Synthesis and investigation of optical properties of Ce3+, Dy3+, Eu3+ single doped, Ce3+/ Dy3+ codoped, Ce3+/Dy3+/ Eu3+ triple doped and Yb3+ single doped, Ce3+/Tb3+/ Yb3+ triple doped GDBO3

Taneroğlu, Oğuzcan
The effect of triple doping in photoluminescence has been investigated in recent years, and it could utilize the compounds in terms of some demands. The photoluminescence activity of the materials can be used for quantum cutting solar cells, white light-emitting diodes, flat display panels, optical thermometer, or for the purpose of biosensor, etc. Single doped Ce3+, Dy3+, Eu3+, Yb3+ doped, and Ce3+/Dy3+ codoped, Dy3+/Ce3+/Eu3+ and Tb3+/Ce3+/Yb3+ triple doped GdBO3 nanocompounds were synthesized by sol-gel method using metal oxides and carbonates as precursors in this study. Crystal structure, vibrational band modes, photoluminescence properties of all produced compounds were characterized by X-Ray Diffraction (XRD), IR Transmission, Fluorescence spectrometers, respectively. Besides, the decay lifetimes and quantum yield of selected samples were calculated. Scattering Electron Microscope (SEM) was used for the determination of the morphology of the crystals. The colors of phosphors were determined by CIE 1931 color space chromaticity coordinates. X-Ray patterns prove that all synthesized compounds except for 7% Dy3+ doped one compound have the same crystal structure with pure GdBO3. FTIR results showed that sol-gel all synthesized GdBO3 compounds had B3O99- in their structure. With this study, also, the emission intensity of Dy3+ was ion increased by Ce3+-Dy3+ energy transfer. The emission of Eu3+ was increased by using Dy3+-Eu3+ energy transfer and increased energy of Dy3+ ion in the case of a small amount of Eu3+ ion. Moreover, Ce3+-Tb3+ and Yb3+-Tb3+ energy transfers were examined, and both downconversion and upconversion properties could be measured in one compound. Furthermore, according to luminescence measurements, the colors of the samples can be tuned by codoping.


Investigation into Ex-Situ and In-Situ Iodine Doped Plasma Polymerized Fluorene-type Thin Films
Mansuroglu, Dogan; Uzun Kaymak, İlker Ümit (2019-01-01)
Effect of doping is investigated by applying iodine dopant to plasma polymerized fluorene (C13H10)-type thin films utilizing two separate techniques: ex-situ and in-situ doping. In this study, the thin films are produced using a mixture of biphenyl and methane in a capacitively coupled glow plasma system. Produced thin films are characterized using a fourier transform infrared spectrometer, an ultraviolet-visible spectrometer, a scanning electron microscope, and a two-point probe technique of the current - ...
Tunable White-Light-Emitting Mn-Doped ZnSe Nanocrystals
Sharma, Vijay Kumar; Guzelturk, Burak; Erdem, Talha; Keleştemur, Yusuf; Demir, Hilmi Volkan (2014-03-01)
We report white-light-emitting Mn-doped ZnSe nanocrystals (NCs) that are synthesized using modified nucleation doping strategy. Tailoring three distinct emission mechanisms in these NCs, which are MnSe-related blue emission (410 and 435 nm), Zn-related defect state green emission (520 nm), and Mn-dopant related orange emission (580 nm), allowed us to achieve excitation wavelength tailorable white-light generation as studied by steady state and time-resolved fluorescence spectroscopy. These NCs will be promi...
Diametral strength testing of hydroxyapatites doped with yttrium and fluoride
Evis, Zafer; Sun, Z. P. (2010-10-01)
This study aimed to investigate the diametral strength testing of hydroxyapatite (HA) doped with Y and fluoride with different compositions. Hydroxyapatites were synthesised by precipitation method and sintered at 900, 1100 and 1300 degrees C for 1 h. High amounts of doping caused a decrease in relative densities of HAs. Higher sintering temperatures helped in increasing the relative densities. No second phases were observed by X-ray diffraction spectra of 2.5 mol.-%Y and 2.5 mol.-%F doped HA after the sint...
Enhancement of hydrogen storage properties of Ca3CH antiperovskite compound with hydrogen doping
Gencer, Ayşenur; Surucu, Gokhan (Wiley, 2020-01-01)
The doping effect of hydrogen on the Ca3CHx (x = 1, 4, 7, 9, and 10) antiperovskite compounds has been examined using density functional theory (DFT). The results of the structural optimizations show that all these compounds have negative formation energy implying the energetic stability and synthesizability. The band structures that are essential for the electronic properties have been determined along with the partial density of states (DOS) showing the metallic behavior of these compounds. In addition, t...
Sol-gel synthesis and photocatalytic activity of B and Zr co-doped TiO2
Kapusuz, Derya; PARK, JONGEE; Öztürk, Abdullah (Elsevier BV, 2013-07-01)
Effects of boron (B) and/or zirconium (Zr) doping on photocatalytic activity of sol-gel derived titania (TiO2) powders were investigated. A conventional, non-hydrous sol-gel technique was applied to synthesize the B, Zr doped/co-doped TiO2 powders. Doping was made at molar ratios of Ti/B=1 and Ti/Zr=10. Sol-gel derived xero-gels were calcined at 500 degrees C for 3 h. The crystal chemistry and the morphology of the undoped and B, Zr doped/co-doped TiO2 nanoparticles were investigated using X-ray diffractome...
Citation Formats
O. Taneroğlu, “Synthesis and investigation of optical properties of Ce3+, Dy3+, Eu3+ single doped, Ce3+/ Dy3+ codoped, Ce3+/Dy3+/ Eu3+ triple doped and Yb3+ single doped, Ce3+/Tb3+/ Yb3+ triple doped GDBO3,” M.S. - Master of Science, Middle East Technical University, 2020.