An Investigation of the Chromaticity of Blue Emitting Yttrium Silicate

1999 ◽  
Vol 560 ◽  
Author(s):  
E. J. Bosze ◽  
G. A. Hirata ◽  
J. Mckittrick
Keyword(s):  
Relative Intensity ◽  
Luminescence Intensity ◽  
Emission Intensity ◽  
Low Voltage ◽  
Blue Color ◽  
Co Doping ◽  
Yttrium Silicate ◽  
Silicate Phosphors

ABSTRACTThis investigation studied the effects of Ho3+ and Er3+ on the luminescence of the blue emitting phosphor yttrium silicate, (Y1-mCem)2SiO5. Yttrium silicate has a large emission tail that extends into the red portion of the visual spectrum. To improve the chromaticity of this phosphor to give it a more saturated blue color, the emission intensity of the tail needs to be decreased. Photoluminscence and low-voltage cathodoluminescence measurements were performed on yttrium silicate phosphors with varying concentrations of Gd3+, Ho3+ and Er3+. It was found that when co-doping with Ho3+ and Er3+, the relative intensity of the emission tail was decreased, but so to was the overall luminescence intensity of this phosphor.

An Investigation of the Chromaticity of Blue Emitting Yttrium Silicate

1999 ◽  
Vol 558 ◽  
Author(s):  
E. J. Bosze ◽  
G. A. Hirata ◽  
J. Mckittrick
Keyword(s):  
Relative Intensity ◽  
Luminescence Intensity ◽  
Emission Intensity ◽  
Low Voltage ◽  
Blue Color ◽  
Co Doping ◽  
Yttrium Silicate ◽  
Silicate Phosphors

ABSTRACTThis investigation studied the effects of Ho3+ and Er3+ on the luminescence of the blue emitting phosphor yttrium silicate, (Y1−mCem)2SiO5. Yttrium silicate has a large emission tail that extends into the red portion of the visual spectrum. To improve the chromaticity of this phosphor to give it a more saturated blue color, the emission intensity of the tail needs to be decreased. Photoluminscence and low-voltage cathodoluminescence measurements were performed on yttrium silicate phosphors with varying concentrations of Gd3+, Ho3+ and Er3+. It was found that when co-doping with Ho3+ and Er3+, the relative intensity of the emission tail was decreased, but so to was the overall luminescence intensity of this phosphor.

Low-Voltage Cathodoluminescent Properties of Blue-Emitting Yttrium Silicates Doped With Cerium

1998 ◽  
Vol 508 ◽  
Author(s):  
E. J. Bosze ◽  
G. A. Hirata ◽  
J. Mckittrick ◽  
L. E. Shea
Keyword(s):  
Emission Intensity ◽  
Low Voltage ◽  
Low Cost ◽  
Single Step ◽  
Monoclinic Space Group ◽  
Fluorescent Properties ◽  
Refractory Powder ◽  
Space Group ◽  
Yttrium Silicate ◽  
Oxide Powders

AbstractYttrium silicate activated with Ce3+, (Y1−xCex)2SiO5, has been found to be an efficient phosphor that can potentially be used as the blue-emitting component in field emission flat panel displays. This highly refractory powder can be synthesized by combustion synthesis, a low cost technique used to fabricate multicomponent oxide powders in a single step process. The effect of activator concentration and post-synthesis annealing was examined on the fluorescent properties. The powders were found to be monoclinic space group P21/c in the as-synthesized state, and transformed to monoclinic space group C2/c after annealing. The maximum luminous emission intensity was reached after a one hour anneal at 1350°C for x=0.0075, with the peak Ce3+ emission wavelength between 420 and 450 nm. When co-doped with Gd3+, no increase in the emission intensity was observed.

scholarly journals Semi-synthetic aequorins with improved sensitivity to Ca2+ ions

1989 ◽  
Vol 261 (3) ◽  
pp. 913-920 ◽  
Author(s):  
O Shimomura ◽  
B Musicki ◽  
Y Kishi
Keyword(s):  
Relative Intensity ◽  
Luminescence Intensity ◽  
Intensity Ratio ◽  
Ratio Method ◽  
Prominent Feature ◽  
Wide Range

Thirty-seven coelenterazine analogues were synthesized and incorporated into apo-aequorin, yielding 30 semi-synthetic aequorins that have the capacity to emit a significant amount of light in the presence of Ca2+. The properties of resultant photoproteins were investigated. The most prominent feature of those photoproteins was the wide range in their sensitivities to Ca2+ concentration. The relative intensity of Ca2+-triggered luminescence of the photoproteins ranged from 0.01 to 190 when compared with natural aequorin (relative intensity 1.0) at pCa 6 for the cases where the relative intensity is less than 1 and at pCa 7 for the cases where the relative intensity is higher than 1. Eight of the semi-synthetic aequorins belonged to the class of e-aequorin. With two of those photoproteins, the degree of dependence of the luminescence intensity ratio I400/I465 on pCa was greater than that with e-aequorin, suggesting that these two photoproteins are possibly superior to e-aequorin in measuring Ca2+ concentration by the ratio method.

