scholarly journals Effect of impurities and disordering on the photoluminescence of crystals and glasses in the system Li2O - 7GeO2

2019 ◽  
Vol 27 (1) ◽  
pp. 51-56
Author(s):  
O. V. Ohiienko ◽  
V. N. Moiseienko ◽  
M. D. Volnyanskij
Keyword(s):  
Luminescence Band ◽  
Material Structure ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Broad Luminescence Band ◽  
Intense Luminescence ◽  
Doped Glasses ◽  
Effect Of Impurities ◽  
Oxygen Complexes ◽  
Octahedral Configuration

The work is devoted to the study of photoluminescence spectra of weakly polar ferroelectric crystals Li2Ge7O15 and Li2O – 7GeO2 glasses. For all initial samples was observed the wide intensive luminescence band with maximum in the region of 525–550 nm. The spectral distribution of intensity and the position of the maximum of the band for a Li2Ge7O15 crystal depended on the excitation wavelength (λex=405 nm or 365nm were used). The spectral profile of the luminescence band was broadened in glass containing of 0.67% copper. The intensity of the luminescence band was decreased 6 times for glass doped with Cr3+ ions (0.01%) as compared with glass containing Cu2+ ions. The intense luminescence band of Cr3+ ions with λmax=659nm was appeared starting from 600. The assumption about the nature of the broad luminescence band observed in both nominally pure and doped glasses and crystals was made: the source of luminescence can be germanium - oxygen complexes [GeO4] and [GeO6] of the tetrahedral and octahedral configuration in the material structure.

Preparation and Properties of La2O3-CaO-P2O5 Glasses Doped with Eu3+ Ions

2016 ◽  
Vol 675-676 ◽  
pp. 376-379 ◽  
Author(s):  
Narun Luewarasirikul ◽  
Piyachat Meejitpaisan ◽  
Jakrapong Kaewkhao
Keyword(s):  
Calcium Phosphate ◽  
Molar Volume ◽  
Absorption Spectra ◽  
Room Temperature ◽  
Emission Spectra ◽  
Phosphate Glasses ◽  
Excitation Wavelength ◽  
Melt Quenching ◽  
Volume Measurements ◽  
Doped Glasses

Lanthanum calcium phosphate glasses doped with Eu3+ ions in compositions 20La2O3:10CaO:(70-x)P2O5:xEu2O3 (where x = 0.05, 0.10, 0.50 and 1.50 mol%) were prepared by melt-quenching technique. The density and molar volume measurements were carried out at room temperature. The absorption spectra were investigated in the UV-Vis-NIR region from 200 to 2500 nm. The emission spectra of Eu3+-doped glasses centered at 590 nm (5D0→7F1), 612 nm (5D0→7F2), 652 nm (5D0→7F3) and 699 nm (5D0→7F4) have been observed with 393 nm excitation wavelength.

Origin of the red luminescence band in photoluminescence spectra of ZnSe nanowires

2007 ◽  
Vol 90 (6) ◽  
pp. 063103 ◽  
Author(s):  
U. Philipose ◽  
S. Yang ◽  
T. Xu ◽  
Harry E. Ruda
Keyword(s):  
Luminescence Band ◽  
Photoluminescence Spectra ◽  
Znse Nanowires ◽  
Red Luminescence

Optical Absorption and Photoluminescence Properties of Dy3+ Ions in Bi2O3-SiO2-B2O3 Glass System

2014 ◽  
Vol 979 ◽  
pp. 280-284
Author(s):  
Narong Sangwaranatee ◽  
Yaowaluk Tariwong ◽  
Sunisa Sarachai ◽  
Jakrapong Kaewkhao ◽  
Natthakridta Chanthima
Keyword(s):  
Optical Absorption ◽  
Emission Spectrum ◽  
Molar Volume ◽  
Borosilicate Glass ◽  
Excitation Wavelength ◽  
Optical Absorption Spectra ◽  
Photoluminescence Spectra ◽  
Photoluminescence Properties ◽  
Melt Quenching ◽  
Absorption Bands

This research studied the effect of dysprosium on the physical, optical and luminescence properties of the bismuth borosilicate glass in compositions 40Bi2O3 : 20SiO2 : (40-x)B2O3 : xDy2O3 (where x = 0.0, 0.5, 1.0, 1.5, 2.0 and 2.5 mol%). The glass systems have been prepared at 1100 °C by melt quenching technique. The results showed that the density and molar volume of glass samples are between 4.6477 ± 0.0020 to 5.0047 ± 0.0041 g/cm3 and 45.6608 to 48.6797 cm3/mol, respectively. The values of density and molar volume of these glasses were not depend on the Dy2O3 concentration. The optical absorption spectra of glass samples in the UV-Vis-NIR region shows absorption bands at 794, 906, 1094, 1276 and 1690 nm, respectively. The photoluminescence spectra show emission bands at 482 (blue), 576 (green), 663 (yellow) and 756 (red) nm under 453 nm excitation wavelength. The emission spectrum at 576 nm has shown a strongest intensity.

