula: see text] h to find the optimum synthesizing time. SEM images show that the particle sizes increase with synthesizing time and as the synthesizing time is more than 4 h, the abnormal particles appear and the intensities at the emission peaks of photoluminescence excitation (PLE) and photoluminescence emission (PL) spectra decrease. Next, 1350[Formula: see text]C and 4 h are used as synthesized parameters, which are used to find the concentration quench effect of [Formula: see text] phosphors. As the concentration of [Formula: see text] ions of [Formula: see text] phosphors increases, the intensities at the emission peaks of PLE and PL spectra first increase and reach the maximum values at [Formula: see text], and then they decrease as the concentration of [Formula: see text] ions further increases. These results prove that the synthesizing time and concentration of [Formula: see text] ions are two important factors to affect the photoluminescence properties of [Formula: see text] phosphors.

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Effect of B2O3 or SiO2 Fluxes on Morphology and Size of Pr-Doped CaTiO3 Phosphor Particles and on their Photoluminescence Properties

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.497.31 ◽

2011 ◽

Vol 497 ◽

pp. 31-37 ◽

Cited By ~ 1

Author(s):

Toru Kyomen ◽

Ryuta Motani ◽

Minoru Hanaya

Keyword(s):

Solid State ◽

Solid State Reaction ◽

Primary Particle ◽

Solid State Reaction Method ◽

Particle Sizes ◽

Photoluminescence Properties ◽

Conventional Solid State Reaction ◽

Red Phosphor ◽

Reaction Method ◽

Primary Particles

Powder of Pr-doped CaTiO3 red phosphor was prepared at 1473 K by a conventional solid-state reaction method with addition of B2O3 or SiO2 as a flux. Primary particle sizes of the prepared samples were increased by using B2O3 flux but decreased by using SiO2 flux. Clear planes, edges, or steps were observed on surfaces of the primary particles. The intensity of photoluminescence induced by irradiation of light with a wavelength longer than ∼350 nm was enhanced about three times by using B2O3 flux. The intensity of photoluminescence induced by irradiation of light with a wavelength shorter than ∼350 nm was enhanced about twice by using either B2O3 or SiO2 fluxes. The origin for the flux effects is discussed.

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Effects of Sm3+ Doping on the Photoluminescence Properties of Ca9Eu1-xSmx(VO4)7 Red-Emitting Phosphors

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.1488 ◽

2012 ◽

Vol 512-515 ◽

pp. 1488-1493 ◽

Cited By ~ 2

Author(s):

Li Hong Liu ◽

Rong Jun Xie ◽

Xu Dong Sun ◽

Qing Huang ◽

Naoto Hirosaki

Keyword(s):

Crystal Structure ◽

Solid State ◽

Excitation Energy ◽

Solid State Reaction ◽

Emission Intensity ◽

Solid State Reaction Method ◽

Photoluminescence Properties ◽

Reaction Method ◽

White Leds ◽

Uv Led

This paper reports the photoluminescence properties of Ca9Eu1-xSmx(VO4)7 (x=0.2-0.4) synthesized at 1250 oC in air for 12 h using traditional solid-state reaction method. With the increase of Sm3+ substitution amount, purity Ca9Eu1-xSmx(VO4)7 phase was obtained even when the Eu3+ ions were totally substituted by Sm3+. The experimental results showed that when Sm3+ was codoped with Eu3+ into Ca9Eu1-xSmx(VO4)7 crystal structure, Sm3+ would act as a sensitizer and transfer the excitation energy to Eu3+ ions and finally enhance the emission intensity of Ca9Eu1-xSmx(VO4)7 under 405 nm excitation, which leads to more favorite of this kind of phosphor used in UV LED based white LEDs.

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Size-dependent optical and thermochromic properties of Sm3Fe5O12

RSC Advances ◽

10.1039/c7ra05803a ◽

2017 ◽

Vol 7 (60) ◽

pp. 37765-37770 ◽

Cited By ~ 5

Author(s):

Huanhuan Liu ◽

Long Yuan ◽

Hui Qi ◽

Yanyan Du ◽

Shan Wang ◽

...

Keyword(s):

High Temperature ◽

Solid State ◽

Solid State Reaction ◽

Sol Gel ◽

Solid State Reaction Method ◽

Inorganic Materials ◽

Particle Sizes ◽

Reaction Method ◽

Size Dependent ◽

Thermochromic Properties

Reversible thermochromic inorganic materials of Sm3Fe5O12with different particle sizes have been synthesized by a conventional high temperature solid state reaction method (2.51 μm) and sol–gel method (0.16 μm).

