Enhancement of red spectral emission intensity of Y3Al5O12:Ce3+ phosphor via Pr co-doping and Tb substitution for the application to white LEDs

2007 ◽  
Vol 126 (2) ◽  
pp. 371-377 ◽  
Author(s):  
Ho Seong Jang ◽  
Won Bin Im ◽  
Dong Chin Lee ◽  
Duk Young Jeon ◽  
Shi Surk Kim
Keyword(s):  
Emission Intensity ◽  
Spectral Emission ◽  
White Leds ◽  
Co Doping

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

Influence of sample temperature on the laser-induced breakdown spectroscopy of a molybdenum–tungsten alloy

2019 ◽  
Vol 34 (12) ◽  
pp. 2378-2384 ◽  
Author(s):  
Ran Hai ◽  
Zhonglin He ◽  
Ding Wu ◽  
Weina Tong ◽  
Harse Sattar ◽  
...  
Keyword(s):  
Laser Ablation ◽  
Electron Density ◽  
Emission Intensity ◽  
Plasma Temperature ◽  
Sample Temperature ◽  
Tungsten Alloy ◽  
Laser Induced Breakdown Spectroscopy ◽  
Spectral Emission ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown

During laser ablation, the spectral emission intensity, plasma temperature and electron density increased significantly with increasing sample temperature.

Synthesis and characterization of YAG:Ce phosphors for white LEDs

2015 ◽  
Vol 23 (4) ◽  
Author(s):  
V. Tucureanu ◽  
A. Matei ◽  
A.M. Avram
Keyword(s):  
Sol Gel ◽  
Luminescent Properties ◽  
Blue Shift ◽  
Temperature Treatment ◽  
Yttrium Aluminium Garnet ◽  
White Leds ◽  
Light Emitting Devices ◽  
Co Doping ◽  
Co Precipitation ◽  
Average Size

AbstractWorldwide commercial interest in the production of cerium doped yttrium aluminium garnet (YAG:Ce) phosphors is reflected in the widespread use of white light emitting devices. Despite of the fact that YAG:Ce is considered a “cool phosphor” it is the most important in white LED technology. This article reviews the developed techniques for producing phosphors with superior photoluminescence efficiency, including solid-state reaction, sol-gel and (co)precipitation methods. Also, by co-doping with rare earth elements, a red/blue shift is reached in the spectrum. The characteristics of YAG:Ce phosphors are investigated because the properties of the phosphors are strongly influenced by the synthesis routes and the sintering temperature treatment. After the phase analysis, morphology and emission studies of the phosphors there may be seen the conditions when the transition from the amorphous phase to the crystalline phase appears, when luminescent properties are influenced by the crystalline form, purity, average size of the particles, co-doping and so on.

Enhanced red emission of NaSrVO4:Eu3+ phosphor via Bi3+co-doping for the application to white LEDs

2017 ◽  
Vol 43 (1) ◽  
pp. 830-834 ◽  
Author(s):  
Yu Zeng ◽  
Kehui Qiu ◽  
Ziqi Yang ◽  
Yunlei Bu ◽  
Wentao Zhang ◽  
...  
Keyword(s):  
Red Emission ◽  
White Leds ◽  
Co Doping

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.

scholarly journals Photoluminescence and energy transfer of YAG: Ce3+, Gd3+, Bi3+

2016 ◽  
Vol 06 (04) ◽  
pp. 1650029 ◽  
Author(s):  
Meidan Que ◽  
Wenxiu Que ◽  
Ting Zhou ◽  
Jinyou Shao ◽  
Lingbing Kong
Keyword(s):  
Crystal Structure ◽  
Energy Transfer ◽  
Emission Intensity ◽  
Emission Band ◽  
Emission Spectra ◽  
Excitation Band ◽  
Size Mismatch ◽  
White Leds ◽  
Orange Region ◽  
Potential Applications

In this study, Gd[Formula: see text] and Bi[Formula: see text] ions act to redshift the emission band to orange region, and to enhance significantly the maximum emission of YAG: Ce[Formula: see text]. On account that size mismatch between the host and the doped Gd[Formula: see text] ion, the crystal structure turns soft, and the emission spectra are not tuned from 540 to 570[Formula: see text]nm but decreased the emission intensity. Accordingly, an effective way to increase emission intensity is to introduce Bi[Formula: see text] ion into the YAG: Ce[Formula: see text], Gd[Formula: see text] phosphors. Experimental results show partial overlapping between the emission band of Bi[Formula: see text] ion and the excitation band of Ce[Formula: see text] ion, indicating that the energy transfer from Bi[Formula: see text] to Ce[Formula: see text] ions exists in the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor. Bi[Formula: see text] ion can serve as the activator to provide energy for Ce[Formula: see text] ion via cross relaxation phenomenon. Therefore, the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor could have potential applications in warm white LEDs.

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.

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