Upconversion Luminescence Study of Er3+ in Gadolinium-Calcium- Silicoborate Glasses

2013 ◽  
Vol 770 ◽  
pp. 249-253 ◽  
Author(s):  
Jakrapong Kaewkhao ◽  
Hong Joo Kim ◽  
Smit Insiripong ◽  
Natthakridta Chanthima ◽  
Siriprapa Kaewjaeng ◽  
...  
Keyword(s):  
Excited States ◽  
Ground State ◽  
Upconversion Luminescence ◽  
Optical Devices ◽  
Electronic Transitions ◽  
Potential Candidate ◽  
Melt Quenching ◽  
Absorption Bands ◽  
Green Is ◽  
Glass Series

The new glass series were prepared in compositions 25Gd2O3-10CaO-10SiO2-(55-x) B2O3-xEr2O3 (where x is 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol %) by normal melt-quenching technique at the melting temperature of 1,400 °C. The optical spectra were measured and shown absorption bands were assigned to appropriate f-f electronic transitions of Er3+ ions from the 4I15/2 ground state to the following excited states: 4G11/2, 2H9/2, 4F5/2, 4F7/2, 2H11/2, 4S3/2, 4F9/2, 4I9/2 and 4I11/2. Single peak from upconversion luminescence was observed at 531 nm (green) is assigned to the 2H11/24I15/2. In this work, the strongest peak at 2.0 % mol of Er2O3 was observed. In this work, suggests that the Er3+ ion in gadolinium calcium silicoborate glasses possibly considered as a potential candidate for applications in upconversion-based optical devices.

Upconversion Luminescence and Optical Studies of Nd3+: Bi2O3–B2O3–P2O5 Glasses

2014 ◽  
Vol 979 ◽  
pp. 390-394
Author(s):  
Natthakridta Chanthima ◽  
Narong Sangwaranatee
Keyword(s):  
Molar Volume ◽  
Ground State ◽  
Glass Matrix ◽  
Luminescence Band ◽  
Upconversion Luminescence ◽  
Optical Studies ◽  
Melt Quenching ◽  
Absorption Bands ◽  
Borophosphate Glass ◽  
Quenching Method

The bismuth borophosphate glass matrix doped with Nd2O3have been prepared by conventional melt quenching method with the molar compositions of 25Bi2O3: 5B2O3: (70-x)P2O5: xNd2O3(where x = 0.2, 0.4, 0.6, 0.8 and 1.0 mol%). The density, molar volume, optical absorption and upconversion luminescnece spectra were studied. It can be seen that the density is not depend on Nd2O3concentration. The molar volume is tending to be decreased with increasing of Nd2O3due to the decrease in the bond length or interatomic spacing between the atoms. Ten absorption bands at 427, 471, 510, 525, 580 , 622, 682, 743, 802 and 873 nm are observed, which could be ascribed to Nd3+transitions from the4I9/2ground state to2P1/2,2G9/2,4G9/2,4G7/2,4G5/2+2G7/2,2H11/2,4F9/2,4F7/2+4S3/2,4F5/2+4H9/2and4F3/2levels. The upconversion luminescence band at 394 nm was observed and the highest emission intensity was obtained at 0.8 mol% of Nd2O3.

Bonding and electronic states of boron in silicon nanowires characterized by an infrared synchrotron radiation beam

Nanoscale ◽  
2015 ◽  
Vol 7 (16) ◽  
pp. 7246-7251 ◽  
Author(s):  
N. Fukata ◽  
W. Jevasuwan ◽  
Y. Ikemoto ◽  
T. Moriwaki
Keyword(s):  
Synchrotron Radiation ◽  
Excited States ◽  
Silicon Nanowires ◽  
Ground State ◽  
Electronic States ◽  
Electronic Transitions ◽  
Synchrotron Radiation Beam ◽  
Radiation Beam ◽  
Acceptor Atom ◽  
Ft Ir

The first report of B local vibrational peaks and electronic transitions of a bound hole from the ground state of a B acceptor atom to excited states by means of micro-FT-IR measurements using an IR-SR beam.

Study on Physical and Photoluminescence Properties of Er3+Doped Zinc Barium Tellurite Glasses

2017 ◽  
Vol 728 ◽  
pp. 155-159 ◽  
Author(s):  
Patarawagee Yasaka ◽  
Yotsakit Ruangtaweep ◽  
Jakrapong Kaewkhao
Keyword(s):  
Molar Volume ◽  
Ground State ◽  
Atmospheric Pressure ◽  
Tellurite Glasses ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
Melt Quenching ◽  
Absorption Bands ◽  
Volume Absorption ◽  
Doped Zno

Er3+-doped ZnO – BaO – TeO2 glasses with the formula (80-x)TeO2–15ZnO–5BaO–xEr2O3 were fabricated using melt quenching technique. The 5 glass samples with different concentrations of Er2O3 were prepared under atmospheric pressure. The samples were investigated on their properties: density, molar volume, absorption spectra and photoluminescence. Density was increased with an increase in Er3+ content. The molar volume trend is in the opposite way to that of the density. The absorption bands are assigned as absorptions from the 4I15/2 ground state to the 4F7/2, 2H11/2, 4S3/2, 4F9/2, 4I9/2, 4I11/2 and 4I13/2 levels. All absorption bands are increase with increasing content of Er3+. The photoluminescence spectra were measured with 980 nm light pumped by flash lamp. The spectra trends to increase with increasing concentration of the dopant.