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Photoluminescence properties of europium doped di-strontium magnesium di-silicate phosphor by solid state reaction method

Journal of Radiation Research and Applied Sciences ◽

10.1016/j.jrras.2014.12.006 ◽

2015 ◽

Vol 8 (1) ◽

pp. 104-109 ◽

Cited By ~ 34

Author(s):

Ishwar Prasad Sahu ◽

D.P. Bisen ◽

Nameeta Brahme ◽

Raunak Kumar Tamrakar

Keyword(s):

Solid State ◽

Solid State Reaction ◽

Solid State Reaction Method ◽

Photoluminescence Properties ◽

Reaction Method ◽

Silicate Phosphor

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Photoluminescence properties of Pr3+, Sm3+ and Tb3+ doped SrAlSi4N7 and energy level locations of rare-earth ions in SrAlSi4N7

Journal of Materials Chemistry C ◽

10.1039/c4tc00538d ◽

2014 ◽

Vol 2 (37) ◽

pp. 7952-7959 ◽

Cited By ~ 22

Author(s):

Zhi-Jun Zhang ◽

Otmar M. ten Kate ◽

Anneke Delsing ◽

Pieter Dorenbos ◽

Jing-Tai Zhao ◽

...

Keyword(s):

Rare Earth ◽

High Temperature ◽

Solid State ◽

Energy Level ◽

Solid State Reaction ◽

Solid State Reaction Method ◽

Rare Earth Ions ◽

Photoluminescence Properties ◽

Reaction Method

RE3+ (RE = Pr, Sm, and Tb)-doped SrAlSi4N7 samples were synthesized by a solid-state reaction method at high temperature, and their photoluminescence properties were investigated.

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Developments of crystal structures and photoluminescence properties of Sr0.85Eu0.15Al12O19 green phosphors using different synthesis parameters

Modern Physics Letters B ◽

10.1142/s0217984921410190 ◽

2021 ◽

Author(s):

Jie Li ◽

Qing-Hao Yang ◽

Hsin-Hua Li ◽

Cheng-Fu Yang ◽

David Jui-Yang Feng

Keyword(s):

Crystal Structures ◽

Solid State Reaction Method ◽

Synthesis Temperature ◽

Emission Peak ◽

Photoluminescence Excitation ◽

Photoluminescence Properties ◽

Apparent Effect ◽

Reaction Method ◽

Pl Spectra ◽

Synthesis Parameters

First, a solid-state reaction method was used to synthesize a [Formula: see text] phosphor at 1250[Formula: see text]C–1400[Formula: see text]C for 1 h, and its crystal structures and photoluminescence properties were investigated as a function of synthesis temperature. When the furnace reached the synthesis temperature, the 5% [Formula: see text] reduction atmosphere was infused and the reduction atmosphere was removed as the temperature was dropped to 800[Formula: see text]C. When 1200[Formula: see text]C was used as the synthesis temperature, the [Formula: see text], [Formula: see text], and [Formula: see text] phases co-existed; only one weak emission peak was observed in the photoluminescence excitation (PLE) spectra, and two weak emission peaks were observed in the photoluminescence emission (PL) spectra. When the [Formula: see text] phosphors were synthesized at a temperature higher than 1200[Formula: see text]C, the diffraction intensities of [Formula: see text], [Formula: see text], and [Formula: see text] phases were almost unchanged, but the crystal sizes of [Formula: see text] powders increased. For [Formula: see text] phosphors, PLE spectra had one broad exciting band with two centered wavelengths of 317 and 365 nm, and PL spectra had one emission band with one centered wavelength of 513 nm. As the synthesis temperature rose, the emission intensities of PLE and PL spectra increased. Second, we show that the removed temperature of reduction atmosphere of [Formula: see text] phosphors had an apparent effect on their emission properties of PLE and PL spectra.

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Photoluminescence properties of europium and titanium co-doped BaZrO3 phosphors powders synthesized by the solid-state reaction method

Optical Materials ◽

10.1016/j.optmat.2012.05.024 ◽

2012 ◽

Vol 34 (11) ◽

pp. 1890-1896 ◽

Cited By ~ 22

Author(s):

Dongling Sun ◽

Dongcai Li ◽

Zhiwen Zhu ◽

Jin Xiao ◽

Zetian Tao ◽

...

Keyword(s):

Solid State ◽

Solid State Reaction ◽

Solid State Reaction Method ◽

Photoluminescence Properties ◽

Reaction Method ◽

Co Doped

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

Functional Materials Letters ◽

10.1142/s1793604720510303 ◽

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.

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