Laser Spectroscopy of Materials Used in Paintings

1990 ◽  
Vol 185 ◽  
Author(s):  
Londa J. Larson ◽  
Kyeong-Sook Kim Shin ◽  
Jeffrey I. Zink
Keyword(s):  
Laser Spectroscopy ◽  
Excitation Wavelength ◽  
Photoluminescence Spectra ◽  
Bulk Materials ◽  
Drying Oils ◽  
Natural Resins ◽  
Materials Used

AbstractA wide variety of natural resins, waxes, gums, drying oils and proteinaceous materials used on paintings are photoluminescent. The photoluminescence spectra of these materials are reported and discussed. The application of this technique towards the identification of these materials is considered. Both bulk materials and films prepared from selected bulk materials were studied and a comparison is made between the bulk and film samples. Temperature and excitation wavelength studies are reported and discussed for several of the samples.

OPTICAL PROPERTIES OF ANATASE TiO2 UNDER THE HIGH PRESSURE

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3952-3955 ◽  
Author(s):  
TAKAO SEKIYA ◽  
SHINSUKE OHTA ◽  
SUSUMU KURITA
Keyword(s):  
Phase Transition ◽  
High Pressure ◽  
Optical Properties ◽  
Lower Energy ◽  
Luminescence Band ◽  
High Pressures ◽  
Anatase Tio2 ◽  
Broad Luminescence Band ◽  
Pressure Phase ◽  
Energy Side

Optical absorption, luminescence and Raman spectra were measured for anatase TiO 2 under high pressures. The pressure dependence of Raman frequencies is determined. The absorption edge of anatase shifts to higher energy side with increasing pressure and the edge jumps abruptly to lower energy side on the phase transition. A broad luminescence band of anatase shifts also to higher energy side with increasing pressure. These experimental results reveal that the pressure-induced phase transition from anatase to high-pressure phase arises in the range of 4.0-4.6 GPa.

EXCITONIC PHOTOLUMINESCENCE IN PENTACENE SINGLE CRYSTAL

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3753-3756 ◽  
Author(s):  
T. AOKI-MATSUMOTO ◽  
K. FURUTA ◽  
T. YAMADA ◽  
H. MORIYA ◽  
K. MIZUNO ◽  
...  
Keyword(s):  
Absorption Band ◽  
Single Crystals ◽  
Lower Energy ◽  
Luminescence Band ◽  
Laser Light ◽  
Stokes Shift ◽  
Photoluminescence Spectra ◽  
Exciton Luminescence ◽  
Exciton Absorption ◽  
Exciton Absorption Band

Photoluminescence of pentacene single crystals is studied in the temperature range of 7 K to 200 K under excitation with He-Ne laser light. Photoluminescence spectra consist of four broad bands, L1 to L4. The highest energy band, L1, located close to the lowest exciton absorption band mainly appears for //b-polarization. The intensity of the second one, L2, with Stokes-shift of about 1500 cm -1, decreases as temperature rises above 30 K and disappears at 100 K. The bands, L3 and L4, which are located at lower energy, are observed at higher temperatures up to 200 K. Based on their energy positions, the band L2 is assigned to a shallow self-trapped exciton luminescence band, and the bands L3 and L4 to deep self-trapped exciton luminescence bands. By comparing this result with reported result on tetracene crystals, self-trapped excitons are considered to be more stable in pentacene.

Optical and Luminescence Properties of Dy3+ Doped in Soda Lime Borate Glasses

2016 ◽  
Vol 702 ◽  
pp. 51-56 ◽  
Author(s):  
Suwimon Ruengsri ◽  
Nattapon Srisittipokakun ◽  
Falak Zaman ◽  
Gul Rooh ◽  
Jakrapong Kaewkhao
Keyword(s):  
Photo Luminescence ◽  
Soda Lime ◽  
Luminescence Properties ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
White Led ◽  
Photoluminescence Spectra ◽  
Melt Quenching ◽  
Hypersensitive Transition ◽  
Absorption Measurements

