A Strong Blue Emission Band from Silica Nanospheres Modified with Chlorotrimethylsilane

2005 ◽  
Vol 26 (4) ◽  
pp. 483-486 ◽  
Author(s):  
Jin Mu ◽  
Leihua Xu ◽  
Xubin Gao ◽  
Yunyan Zhang
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Silica Nanospheres ◽  
Blue Emission Band ◽  
Strong Blue Emission

Exciton-phonon interactions observed in blue emission band in Te-delta-doped ZnSe

2008 ◽  
Vol 104 (3) ◽  
pp. 033531 ◽  
Author(s):  
M. Jo ◽  
Y. Hayashi ◽  
H. Kumano ◽  
I. Suemune
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Blue Emission Band

Zur Bildung und Umwandlung der „blauen“ und „grünen“ Zentren im goldaktivierten Zinksulfid / On the Formation and Conversion of “Blue” and “Green” Centres in Gold-Activated Zinc Sulphide

1979 ◽  
Vol 34 (2) ◽  
pp. 262-264 ◽  
Author(s):  
K. Kynev ◽  
V. Kuk
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Zinc Sulphide ◽  
Blue Emission Band ◽  
Gas Atmosphere

Abstract The phosphor ZnS-Au activated in the presence of zinc exhibits a blue emission band (Emax = 2,58 eV) which can be ascribed to associated Au′Zn-Vׄs-centres. A reversible interconversion of “blue” and “green” centres is achieved by retiring the phosphor samples in a suitable gas atmosphere

Effect of Microwave Irradiation Synthesis of ZnO Nanoparticles

2016 ◽  
Vol 19 (1) ◽  
pp. 021-026 ◽  
Author(s):  
Chelladurai Amutha ◽  
Balan Natarajan ◽  
Sethuramachandran Thanikaikarasan ◽  
Adaikalam Cyrac Peter ◽  
Thaiyan Mahalingam ◽  
...  
Keyword(s):  
Microwave Irradiation ◽  
Emission Band ◽  
Blue Emission ◽  
Hexagonal Structure ◽  
X Rays ◽  
X Ray Diffraction ◽  
Ultraviolet Emission ◽  
Blue Emission Band ◽  
Diffraction Patterns ◽  
Bending Modes

Zinc Oxide nanoparticles were synthesized from zinc acetate by microwave irradiation method. X-ray diffraction patterns showed that the prepared samples found to exhibit hexagonal structure. Surface morphology and presence of elements have been analyzed using scanning electron microscopy and energy dispersive analysis by X-rays. The presence of stretching and bending modes in the prepared samples has been determined using Fourier transform infrared spectroscopy. Optical absorption analysis showed that the prepared samples possess band gap value around 3.02 eV. Photoluminescence spectroscopic analysis indicated a strong ultraviolet emission band at 390 nm and a weak blue - green band and weak blue emission band at 484 and 444 nm respectively.

Blue emission band in compensated GaN:Mg codoped with Si

2003 ◽  
Vol 68 (4) ◽  
Author(s):  
B. Han ◽  
J. M. Gregie ◽  
B. W. Wessels
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Blue Emission Band

A New Salt-Inclusion Single-Phased White Phosphor Ba7B3SiO13Br:Dy3+ for White Light-Emitting Diodes

2019 ◽  
Vol 803 ◽  
pp. 93-97
Author(s):  
Hai Dong Ju ◽  
Bao Ling Wang ◽  
Qi Mei Yang
Keyword(s):  
White Light ◽  
Emission Band ◽  
Light Emitting Diodes ◽  
Hexagonal Phase ◽  
Blue Emission ◽  
Yellow Emission ◽  
Conventional Solid State Reaction ◽  
Blue Emission Band ◽  
Light Emitting ◽  
White Light Emitting Diodes

