Structural investigation and improvement of photoluminescence properties in Ba(ZrxTi1−x)O3 powders synthesized by the solid state reaction method

2013 ◽  
Vol 142 (1) ◽  
pp. 70-76 ◽  
Author(s):  
S. Parida ◽  
S.K. Rout ◽  
L.S. Cavalcante ◽  
A.Z. Simões ◽  
P.K. Barhai ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Structural Investigation ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
Reaction Method

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

2012 ◽  
Vol 512-515 ◽  
pp. 1488-1493 ◽  
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.

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

2011 ◽  
Vol 497 ◽  
pp. 31-37 ◽  
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.

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

2014 ◽  
Vol 2 (37) ◽  
pp. 7952-7959 ◽  
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.

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

2021 ◽  
pp. 21410001
Author(s):  
Yu Fan ◽  
Chin-Ta Chen ◽  
Yen-Tsu Wang ◽  
Cheng-Fu Yang
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Particle Sizes ◽  
Photoluminescence Excitation ◽  
Photoluminescence Properties ◽  
Sem Images ◽  
Photoluminescence Emission ◽  
Reaction Method ◽  
Pl Spectra

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.

Ce3+ and Tb3+-doped lutetium-containing silicate phosphors: synthesis, structure refinement and photoluminescence properties

2016 ◽  
Vol 4 (16) ◽  
pp. 3443-3453 ◽  
Author(s):  
Kai Li ◽  
Sisi Liang ◽  
Hongzhou Lian ◽  
Mengmeng Shang ◽  
Bengang Xing ◽  
...  
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Solid State Reaction ◽  
Structure Refinement ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
Reaction Method ◽  
Silicate Phosphors

A series of Ce3+ and Tb3+-doped BaLu2Si3O10 (BLSO) phosphors synthesized via the high-temperature solid-state reaction method were investigated.

Photon Cascade Emission of Pr3+-Doped K2YZr(PO4)3 Phosphor

2013 ◽  
Vol 815 ◽  
pp. 677-681 ◽  
Author(s):  
Wei Liang ◽  
Liang Feng Niu ◽  
Yuan Hao Gao ◽  
Yu Hua Wang
Keyword(s):  
Solid State ◽  
Energy Level ◽  
Solid State Reaction ◽  
Ultra Violet ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
Reaction Method ◽  
Cascade Emission ◽  
Vacuum Ultra Violet ◽  
Photon Cascade Emission

In present work, K2Y1-xZr (PO4)3:Prx3+(0.01x0.05) samples were prepared by solid-state reaction method and their photoluminescence properties were investigated in ultra-violet (UV) and vacuum ultra-violet (VUV) region. The photon cascade luminescence (PCL) of Pr3+had been observed. All the results indicate that, in this Pr3+-doped K2YZr (PO4)3phosphor, even if the1S0state is higher than the lowest 4f5d energy level, the photon cascade emission (PCE) process for Pr3+still could occur under 147 nm and 234 nm (4f15d1state) excitation. Therefore, K2YZr (PO4)3was an ideal host for Pr3+to implement the PCE process successfully.

scholarly journals SYNTHESIS, CHARACTERIZATION AND PHOTOLUMINESCENCE PROPERTIES OF EU3+DOPED CALCIUM SILICATE PHOSPHOR BY CONVENTIONAL SOLID STATE REACTION METHOD

2020 ◽  
Vol 8 (12) ◽  
pp. 762-769
Author(s):  
Ch. Atchyutha Rao ◽  
◽  
K.V.R. Murthy ◽  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Calcium Silicate ◽  
Solid State Reaction Method ◽  
High Temperature Strength ◽  
Photoluminescence Properties ◽  
Conventional Solid State Reaction ◽  
Excitation Light ◽  
Reaction Method ◽  
Silicate Phosphor

Calcium Silicate phosphor acquires a higher luminous efficiency when it is doped with rare earth activated ions. Silicate phosphors are used for a fluorescent, a cathode-ray tube, a luminous body, a vacuum ultraviolet excitation light emitting element etc. The silicates of calcium are known for their thermal stability, high temperature strength, low thermal expansion, cheep residence and chemical inertness. The present paper reports on the synthesis, characterization and photoluminescence properties of Eu3+ doped calcium silicate phosphor prepared by conventional solid state reaction method heating at 12000C for 3 hrs. The received cakes are grounded for 30 minutes each. The phosphors are prepared and the received powder is subjected to PL, XRD, SEM, EDAX and CIE analysis. The following section discusses and the experimental results are mentioned in these phosphors. The present Phosphor can act as a host for red light emission in many display devices and technological applications.

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