Visible Luminescence of Eu3+ Ions in Lithium Barium Borate Glass

2016 ◽  
Vol 702 ◽  
pp. 66-70
Author(s):  
Keerati Kirdsiri ◽  
Benchaphorn Damdee ◽  
Jakrapong Kaewkhao
Keyword(s):  
Excited States ◽  
Ground State ◽  
Room Temperature ◽  
State Level ◽  
Barium Borate ◽  
Absorption Bands ◽  
Visible Luminescence ◽  
Barium Borate Glass ◽  
Quench Method ◽  
Ground State Level

Europium doped lithium barium borate glasses were fabricated by conventional melt-quench method and were analyzed their physical, optical and luminescence properties through absorption, excitation, emission and decay analysis at room temperature. The experimental data revealed that the five discrete absorption bands peaking at 393, 464, 532, 2032 and 2212 nm due to the transitions from 7F0 ground state level to various excited states of Eu3+ ions. The luminescence of Eu3+ in visible bands were observed under 394 nm pumping.

Optical absorption spectra of octahedrally bonded Fe3+ in vesuvianite

1968 ◽  
Vol 5 (1) ◽  
pp. 89-92 ◽  
Author(s):  
P. G. Manning
Keyword(s):  
Optical Absorption ◽  
Energy Range ◽  
Absorption Spectra ◽  
Excited States ◽  
Ground State ◽  
Electronic Transitions ◽  
Optical Absorption Spectra ◽  
Sharp Band ◽  
Individual Bands ◽  
The Individual

The optical absorption spectra of green vesuvianite crystals from Lowell County, Vermont, are reported in the energy range 12 000 cm−1 to 30 000 cm−1. The principal absorptions have been attributed to octahedrally bonded Fe3+ and the individual bands have been assigned to spin-forbidden electronic transitions from the 6A1 ground state to excited states in Fe3+. In particular, the 6A1 → 4A14E(G) transition is marked by a relatively sharp band at 21 600 cm−1.

Rotational Structure in Some Higher Excited States of the GeF Molecule

1974 ◽  
Vol 52 (15) ◽  
pp. 1458-1475 ◽  
Author(s):  
R. W. Martin ◽  
A. J. Merer
Keyword(s):  
Emission Spectrum ◽  
Excited States ◽  
Ground State ◽  
Valence State ◽  
Rydberg States ◽  
The Other ◽  
Electronic Transitions ◽  
Lower State ◽  
High Dispersion ◽  
Higher Excited States

The weaker electronic transitions in the region 2000–9000 Å in the emission spectrum of GeF have been photographed at high dispersion; three new transitions with the A2Σ+ state as lower state have been discovered, and the various systems near 2100 and 8600 Å have been reassigned. The spectra have been explained in terms of six excited states lying between 40 000 and 50 000 cm−1 above the ground state, and representative bands involving all six have been analyzed rotationally. Five of these excited states are Rydberg states (5pσ, 5pπ, 4dπ, 4dδ, and 6sσ), and the other is the σπ22Δ valence state; this latter interacts strongly with the 4dδ 2Δ state.

Vibronically induced Jahn–Teller progressions in the electronic spectrum of iridium hexafluoride

1968 ◽  
Vol 46 (15) ◽  
pp. 1721-1724 ◽  
Author(s):  
J. C. D. Brand ◽  
G. L. Goodman
Keyword(s):  
Electronic Spectrum ◽  
Excited States ◽  
Electric Dipole ◽  
Ground State ◽  
Electronic States ◽  
Electronic Transitions ◽  
Electrostatic Forces ◽  
First Approximation ◽  
Jahn Teller

The absorption of IrF6 vapor between 0.7 and 1.3 μ consists of three distinct electronic transitions connecting the Γ8g ground state with higher Γ6g, Γ8g, and Γ7g states of the (5d f2g)3 configuration. In first approximation, Jahn–Teller forces vanish in the two Γ8g states, while the Γ6g and Γ7g states involve Kramers magnetic degeneracy, which cannot be split by electrostatic forces. Accordingly, no splittings of the ν2(eg) or ν5(f2g) excited states are observed in these spectra, but short progressions in ν5 do appear in the electric-dipole-allowed, vibronic parts of these transitions. These progressions are considered to show that Jahn–Teller anharmonicity can be induced by admixtures of odd-parity, orbitally degenerate electronic states, i.e. by the same mechanism through which these transitions derive their electric-dipole intensity.

