Significant blue-shift in photoluminescence excitation spectra of Nd3+:LaF3 potential laser medium at low-temperature

2015 ◽  
Vol 47 ◽  
pp. 462-464 ◽  
Author(s):  
Ren Arita ◽  
Yuki Minami ◽  
Marilou Cadatal-Raduban ◽  
Minh Hong Pham ◽  
Melvin John Fernandez Empizo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Blue Shift ◽  
Laser Medium ◽  
Photoluminescence Excitation ◽  
Excitation Spectra ◽  
Significant Blue Shift

scholarly journals PHOTOLUMINESCENCE EMISSION OF Cu DOPED ZnS MICROSTRUCTURES SYNTHESIZED BY THERMAL EVAPORATION

2018 ◽  
Vol 34 (2) ◽  
Author(s):  
Nghia Nguyen Van
Keyword(s):  
Thermal Evaporation ◽  
Hexagonal Phase ◽  
Green Emission ◽  
Blue Shift ◽  
Xrd Analysis ◽  
Photoluminescence Excitation ◽  
Excitation Spectra ◽  
Thermal Evaporation Method ◽  
Photoluminescence Emission ◽  
Green Emission Band

Cu doped ZnS microstructures were prepared by the thermal evaporation method using ZnS powder and CuCl2.2H2O powder as precusor materials. The microstructures was characterized by using X-ray diffraction (XRD) analysis. The XRD studies indicated that there are two phases (ZnS and ZnO) at the undoped sample, but  most of the samples are only having wurtzite (hexagonal) phase of ZnS after doping. The photoluminescence emission and photoluminescence excitation of ZnS and Cu2+ doped ZnS microstructures have been studied. The photoluminescence excitation spectra of  ZnS microstructures is present around 374 nm. After doping of Cu2+ ion the absorption wavelength shifted towards the lower wavelength, this blue shift in the absorption edge is a measure of increased band gap. The emission spectrum of pure ZnS has a green emission band centred at around 520 nm. After doping with Cu2+ ion the luminescence centers were transferred to 516 nm and a strong blue peak at 440 nm appears. The reasons of these will be discussed in this paper.

scholarly journals Low-temperature technology and physical processes in green thin-film phosphor Zn2GeO4-Mn

2001 ◽  
Vol 667 ◽  
Author(s):  
V. Bondar ◽  
S. Popovich ◽  
T. Felter ◽  
J. Wager
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Low Temperature ◽  
Esr Spectra ◽  
Photoluminescence Excitation ◽  
Manganese Ions ◽  
Physical Processes ◽  
Excitation Spectra ◽  
Lower Temperature ◽  
Electro Luminescence

ABSTRACTThin-film Zn2GeO4:Mn phosphors with lower temperature of crystallization and potentially compatible with industrial technologies were investigated. The technology of thin films synthesis has been developed and their structure and crystal parameters have been investigated. Photoluminescence excitation spectra, photoconductivity, temperature dependencies and ESR-spectra of manganese ions were studied. A mechanism for luminescence in this phosphor has been proposed. Results are presented of cathodo- and electro-luminescence of thin film structures of Zn2GeO4:Mn.

scholarly journals Effects of selenisation temperature on photoluminescence and photoluminescence excitation spectra of ZnO/CdS/Cu2ZnSnSe4/Mo/glass

2019 ◽  
Vol 672 ◽  
pp. 146-151 ◽  
Author(s):  
M.A. Sulimov ◽  
M.V. Yakushev ◽  
J. Márquez-Prieto ◽  
I. Forbes ◽  
P.R. Edwards ◽  
...  
Keyword(s):  
Photoluminescence Excitation ◽  
Excitation Spectra

scholarly journals Properties and Analysis of Transparency Conducting AZO Films by Using DC Power and RF Power Simultaneous Magnetron Sputtering

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Neng-Fu Shih ◽  
Jin-Zhou Chen ◽  
Yeu-Long Jiang
Keyword(s):  
Incident Light ◽  
Blue Shift ◽  
Light Wavelength ◽  
Rf Power ◽  
X Ray Diffraction ◽  
X Ray ◽  
Dc Power ◽  
Incident Light Wavelength ◽  
Significant Blue Shift ◽  
Sputtering System

DC power and RF power were introduced into the magnetic controlled sputtering system simultaneously to deposit AZO films in order to get an acceptable deposition rate with high quality transparency conducting thin film. The resistivity decreases with the RF power for the as-deposited samples. The resistivity of 6 × 10−4 Ω-cm and 3.5–4.5 × 10−4 Ω-cm is obtained for the as-deposited sample, and for all annealed samples, respectively. The transmittance of the AZO films with higher substrate temperature is generally above 80% for the incident light wavelength within 400–800 nm. The transmittance of the as-deposited samples reveals a clear blue shift phenomenon. The AZO films present (002) oriented preference as can be seen from the X-ray diffraction curves. All AZO films reveal compressive stress. The annealing process improves the electrical property of AZO films. A significant blue shift phenomenon has been found, which may have a great application for electrode in solar cell.

Low Temperature Combustion Synthesis and Characterization of Pr-CeO2 Doped with Zr Red Ceramic Pigments

2011 ◽  
Vol 399-401 ◽  
pp. 514-518
Author(s):  
Li Dan Yang ◽  
Ming Quan Ye ◽  
Ai Jun Han
Keyword(s):  
Low Temperature ◽  
Combustion Synthesis ◽  
Solid Solutions ◽  
Charge Transfer Band ◽  
Blue Shift ◽  
Fluorite Structure ◽  
Electronic Energy ◽  
Low Temperature Combustion ◽  
Visible Absorption ◽  
Temperature Combustion

New inorganic pigments Ce0.95ZrxPr0.05-xO2(x = 0, 0.01, 0.02, 0.03, 0.04, 0.05) based on CeO2-ZrO2-Pr6O11solid solutions were synthesized by low-temperature combustion synthesis (LCS) method using citric acid as a reductant and metal nitrate as an oxidant. The pigments are CeO2solid solutions doped with praseodymium and zirconium ions, and display colors ranging from dark brown via brick red to bright cream. The prepared pigments were characterized by X-ray powder diffraction, transmission electron microscopy, ultraviolet-visible absorption spectroscopy and colorimetrical measurements. Results show that cubic fluorite structure solid solution of 100 nm Ce0.95ZrxPr0.05-xO2particles can be obtained at 1000 °C. There was an effective absorption of visible blue and green in 600 nm, which is originated from the shift of charge transfer band in CeO2by doping of zirconium and praseodymium ions. Effective red hue was obtained for Ce0.95Zr0.02Pr0.03O2composition, which exhibited better L*, a*,and b* values (57.64, 23.83 and 23.78). The coloring mechanism is based on the introduction of an additional electronic energy level of unpaired 4f electron of the lanthanide ion into the cerianite forbidden band. Furthermore, the doping of Zr in Pr-CeO2system raises the slope of the absorption edge with a blue shift resulting in enhanced lightness. The prepared pigments were prospective to be alternatives for toxic pigments used in coloration of plastics.

The Relation of Thin Film Electroluminescence and Photoluminescence Excitation Spectra

1989 ◽  
pp. 105-108
Author(s):  
Zhilin Zhang ◽  
Zhuotong Li ◽  
Biao Mei ◽  
Xueyin Jiang ◽  
Peifang Wu ◽  
...  
Keyword(s):  
Thin Film ◽  
Photoluminescence Excitation ◽  
Excitation Spectra
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