Enhancement emission intensity of CaMoO4 : Eu3+, Na+phosphor via Bi co-doping and Si substitution for application to white LEDs

2009 ◽  
Vol 42 (10) ◽  
pp. 105107 ◽  
Author(s):  
An Xie ◽  
Ximing Yuan ◽  
Shujie Hai ◽  
Juanjuan Wang ◽  
Fengxiang Wang ◽  
...  
Keyword(s):  
Emission Intensity ◽  
White Leds ◽  
Co Doping

Preparation and Up-Conversion Luminescence of Yb3+ and Er3+ Co-Doped BaF2 Phosphor

2011 ◽  
Vol 287-290 ◽  
pp. 490-493
Author(s):  
Li Qun Cheng ◽  
Guang Cheng ◽  
Rui Dong ◽  
Xi Yan Zhang
Keyword(s):  
High Temperature ◽  
Luminescence Intensity ◽  
Emission Intensity ◽  
Charge Compensation ◽  
Solid Reaction ◽  
Reaction Method ◽  
Optimal Ratio ◽  
Method Effects ◽  
Co Doped

Yb3+and Er3+co-doped BaF2phosphors were prepared by high temperature solid reaction method. Effects of mol content ratios of Yb3+ion to Er3+ion (CYb3+∶CEr3+) and charge compensation agent Na2SiF6 contents on the up-conversion luminescence of the samples were studied. The XRD and PL were carried out to investigate the phases and the up-conversion luminescence. Three up-conversion emissions were observed with peaks at 460nm, 548nm and 660nm respectively. The up-conversion luminescence intensity increases firstly, and then decreases with increasing CYb3+∶CEr3+ and the optimal ratio was found to be at 12:2 with fixed Er3+contents 2mol%. The up-conversion emission intensity was enhanced by introducing Na2SiF6 as the charge compensation agents and its optimal content was found to be 2mol%.

Influence of Dy3+ co-doping on the luminescence properties of bluish-green Ba1−0.5ySr1−0.5yAl2SiO7:yEu2+ phosphors

2020 ◽  
Vol 44 (37) ◽  
pp. 15821-15827
Author(s):  
Abdul Hakeem Deshmukh ◽  
Amir Muhammad Afzal ◽  
Asad Syed ◽  
Hongli Wen ◽  
Andrzej Suchocki
Keyword(s):  
Emission Intensity ◽  
Luminescence Properties ◽  
Co Doping ◽  
Bluish Green

The emission intensity of Ba0.985Sr0.985Al2SiO7:0.03Eu2+ is enhanced due to the incorporation of Dy3+. The emission intensity of Ba0.975Sr0.975Al2SiO7:0.03Eu2+, 0.02Dy3+ was about 350% that of the Ba0.985Sr0.985Al2SiO7:0.03Eu2+ phosphor.

scholarly journals Near-infrared excited luminescence and in vitro imaging of HeLa cells by using Mn2+ enhanced Tb3+ and Yb3+ cooperative upconversion in NaYF4 nanocrystals

2019 ◽  
Vol 1 (9) ◽  
pp. 3463-3473 ◽  
Author(s):  
Katarzyna Prorok ◽  
Michał Olk ◽  
Michał Skowicki ◽  
Agnieszka Kowalczyk ◽  
Agata Kotulska ◽  
...  
Keyword(s):  
Hela Cells ◽  
Emission Intensity ◽  
Near Infrared ◽  
Upconversion Emission ◽  
Significant Enhancement ◽  
New Approach ◽  
Co Doping ◽  
Cooperative Upconversion ◽  
Excited Luminescence

To improve the Tb3+ upconversion emission intensity, a new approach, i.e. Mn2+ co-doping, has been proposed and verified in this work. The significant enhancement of the emission intensity as a result of the introduction of Mn2+ ions was observed.

Strong Activator-Host Interaction in Rare Earth Borate Phosphors

1999 ◽  
Vol 560 ◽  
Author(s):  
V.Z. Mordkovich ◽  
A.G. Umnov ◽  
T. Inoshita
Keyword(s):  
Rare Earth ◽  
Concentration Dependence ◽  
Emission Intensity ◽  
Strong Influence ◽  
Low Voltage ◽  
Concentration Increase ◽  
Cerium Content ◽  
Host Interaction ◽  
Rare Earth Borate ◽  
Strong Activator

ABSTRACTCe3+ luminescence in yttrium cerium aluminium borates was studied. A substantial red shift in photoluminescence and low-voltage cathodoluminescence spectra was found to be induced by Ce concentration increase. Complicated concentration dependence of emission intensity and strong influence of cerium content on emission wavelength suggest strong activator-host interaction in rare earth borates.

Effect of Co-Doping on the Photoluminescent Behavior and Electronic Structure of Zinc Silicate Phosphors

1999 ◽  
Vol 560 ◽  
Author(s):  
H.D. Park ◽  
K.-S. Sohn ◽  
B. Cho ◽  
H. Chang
Keyword(s):  
Experimental Data ◽  
Electronic Structure ◽  
First Principles ◽  
Zinc Silicate ◽  
Co Doping ◽  
Silicate Phosphors

ABSTRACTThe present study aims at investigating the effect of co-doping on the photoluminescence(PL) property of Zn2SiO4:Mn phosphor. Experimental data were interpreted by the first principles embedded-cluster discrete variational (DV)-Xα method.

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