Photoluminescent Green Emission Band Induced by the Systematic Change of -CH3, -OCH3 and Naphthyl Groups in Chiral Imines

2018 ◽  
Vol 18 (2) ◽  
pp. 660-668 ◽  
Author(s):  
O. Portillo Moreno ◽  
F. J. Meléndez Bustamante ◽  
M. Chávez Portillo ◽  
G. E. Moreno Morales ◽  
G. Hernández Téllez ◽  
...  
Keyword(s):  
Emission Band ◽  
Green Emission ◽  
Systematic Change ◽  
Green Emission Band ◽  
Chiral Imines

Green emission band induced by crystal defects in halogenated (-Br, -Cl, -F) chiral imines with a benzo[b]thiophene-based moiety

2019 ◽  
Vol 94 ◽  
pp. 337-347 ◽  
Author(s):  
B. Anzaldo Olivares ◽  
O. Portillo Moreno ◽  
G. Hernández Téllez ◽  
E. Rubio Rosas ◽  
F.J. Meléndez Bustamante ◽  
...  
Keyword(s):  
Emission Band ◽  
Green Emission ◽  
Crystal Defects ◽  
Green Emission Band ◽  
Chiral Imines

Corrigendum to “Green emission band induced by crystal defects in halogenated (-Br, -Cl, –F) chiral imines with a benzo[b]thiophene-based moiety “[Opt. Mater. 94 (2019) 337–347]

2020 ◽  
Vol 99 ◽  
pp. 109628
Author(s):  
B. Anzaldo Olivares ◽  
O. Portillo Moreno ◽  
G. Hernández Téllez ◽  
E. Rubio Rosas ◽  
F.J. Meléndez Bustamante ◽  
...  
Keyword(s):  
Emission Band ◽  
Green Emission ◽  
Crystal Defects ◽  
Green Emission Band ◽  
Chiral Imines

The Origin of the Green Emission Band in Polyfluorene Type Polymers

2006 ◽  
pp. 153-181
Author(s):  
S. Gamerith ◽  
C. Gadermaier ◽  
U. Scherf ◽  
E. J. W. List
Keyword(s):  
Emission Band ◽  
Green Emission ◽  
Green Emission Band

White-Light-Emitting Phosphate Phosphors of SrZn2(PO4)2: Eu2+, Mn2+ Synthesized through Combustion Process

2011 ◽  
Vol 688 ◽  
pp. 344-348
Author(s):  
Xiao Song Yan ◽  
Wan Wan Li ◽  
Kang Sun
Keyword(s):  
Emission Band ◽  
Combustion Process ◽  
Blue Emission ◽  
Green Emission ◽  
Mixture Ratio ◽  
Blue Emission Band ◽  
Light Emitting ◽  
Green Emission Band ◽  
Emission Color ◽  
Emission Light

The SrZn2(PO4)2: Eu2+, Mn2+ phosphors were synthesized through combustion process with varying mixture ratio of Eu2+, Mn2+. The SrZn2(PO4)2: Eu2+, Mn2+ phosphor presents three emission bands under 365nm radiation: the blue emission band of 416 nm from Eu2+ occupying the Sr2+ site, the green emission band of 538 nm and the red emission band of 630 nm from Mn2+ occupying two different Zn2+ sites. Compared with the SrZn2(PO4)2: Eu2+, Mn2+ phosphor prepared through solid state reaction, the luminous intensity of the phosphor is greatly improved through the combustion reaction. White emission light with a high color rending index of 84.7 can be obtained from the phosphor of SrZn2(PO4)2: Eu2+, Mn2+, and the emission color tone of the phosphor varies from blue, white, and finally yellow by increasing the ratio of the concentrations of Eu2+ and Mn2+.

scholarly journals pH Assist for Highly selective determination of Xipamide by the enhancement of the green emission of Tb3+ optical sensor

2014 ◽  
Vol 10 (5) ◽  
pp. 2720-2727 ◽  
Author(s):  
M. S. Attia ◽  
A. O. Yuossef ◽  
M. Diab ◽  
M. F. El-Shahat
Keyword(s):  
Detection Limit ◽  
Optical Sensor ◽  
Emission Band ◽  
Photophysical Properties ◽  
Green Emission ◽  
Accurate Method ◽  
Selective Determination ◽  
Pharmaceutical Tablets ◽  
Green Emission Band

The highly selective, accurate method for determination of Xipamide was maintained. The method depends on the enhancement of the green emission band of Tb3+ at 545 nm in the presence of different concentration of  Xipamide at pH 4.1 and λex = 320 nm in acetonitrile. The photophysical properties of the green  emissive Tb3+  complex have been elucidated, the terbium was used as optical sensor for the assessment of  Xipamide in the pharmaceutical tablets and body fluids with a concentration range 5.0 ×10−9 – 2.3 ×10−6 mol L−1 of xipamide, correlation coefficient of 0.995 and  detection limit of 8.5 ×10−10 mol L−1.