The aim of this study is to develop soda lime borate (SLB) doped with Dy3+ glass and investigate their optical and luminescence properties, for different applications in photonics and optoelectronics. The glass were melt by conventional melt quenching technique. Optical properties have been determined by measuring their absorption spectra and luminescence properties were studied by photo luminescence spectra. From optical absorption measurements, there are ten peaks with transition 6H15/2 to 6F11/2 + 6H9/2 at 1262 nm has higher spectral intensity and is a hypersensitive transition. As a result of 350 nm excitation the photoluminescence spectra have four peaks. Higher luminescence intensity peak was observed for 0.5 mol% Dy3+ doped SLB glass at 4F9/2 to 6H13/2 (575 nm). Hence it is suggest from the chromaticity results that SLB glasses with different Dy2O3 concentration may be a promising glass for white LED under 350 nm excitation wavelength. Further investigation is under way for the optimization of different dopend concentration in the SLB glass.

Intensity‐dependent photoluminescence spectra of semiconductor‐doped glasses

1988 ◽  
Vol 53 (8) ◽  
pp. 643-645 ◽  
Author(s):  
J. P. Zheng ◽  
L. Shi ◽  
F. S. Choa ◽  
P. L. Liu ◽  
H. S. Kwok
Keyword(s):  
Photoluminescence Spectra ◽  
Doped Glasses

Physical and optical properties of magnesium sulfoborate glasses doped Dy3+ ions

2016 ◽  
Vol 30 (10) ◽  
pp. 1650054 ◽  
Author(s):  
S. A. Dalhatu ◽  
Karim Deraman ◽  
R. Hussin
Keyword(s):  
Optical Properties ◽  
Excitation Wavelength ◽  
Absorption Bands ◽  
Dysprosium Oxide ◽  
Weak Band ◽  
Hypersensitive Transition ◽  
Prepared Glass ◽  
Intense Luminescence ◽  
Optical Applications ◽  
Yellow Region

The optical properties of alkaline earth borate glasses doped with rare earth are attractive field of research due to many optical applications. We have concentrated on the physical and optical properties of MgO–SO4–B2O3 glass with different concentrations of Dy[Formula: see text] ions. The samples of glass were prepared using the melting quenching technique. The physical parameter and optical properties of the prepared glass were determined. It was observed that the density of the glass samples increased and the molar volume reduced with respect to Dy[Formula: see text] ions content. Dy[Formula: see text]: MgO–SO4–B2O3 glass displayed 10 absorption bands with hypersensitive transition around 1265 nm (6H[Formula: see text]F[Formula: see text]). Two intense luminescence emissions were observed at 482 nm (4F[Formula: see text]H[Formula: see text]: blue) and 573 nm (4F[Formula: see text]H[Formula: see text]: yellow) and weak band at 662 nm (4F[Formula: see text]H[Formula: see text]: red) with excitation wavelength 380 nm. A strong enhancement in the emission peaks at 573 nm in the yellow region was observed with the 0.07 mol% concentration of dysprosium oxide, which may assign to the energy transfer from Mg[Formula: see text] to Mg[Formula: see text] ions. Beyond the optimum concentration, contrary result was observed.

Luminescence Spectra of Erbium Doped Zinc Tellurite Glass Embedded with Gold Nanoparticles

2014 ◽  
Vol 895 ◽  
pp. 231-235
Author(s):  
Md Rahim Sahar ◽  
E. Jaafar ◽  
Sib Krishna Ghoshal
Keyword(s):  
Metallic Nanoparticles ◽  
Tellurite Glass ◽  
Luminescence Spectra ◽  
Excitation Wavelength ◽  
Pl Spectra ◽  
Visible Luminescence ◽  
Erbium Doped ◽  
Doped Glasses ◽  
Gold Nps ◽  
Quenching Method

Understanding the mechanism of visible luminescence enhancement from rare earth doped glasses containing metallic nanoparticles (NPs) is the challenging issue. The photoluminescence (PL) spectra of Er3+: Au-doped tellurite glass is investigated for different concentration of gold NPs. A series of glasses with composition (70-x) TeO2-30 ZnO-0.5 Er2O3x Au where x = (0.1, 0.3, 0.5 mol%) are prepared by melt-quenching method. The thermal parameters such as the glass transition (Tg), crystallization temperature (Tc) and melting temperature (Tm) are determined using DTA thermogram. PL spectra exhibit two distinct peaks at 493nm and 550nm which are assigned to the2H11/2-4I15/2and4S3/2-4I15/2transition respectively. The influence of gold NPs in enhancing the luminescence intensity under the 360nm excitation wavelength is observed understood.

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