A series of Ba7B3SiO13Br:Dy3+ phosphors were synthesized by a conventional solid-state reaction method for the first time. The X-ray diffraction patterns confirmed that the samples were pure phase and crystallized in a hexagonal phase with a space group of the P63mc (186). The luminescence spectrum exhibited a strong blue emission band peaked at 478 nm, a strong yellow emission band at 575 nm and a weak emission band at 665 nm, corresponding to the transitions from 4F9/2 to 6H15/2, 6H13/2 and 6H13/2 of Dy3+, respectively. According to the emission spectrum of Ba6.92B3SiO13Br:0.08Dy3+ excited at 349 nm, the chromaticity coordinate was calculated to be (0.317, 0.358) located on the white light region. The concentration quenching mechanism of Dy3+ in Ba7B3SiO13Br was ascribed to the multipolar-multipolar interaction. The current researches suggested that the phosphor can be used as a white phosphor suitable for white light-emitting diodes.

scholarly journals SrAl2O4:Eu2+(,Dy3+) Nanosized Particles: Synthesis and Interpretation of Temperature-Dependent Optical Properties

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Huayna Terraschke ◽  
Markus Suta ◽  
Matthias Adlung ◽  
Samira Mammadova ◽  
Nahida Musayeva ◽  
...  
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Emission Spectra ◽  
Green Emission ◽  
Spectroscopic Properties ◽  
Host Lattice ◽  
Nanosized Particles ◽  
Temperature Dependent ◽  
Excitation Spectra ◽  
Blue Emission Band

SrAl2O4nanosized particles (NPs) undoped as well as doped with Eu2+and Dy3+were prepared by combustion synthesis for the discussion of their intensively debated spectroscopic properties. Emission spectra of SrAl2O4:Eu2+(,Dy3+) NPs are composed by a green band at 19 230 cm−1(520 nm) at room temperature, assigned to anomalous luminescence originated by Eu2+in this host lattice. At low temperatures, a blue emission band at 22 520 cm−1(444 nm) is observed. Contrary to most of the interpretations provided in the literature, we assign this blue emission band very reliably to a normal 4f6(7FJ)5d(t2g)→4f7(8S7/2) transition of Eu2+substituting the Sr2+sites. This can be justified by the presence of a fine structure in the excitation spectra due to the different7FJlevels (J=0⋯6) of the 4f6core. Moreover, Fano antiresonances with the6IJ(J=9/2,7/2) levels could be observed. In addition, the Stokes shifts (ΔES=1980 cm−1and 5 270 cm−1for the blue and green emission, resp.), the Huang-Rhys parameters ofS=2.5and 6, and the average phonon energies ofħω=480 cm-1and 470 cm−1coupled with the electronic states could be reliably determined.

Study of Growth and Characterization of Fe-Catalyzed β-Ga2O3 Nanowires

2015 ◽  
Vol 1751 ◽  
Author(s):  
Sudheer Kumar ◽  
C. Tessarek ◽  
A. Hähnel ◽  
S. Christiansen ◽  
R. Singh
Keyword(s):  
Emission Band ◽  
Blue Emission ◽  
Chemical Vapor ◽  
Luminescence Properties ◽  
Chemical Vapor Deposition Method ◽  
X Ray Diffraction ◽  
Blue Emission Band ◽  
Single Crystalline ◽  
Transmission Electron ◽  
High Resolution Tem

ABSTRACTIn the present study, Fe as a catalyst was used to grow single crystalline monoclinic gallium oxide (β-Ga2O3) nanowires using chemical-vapor-deposition method. The morphology, structure and luminescence properties of the as-grown β-Ga2O3 nanowires were investigated using various characterization techniques. The diameter of the as-grown nanowires was in the range of 50 to 100 nm, and the lengths up to tens of micrometers. The structural investigation of the nanowires was carried out using X-ray diffraction that showed monoclinic phase of Ga2O3. Further, the transmission electron microscope (TEM) investigations along with selected area diffraction pattern revealing single crystalline nature of the nanowires. The as-grown β-Ga2O3 nanowires had preferred orientation along [1-1-1] direction. The high resolution TEM image showed regular arrangement of atoms and the lattice spacing between (1-1-1) planes was around 0.266 nm. The luminescence properties of the as-grown nanowires were measured using cathodoluminescence (CL) spectroscopy. The CL measurements of β-Ga2O3 nanowires revealed a strong broad UV-blue emission band and a weak red emission band.

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