Crystal structure and luminescence properties of a novel promising phosphor Ba3ScB9O18

2007 ◽  
Vol 22 (4) ◽  
pp. 328-333 ◽  
Author(s):  
Gemei Cai ◽  
Ming He ◽  
X. L. Chen ◽  
W. Y. Wang ◽  
Y. F. Lou ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Emission Band ◽  
Light Yield ◽  
Green Emission ◽  
Structural Features ◽  
Luminescence Properties ◽  
X Ray Diffraction ◽  
X Ray ◽  
Green Emission Band ◽  
Excited Luminescence

A novel borate compound Ba3ScB9O18 has been synthesized by solid-state reaction and its structure has been determined and refined from powder X-ray diffraction data. This compound crystallizes in a hexagonal cell (space group P63/m) with lattice parameters a=7.1360(4) Å and c=16.5420(9) Å, and each unit cell contains two formulas. Its crystal structure is made up of planar B3O6 groups parallel to each other along the [001] direction, regular ScO6 octahedra, irregular BaO6 hexagons, and BaO9 polyhedra to form an analogue structure of Ba3YB9O18. DTA and TGA curves for Ba3ScB9O18 show that it is a chemically stable and congruent melting compound. Luminescence properties for Ba3ScB9O18 were investigated using fluorescence spectroscopy and X-ray excited luminescence measurements. Its emission spectrum upon UV excitation (330 nm) has exhibited a prominent blue-green emission band at about 490 nm, and its XEL spectra show an intense emission band in the range of 360 to 500 nm with peak center at 400 nm. The light yield of Ba3ScB9O18 powders is about 23% as large as that of BGO powders under the same measurement conditions. There seems to be a certain relationship between the scintillation properties and the structural features of Ba3ScB9O18.

Green emission band associated with defects in the crystal growth of a new chiral imine

2018 ◽  
Vol 84 ◽  
pp. 646-650 ◽  
Author(s):  
O. Portillo Moreno ◽  
R. Palomino Merino ◽  
G. Hernández-Téllez ◽  
D. Gutiérrez Argüelles ◽  
F. Meléndez Bustamante ◽  
...  
Keyword(s):  
Crystal Growth ◽  
Emission Band ◽  
Green Emission ◽  
Green Emission Band

Thermoluminescence of the green emission band of calcite

2006 ◽  
Vol 161 (10) ◽  
pp. 607-613 ◽  
Author(s):  
C. Soliman ◽  
Saleh M. Metwally
Keyword(s):  
Emission Band ◽  
Green Emission ◽  
Green Emission Band

scholarly journals Experimental and DFT Study of the Photoluminescent Green Emission Band of Halogenated (−F, −Cl, and −Br) Imines

Molecules ◽  
2019 ◽  
Vol 24 (18) ◽  
pp. 3304 ◽  
Author(s):  
Francisco J. Melendez ◽  
María Eugenia Castro ◽  
Oscar Portillo-Moreno ◽  
Guadalupe Hernández-Téllez ◽  
Gloria E. Moreno-Morales ◽  
...  
Keyword(s):  
Phase Transition ◽  
Crystalline Phase ◽  
Emission Band ◽  
Structural Changes ◽  
Green Emission ◽  
Electronic Transitions ◽  
Halogen Atoms ◽  
Green Emission Band ◽  
Crystalline Phase Transition ◽  
Nm Range

The morphological, optical, and structural changes in crystalline chiral imines derived from 2-naphthaldehyde as a result of changing the −F, −Cl, and −Br halogen (−X) atoms are reported. Scanning electron microscopy (SEM), optical absorption, photoluminescence (PL), and powder X-ray diffraction (XRD) studies were performed. Theoretical results of optical and structural properties were calculated using the PBE1PBE hybrid functional and compared with the experimental results. Differences in surface morphology, absorbance, XRD, and PL of crystals were due to the change of halogen atoms in the chiral moiety of the imine. Absorption spectra exhibited the typical bands of the naphthalene chromophore located in the ~200–350 nm range. Observed absorption bands in the UV region are associated with π→π* and n→π* electronic transitions. The band gap energy was calculated using the Tauc model. It showed a shift in the ~3.5–4.5 eV range and the crystals exhibited different electronic transitions associated with the results of absorbance in the UV region. XRD showed the monoclinic→orthorhombic crystalline phase transition. PL spectra displayed broad bands in the visible region and all the samples have an emission band (identified as a green emission band) in the ~400–750 nm range. This was associated with defects produced in the morphology, molecular packing, inductive effect and polarizability, crystalline phase transition, and increase in size of the corresponding halogen atoms; i.e., changes presumably induced by −C−X…X−, −C−X…N−, −C−N…π, and −C−X…π interactions in these crystalline materials were associated with morphological, optical, and structural changes.

Sign in / Sign up

Export Citation Format

Share Document