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1
Content available Germanate glasses co-doped with Ce3+/Ln3+ (Ln = Pr, Tb, Dy) for white light emitting diodes
Górny Agata, Sołtys Marta, Pisarska Joanna, Pisarski Wojciech A.
Optica Applicata
|
2019
|
Vol. 49, nr 3
383--391
EN
Glasses doped with lanthanides ions may be good white light emitters due to their interesting physical and spectroscopic properties. In this paper, the optical spectroscopy of rare earths doped glasses with a special emphasis on application as white LED were presented. The luminescent glass materials containing Ln3+ (Ln = Pr, Tb, Dy) and Ce3+ ions were obtained. The glasses samples were prepared by a traditional melt-quenching technique. The optical properties of glasses containing various concentrations of rare earth ions were analyzed. It was observed that luminescence bands corresponding to characteristic transitions of Ln3+ and cerium ions are present on spectra measured under direct excitation of Ce3+. Therefore, it indicates that the energy transfer process between Ce3+ /Pr3+, Ce3+ /Tb3+, Ce3+ / Dy3+ ions in glasses occurs. Some parameters such as correlated color temperature (CCT) and chromaticity coordinates (CIE) that characterize white LEDs were analyzed and discussed in detail.
2
Erbium/Ytterbium co-doped oxyfluoride glass-ceramics — promising candidate for fiber lasers and optical amplifiers at 1550 nm
Żelechower M., Czerska E., Augustyn E.
Inżynieria Materiałowa
|
2016
|
Vol. 37, nr 6
341--349
EN
The manufacturing of the erbium/ytterbium co-doped oxyfluoride glass-ceramics optical fiber was discussed on the background of literature review and own achievements. The role of erbium ions as NIR emitters as well as ytterbium ions in the process of stimulated emission has been explained and illustrated by several figures both from the literature and the author’s results. Glass-ceramics material advantage over glassy fibers was also considered and proved by several plots and images. The relations between the g-c materials and their optical features have been illustrated by results of SEM/TEM imaging, X-ray spectra, XRD and SAED patterns, thermal analysis (DTA/DSC) and a corresponding absorption/emission NIR spectra.
PL
Zamiarem autorów było zaprezentowanie pewnego ciągu myślowego, który doprowadził wraz z aktywnymi działaniami na tym polu do pojawienia się komercyjnie dostępnych laserów włóknowych oraz wzmacniaczy optycznych dla linii światłowodowych. W procesie dochodzenia do rozwiązań komercyjnych etapami były: dobór szkieł o odpowiedniej transmisji, wybór aktywatora (erb), technologia wyciągania włókien optycznych o strukturze rdzeń–płaszcz oraz wybór metody wytworzenia rezonatora. W artykule omówiono dodatkowe aspekty poszczególnych etapów, w tym zastosowanie szkło-ceramiki zamiast szkła w rdzeniu włókna i wymuszoną przez to specyficzną technologię nakładania płaszcza. Wymienione etapy scharakteryzowano, wykorzystując rysunki i wykresy zaczerpnięte z opracowań wielu autorów, a także własne wyniki.
3
Content available Red photonic glasses and confined structures
Gonçalves R. R., Lukowiak A., Ristic D., Boulard B., Chiappini A., Chiasera A., Dorosz D., Marciniak M., Righini G. C., Ferrari M.
Bulletin of the Polish Academy of Sciences. Technical Sciences
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2014
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Vol. 62, nr 4
647--653
EN
We present some recent results obtained by our team in rare earth doped photonic glasses and confined structures, in order to give some highlights regarding the state of art in glass photonics. To evidence the unique properties of transparent glass ceramics we compare spectroscopic and structural properties between the parent glass and the glass ceramics. Starting from planar waveguides we move to spherical microresonators, a very interesting class of photonic confined structures. We also conclude the short review with some remarks about the perspective for glass photonics.
4
Content available remote Lantanowce w szkłach chalkogenidkowych
Reben M., Burtan B.