scholarly journals On the heat of sublimation of carbon and on some absorption bands of three mesomeric hydrocarbons

1941 ◽  
Vol 179 (977) ◽  
pp. 214-231 ◽  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Internuclear Distance ◽  
Ground State ◽  
Spectroscopic Analysis ◽  
Breathing Frequency ◽  
Absorption Bands ◽  
Exact Agreement ◽  
Internuclear Distances ◽  
The One

Spectroscopic analysis of the CO spectrum , together with thermochemical measurements on the burning of carbon in oxygen, lead to the conclusion that L , the heat of sublimation of carbon, is either 124 or 170 kcal./mol. An estimate of L may be made by calculating the energies of excited states of benzene, butadiene and hexatriene, assuming various values of L , and choosing the one that gives the best agreement with experiment. The theory employed bears a close resemblance to that developed by Eyring for estimating activation energies. Almost exact agreement with experiment is obtained in all three cases by assuming L =170, and no agreement is obtained by assuming L = 124. More elaborate calculations are most unlikely to upset this result. The conclusion is therefore that L = 170 kcal./mol. The equilibrium internuclear distances in the excited states are found, and the potential function controlling some of the vibrations about these positions is determined. It is shown that the excited state of benzene has the regular hexagon configuration, the carbon-carbon internuclear distance being 1.45 A, compared with 1.39 in the ground state. The carbon breathing frequency in the excited state is calculated to be 920 cm. -1 , compared with the experimental value 940 cm. -1 .

Optical and Luminescence Characteristic of Dy3+ Doped ZnO-Bao-TeO2 Glass System

2013 ◽  
Vol 431 ◽  
pp. 27-31 ◽  
Author(s):  
K. Boonin ◽  
Patarawagee Yasaka ◽  
J. Kaewkhao
Keyword(s):  
Excited States ◽  
Ground State ◽  
Composition Range ◽  
Photoluminescence Properties ◽  
Luminescence Characteristic ◽  
Melt Quenching ◽  
Excitation Spectra ◽  
Doped Zno ◽  
Glass Matrices ◽  
Xenon Flash

Properties of Dy3+doped ZnO-BaO-TeO2(ZBaT) glass systems with composition 15ZnO-5BaO-(80-x)TeO2-xDy2O3was measured for the composition range 1x8 (in mol%). The glasses were prepared by normal melt quenching technique and characterized their physical, optical and photoluminescence properties. The optical absorption spectra show peaks at4I15/2(466 nm),4F9/2(475 nm),6F3/2(756 nm),6F5/2(804 nm),6F7/2+6H5/2(904 nm),6F9/2+6H7/2(1096 nm),6F11/2+6H9/2(1280 nm) and6H11/2(1640 nm), reflecting the Dy3+in glass matrices. From the excitation spectra, five obvious excitation peaks were observed as follows: The ground state6H15/2to the excited states4M7/2+6P7/2(351nm),4I11/2(366 nm),4I13/2+4F7/2(385 nm),4G11/2(426 nm) and4I15/2(450 nm) of Dy3+. The emission band at 484, 575 and 661 nm arising from the transition4F9/26H15/2,4F9/26H13/2and4F9/26H11/2respectively were observed when the sample was excited by xenon flash lamp at 450 nm. The ZBaT glass doped with 1 mol% of Dy3+gives the highest result for luminescence properties.

Excited-State Dynamics in the RNA Nucleotide Uridine 5’-Monophosphate Investigated by Femtosecond Broadband Transient Absorption Spectroscopy

2019 ◽  
Author(s):  
Matthew M. Brister ◽  
Carlos Crespo-Hernández
Keyword(s):  
Excited State ◽  
Excited States ◽  
Ground State ◽  
Transient Absorption ◽  
Electronic Energy ◽  
Transient Absorption Spectroscopy ◽  
Electronic Relaxation ◽  
Vibrationally Excited ◽  
Excited State Dynamics ◽  
Π State

<p></p><p> Damage to RNA from ultraviolet radiation induce chemical modifications to the nucleobases. Unraveling the excited states involved in these reactions is essential, but investigations aimed at understanding the electronic-energy relaxation pathways of the RNA nucleotide uridine 5’-monophosphate (UMP) have not received enough attention. In this Letter, the excited-state dynamics of UMP is investigated in aqueous solution. Excitation at 267 nm results in a trifurcation event that leads to the simultaneous population of the vibrationally-excited ground state, a longlived <sup>1</sup>n<sub>O</sub>π* state, and a receiver triplet state within 200 fs. The receiver state internally convert to the long-lived <sup>3</sup>ππ* state in an ultrafast time scale. The results elucidate the electronic relaxation pathways and clarify earlier transient absorption experiments performed for uracil derivatives in solution. This mechanistic information is important because long-lived nπ* and ππ* excited states of both singlet and triplet multiplicities are thought to lead to the formation of harmful photoproducts.</p><p></p>

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