Luminescence properties of Ca2Si5N8:Eu2+ prepared by gas-pressed sintering using BaF2 as flux and cation substitution

RSC Advances ◽  
2014 ◽  
Vol 4 (98) ◽  
pp. 55388-55393 ◽  
Author(s):  
Chuang Wang ◽  
Zhengyan Zhao ◽  
Xicheng Wang ◽  
Yanyan Li ◽  
Quansheng Wu ◽  
...  
Keyword(s):  
Emission Intensity ◽  
Red Shift ◽  
Luminescence Properties ◽  
Cation Substitution ◽  
Large Enhancement

The red-shift of the Ca2Si5N8:Eu2+ phosphors and a large enhancement in the emission intensity have been obtained by incorporating BaF2.

Upconversion luminescence properties of Li+-doped ZnWO4:Yb,Er

2008 ◽  
Vol 23 (8) ◽  
pp. 2078-2083 ◽  
Author(s):  
Xi-xian Luo ◽  
Wang-he Cao
Keyword(s):  
Liquid Phase ◽  
Calcination Temperature ◽  
Crystal Field ◽  
Lower Energy ◽  
Upconversion Luminescence ◽  
Peak Position ◽  
Liquid Phase Sintering ◽  
Red Shift ◽  
Luminescence Properties ◽  
Sintering Process

Upconversion luminescence (UPL) characteristics and effects of Li+ ion on the UPL of ZnWO4:Yb,Er polycrystalline phosphors were investigated. It was shown that introduction of Li+ ions could reduce the calcination temperature by about 200 °C and increase the crystallinity of ZnWO4:Yb,Er by a liquid-phase sintering process via formation of Li2WO4 and other intermediates. UPL efficiency is remarkably promoted by Li+ ions. Moreover, the UPL spectrum of Li+-doped ZnWO4:Yb,Er presents a red shift, and the strongest peak position shifts from 553 to 559 nm. These can be attributed to a shift in the 4f level barycenter to lower energy, which results from lowering of the symmetry of the crystal field around Er3+.

Emission red shift and energy transfer behavior of color-tunable KMg4(PO4)3:Eu2+,Mn2+phosphors

2015 ◽  
Vol 3 (21) ◽  
pp. 5516-5523 ◽  
Author(s):  
Jian Chen ◽  
Yan-gai Liu ◽  
Lefu Mei ◽  
Ziyao Wang ◽  
Minghao Fang ◽  
...  
Keyword(s):  
Energy Transfer ◽  
High Temperature ◽  
Solid State ◽  
Red Shift ◽  
Solid State Reactions ◽  
Luminescence Properties ◽  
Color Tunable ◽  
Transfer Behavior

A series of Eu2+- and Mn2+-coactivated KMg4(PO4)3phosphors were prepared by conventional high temperature solid-state reactions. Their luminescence properties, emission red shifts and the energy transfer between Eu2+and Mn2+were investigated and the related mechanisms were discussed in detail.

PREPARATION AND LUMINESCENCE PROPERTIES OF Eu2+-ACTIVATED Ba-Six-O-N PHOSPHORS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3221-3225 ◽  
Author(s):  
RUILI ZHANG ◽  
MANAKA NUMATA ◽  
TOMONORI MAEDA ◽  
YUJI AKAZAWA ◽  
KEI-ICHIRO MURAI ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Visible Region ◽  
Wavelength Region ◽  
Green Emission ◽  
Main Phase ◽  
Luminescence Properties ◽  
White Led

A series of oxonitridosilicates phosphors Ba - Si x - O - N / Eu 2+ ( x = Si / Ba =1~8, 5atom% Eu 2+) were synthesized using traditional solid-state reaction. For x = 2~8, the main phase of the obtained samples was Ba 3 Si 6 O 12 N 2. All Ba - Si x - O - N / Eu 2+( x = 1~8) materials could be efficiently excited in the UV to visible region(310~450 nm ) and had a green emission at 508~522 nm , making them attractive as conversion phosphors for white LED applications. With increasing x values, the emission peaks shifted to the longer wavelength region, while the emission intensity had a maximum at x = 6. The influence of the firing times was also discussed, after twice fired, there was a tendency of single-phased formed of the obtained materials and the emission intensity was greatly improved.

