Effects of local symmetry on upconversion emission mechanisms under pulsed excitation

2019 ◽  
Vol 7 (44) ◽  
pp. 13770-13777 ◽  
Author(s):  
Daniel Avram ◽  
Claudiu Colbea ◽  
Carmen Tiseanu
Keyword(s):  
Emission Intensity ◽  
Local Symmetry ◽  
Upconversion Emission ◽  
Pulsed Excitation

Under pulsed excitation, the upconversion emission intensity is comparable/110 times greater in higher compared to in lower local symmetry, in contrast to cw excited upconversion.

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.

Significant enhancement of visible up-conversion emissions of Y2O2S:Er3+ phosphors by Mn2+ sensitizing under 1550 nm excitation

RSC Advances ◽  
2014 ◽  
Vol 4 (32) ◽  
pp. 16710-16715 ◽  
Author(s):  
Shuanglong Yuan ◽  
Huidan Zeng ◽  
Xuanshun Wu ◽  
Zhao Liu ◽  
Jing Ren ◽  
...  
Keyword(s):  
Emission Intensity ◽  
Upconversion Emission ◽  
Significant Enhancement

Significant enhancement of the upconversion emission intensity of Y2O2S:Er3+ was achieved by Mn2+ sensitizing under 1550 nm excitation.

Photoluminescence of GdVO4:Eu3+, Al 3+ Phosphors under VUV Excitation

2012 ◽  
Vol 18-19 ◽  
pp. 257-263 ◽  
Author(s):  
K. Park ◽  
M.H. Heo ◽  
Y. Kim ◽  
J.Y. Kim
Keyword(s):  
High Purity ◽  
Emission Intensity ◽  
Emission Spectra ◽  
Local Symmetry ◽  
Emission Peak ◽  
Photoluminescence Properties ◽  
High Quality ◽  
Red Emission ◽  
Crystallite Sizes ◽  
The Difference

The microstructure and photoluminescence properties of Gd0.94-xAlxEu0.06VO4 (0≤x≤0.04) phosphors with various Al3+ contents were investigated. The phosphors showed a nanocrystalline nature and a high-quality powder characteristic. The crystallite sizes of the phosphors were calculated to be 46-48 nm. The annealed Gd0.94-xAlxEu0.06VO4 phosphors crystallized in the tetragonal structure. In the emission spectra, several emission peaks were observed over the measured wavelength range (500-750 nm), which were caused by the difference in the transitions of Eu3+ ions, depending on the local symmetry (5D0 → 7Fj, j = 1, 2, 3, and 4). The strongest emission peak was located at 619 nm, providing a high-purity red emission. The doped Al3+ yielded significantly enhanced the emission intensity. The most intense high-purity red emission was obtained for Gd0.93Al0.01Eu0.06VO4.

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.

The reported anomalous emission intensity of the 5D0 → 7F4 transition of Eu3+ in a molybdate double perovskite

2015 ◽  
Vol 3 (5) ◽  
pp. 960-963 ◽  
Author(s):  
Wai-Lun Chan ◽  
Zhenyu Liu ◽  
Shengbo Lu ◽  
Peter A. Tanner ◽  
Ka-Leung Wong
Keyword(s):  
Transition Metal ◽  
Emission Intensity ◽  
Double Perovskite ◽  
Upconversion Emission ◽  
Starting Material ◽  
Metal Impurity ◽  
Transition Metal Impurity ◽  
Co Doped

The assigned anomalous upconversion emission intensity of the 5D0 → 7F4 transition of Eu3+ in the double perovskite Sr2Ca(W1−xMox)O6 co-doped with Yb3+ is shown to be due to a transition metal impurity present in the MoO3 starting material.

Dependence of upconversion emission intensity on Yb3+concentration in Er3+/Yb3+co-doped flake shaped Y2(MoO4)3phosphors

2010 ◽  
Vol 43 (8) ◽  
pp. 085404 ◽  
Author(s):  
Weili Lu ◽  
Lihong Cheng ◽  
Haiyang Zhong ◽  
Jiashi Sun ◽  
Jing Wan ◽  
...  
Keyword(s):  
Emission Intensity ◽  
Upconversion Emission ◽  
Co Doped

PHOTON AVALANCHE UPCONVERSION EMISSION IN Ho:Gd2O3 NANOPHOSPHOR

2011 ◽  
Vol 10 (04n05) ◽  
pp. 925-928 ◽  
Author(s):  
Y. DWIVEDI ◽  
S. B. RAI
Keyword(s):  
Structural Properties ◽  
Emission Intensity ◽  
Temporal Evolution ◽  
Spectroscopic Properties ◽  
Upconversion Emission ◽  
Paper Report ◽  
Uniform Size ◽  
Nano Phosphor ◽  
Structural Characterizations ◽  
Upconversion Process

This paper report, the structural and spectroscopic properties of Gd2O3 nano-phosphor activated with Ho3+ ions. XRD, SEM and TEM techniques have been used for the structural characterizations. The phosphor contains spherical nanocrystallites with uniform size of ~40 nm. Enhanced IR to green and red photon avalanche upconversion is reported under 976 nm laser excitations. Further, annealing shows a significant improvement in emission intensity. Temporal evolution of upconversion emission intensity were measured which suggests the photon-avalanche mechanism is responsible for the upconversion process. The enhancement of emission was explained and the photo-physics involved is correlated with the unique structural properties of the crystallites formed.

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