Materiały Ceramiczne
|
2012
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T. 64, nr 2
248-251
PL
W artykule przedstawiono technologię syntezy szkieł tellurowych aktywowanych wybranymi pierwiastkami ziem rzadkich (RE). Celem pracy było zbadanie wpływu aktywnych domieszek Nd3+, Er3+ oraz Pr3+ na wybrane parametry optyczne. Zbadano wpływ aktywnych domieszek na współczynnik załamania światła. Pomiary optyczne wykonano przy użyciu elipsometru spektroskopowego M2000 firmy Woollam w zakresie widmowym 190-1700 nm. Krzywe doświadczalne w zakresie 300-1700 nm przypominają swoim kształtem krzywą Cauchy'ego, dlatego też zastosowano taki model teoretyczny dopasowania do wartości eksperymentalnych kątów ? i ?. Wpływ pierwiastków RE na charakter przejść radiacyjnych dla poziomów wzbudzonych jonów Nd3+, Er3+ oraz Pr3+ wyznaczono przy użyciu standardowej teorii Judd-Ofelta.
EN
The synthesis of tellurite glasses doped with rare earth (RE) is presented. The study is focused on investigation of the effect of Nd3+, Er3 + and Pr3 + active dopants on selected optical properties of tellurite glasses. The refractive index of the glasses was measured. The spectral dependence of ellipsometric angles ? and ? of the tellurite glass samples was determined. The optical measurements were conducted on Woollam M2000 spectroscopic ellipsometer in a spectral range of 190-1700 nm. The radiative transition probabilities for excited levels of Nd3+, Er3+, Pr3+ have been calculated using the standard Judd-Ofelt (J-O) theory.
5
Content available remote Photofunctional terbium centered inorganic/organic hybrid material with the functionalized 5-dihydroxybenzoate linkage
Li Y., Sui Y. L., Yan B.
Materials Science Poland
|
2012
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Vol. 30, No. 1
39--44
EN
In this study, silica-based organic-inorganic hybrids were prepared using sol-gel methods. A new kind of monomer (DHBA-TESPI) was derived by modifying the double hydroxyl groups of 3, 5-dihydroxybenzoic acid (DHBA) with 3-(triethoxysilyl)-propyl isocyanate (TESPI) through the addition reaction. Then, the obtained compound and tetraethoxysilane (TEOS) were used as the inorganic and organic counterparts respectively. Coordination reaction between Tb3+ and the carboxylic groups of the monomer happen simultaneously. IR, NMR, UV/Vis absorption, low-temperature phosphorescence spectroscopy and fluorescence spectroscopy were used to characterize the hybrids. The final materials exhibited strong green-colored fluorescence (Tb3+), which can be explained by the intramolecular energy transfer caused by coordination of the organic counterpart. The spectroscopic data also revealed that the triplet state energy of the organic ligand matches the emissive energy level of Tb3+.
6
Content available remote Materiały szkło-ceramika na bazie InF3
Ślęzok M.
Szkło i Ceramika
|
2011
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R. 62, nr 2
17-21
PL
Materiały typu szkło-ceramika łączą w sobie zalety ośrodka szklistego oraz cechy ośrodka krystalicznego. W artykule przedstawiono wyniki badań mających na celu opracowanie na bazie InF3 materiałów typu szkło-ceramika, zawierających w ich fazach krystalicznych pierwiastki aktywne (Pr (sup)+3 i Tm (sup)+3) o właściwościach pozwalających na użycie tych nowych produktów do budowy elementów optoelektronicznych. Określono technologiczne warunki tworzenia się faz krystalicznych, a także wyznaczono luminescencyjne charakterystyki powstałych materiałów.
EN
The glass-ceramic materials combine advantages of both vitreous centre and crystalline centre in which the environment of optically active element's ion is structurally organized. The aim of the research was to gain transparent glass-ceramic materials based on lnF3 with increased concentration of active elements (Pr (sup)+3 and Tm (sup)+3) in crystalline phase. The properties of obtained materials show that is possible to use them in optoelectronics. The technological conditions of crystallization are described. The luminescence characteristics of obtained materials are showed.
7
Content available remote Spectroscopic investigations of rare-earth materials for luminescent solar concentrators
Kozłowska A., Nakielska M., Sarnecki J., Lipińska L., Jeremiasz O., Podniesiński D., Malag A.