Effect of Al/Si substitution on the structure and luminescence properties of CaSrSiO4:Ce3+ phosphors: analysis based on the polyhedra distortion

2015 ◽  
Vol 3 (18) ◽  
pp. 4616-4622 ◽  
Author(s):  
Shihai Miao ◽  
Zhiguo Xia ◽  
Maxim S. Molokeev ◽  
Mingyue Chen ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Red Shift ◽  
Luminescence Properties

The polyhedra distortion originating from the variation of [(Si,Al)O4] induced a red-shift of the Ce3+ emission in CaSrSi1−xAlxO4:Ce3+,Li+ phosphors.

Luminescence Properties of Er3+/Tm3+-Doped Ga2O3-Bi2O3-PbO-GeO2 System Glasses

2011 ◽  
Vol 399-401 ◽  
pp. 982-986
Author(s):  
Jin Liu ◽  
Dong Mei Shi ◽  
Ying Gang Zhao ◽  
Xiao Feng Wang
Keyword(s):  
Emission Intensity ◽  
Near Infrared ◽  
Emission Spectra ◽  
Upconversion Emission ◽  
Infrared Emission ◽  
Optical Devices ◽  
Luminescence Properties ◽  
Red Emission ◽  
Fiber Optical ◽  
Near Infrared Emission

The visible and near infrared emission spectra of Er3+/Tm3+-doped Ga2O3-Bi2O3-PbO-GeO2(GBPG) glasses excited at 808 nm are experimentally investigated. The results reveal that 1.53 µm emission were enhanced with an increase of Er3+concentration. Furthermore, the incorporation of Er3+into Tm3+-doped systems has also resulted in intense 522, 545 and 693nm upconversion emission intensity and an weak 660 nm red emission. The possible mechanism and related discussions on this phenomenon have been presented. The results show that Er3+/Tm3+-codoped GBPG glass may be a promising materials for developing laser and fiber optical devices.

Red-shift of vanadate band-gap by cation substitution for application in phosphor-converted white light-emitting diodes

2014 ◽  
Vol 104 (18) ◽  
pp. 181904 ◽  
Author(s):  
XianTao Wei ◽  
Jun Wen ◽  
Shuo Li ◽  
Shan Huang ◽  
Jun Cheng ◽  
...  
Keyword(s):  
Band Gap ◽  
White Light ◽  
Light Emitting Diodes ◽  
Red Shift ◽  
Cation Substitution ◽  
Light Emitting ◽  
White Light Emitting Diodes

Cation substitution and luminescence properties of Eu2+/Ga3+-codoped Na2ZrSi2O7

2020 ◽  
Vol 54 (2) ◽  
pp. 025103
Author(s):  
Huidong Tang ◽  
Longzhu Li ◽  
Rong Yang ◽  
Yuwei Chen ◽  
Hyo Jin Seo
Keyword(s):  
Luminescence Properties ◽  
Cation Substitution

Luminescence properties of La2W2−xMoxO9 (x = 0–2):Eu3+ materials and their Judd–Ofelt analysis: novel red line emitting phosphors for pcLEDs

2017 ◽  
Vol 1 (3) ◽  
pp. 550-561 ◽  
Author(s):  
Kasturi S. ◽  
Sivakumar V.
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Luminescence Properties ◽  
Precipitation Technique ◽  
Co Precipitation ◽  
Red Line

The emission intensity of a Eu1.6La0.4W1.6Mo0.4O9 phosphor, synthesized by a co-precipitation technique, was found to be ∼1.78 times higher than that of the phosphor synthesized by a solid state reaction.

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