Optica Applicata
|
2011
|
Vol. 41, nr 2
359--365
EN
The spectroscopic analysis of materials for luminescent solar concentrators (LSC) is presented. The samples of polymethyl mathacrylate (PMMA) polymer matrix containing nanocrystals Nd,Yb:Y3Al5O12 (Nd,Yb:YAG), Nd,Yb:Gd3Ga5O12 (Nd,Yb:GGG) and Nd,Yb:Y2O3 (Nd,Yb:YO) were prepared. The nanocrystals were obtained via the (Pechini) modified sol-gel method. Spectroscopic investigations were performed for the nanocrystals before and after incorporating them in LSC plates. In the experiment, two diode lasers (DL) were used as excitation sources: DL operating at 808 nm to excite Nd3+ ions and DL operating at 976 nm for direct excitation of Yb3+ ions. Strong fluorescence signal from Yb3+ ions by 808 nm excitation proved an efficient energy transfer from Nd3+ to Yb3+ ions. The spectroscopic results indicate the successful incorporation of nanosized crystals into PMMA matrix. The best effects were obtained for Nd,Yb:YAG and Nd,Yb:GGG nanocrystals. Presented results show that polymer materials with nanocrystals doped by rare earth ions are promising solution for photovoltaic applications offering stability and emission in the spectral range matched to the maximum sensitivity of a silicon solar cell.
8
Content available remote Influence of PbX2 (X = F, Cl, Br) content and thermal treatment on structure and optical properties of lead borate glasses doped with rare earth ions
Pisarska J., Lisiecki R., Dominiak-Dzik G., Ryba-Romanowski W., Goryczka T., Grobelny Ł., Pisarski W. A.
Optica Applicata
|
2010
|
Vol. 40, nr 2
351--358
EN
Oxyhalide lead borate glasses doped with rare earth ions have been studied before and after thermal treatment. The rare earths as optically active ions were limited to the Er3+ ions. Near-infrared luminescence due to the main 4I13/2–4I15/2 laser transition of Er3+ was registered. The introduction of PbX2 to the borate glass results in a reduction of spectral linewidth and an increase of luminescence lifetime of 4I13/2 state of Er3+ ions. The unusual large spectral linewidth for 4I13/2–4I15/2 transition of Er3+ in the oxide glass host was obtained, whereas the luminescence decay from 4I13/2 state is longer for a sample with PbF2 than PbCl2 and PbBr2. Heat treatment introduces transformation from a glass to transparent glass-ceramic (TGC). The coordination sphere around Er3+ ions is changed, giving important contribution to the luminescence characteristics. The spectroscopic consequence of this transformation is the increase of luminescence lifetime and the narrowing of spectral lines of Er3+.
9
Content available Influence of active admixtures onto tellurite glass refractive index
Reben M., Wasylak J., Jaglarz J.
Bulletin of the Polish Academy of Sciences. Technical Sciences
|
2010
|
Vol. 58, nr 4
519-522
EN
The goal of this work was to investigate the influence of rare earth ions such as Tm3+, Yb3+ on physico-chemical properies of tellurite glass from the TeO2-WO3-PbO-PbF2-Na2O system. The thermal characteristic of tellurite glass Tm3+, Yb3+ doped have been presented. The effect of the glass crystallization on thermal stability of the glass and crystallizing phases formed upon heat treatment were investigated by DTA/DSC/, XRD methods. The spectral dependence of ellipsometric angles of the tellurite glass samples, have been studied. The influence of ions of rare earth elements, i.e. Tm 3+ and Yb3+, onto changes of refractive index of glass P1 (without RE admixture) were examined. The optical measurements were conducted on Woollam M2000 spectroscopic ellipsometer, in spectral range of 190–1700 nm.
10
Content available remote Near-infrared luminescence of rare earth ions in oxyfluoride lead borate glasses and transparent glass-ceramic materials
Pisarska J., Ryba-Romanowski W., Dominiak-Dzik G., Goryczka T., Pisarski W.A.
Optica Applicata
|
2008
|
Vol. 38, nr 1
211-216
EN
Oxyfluoride lead borate glasses singly doped with Nd3+ and Er3+ ions have been studied before and after thermal treatment. The orthorhombic PbF2 crystallites are formed during thermal treatment, which was evidenced by X-ray diffraction analysis. Near-infrared luminescence spectra at 1.06 žm and 1.53 žm have been registered for samples before and after annealing, which correspond to the main 4F3/2-4I11/2 and 4I13/2-4I15/2 laser transitions of Nd3+ and Er3+ ions, respectively. Luminescence decays from 4F3/2 state of Nd3+ and 4I13/2 state of Er3+ have been analyzed in detail. Contrary to Nd-doped samples, the luminescence lines obtained for Er-doped transparent oxyfluoride glass-ceramics are more intense and narrowed, whereas the luminescence decays from 4I13/2 state of Er3+ are slightly longer in comparison to precursor glasses.
11
Content available Extractive separation of rare earth ions by using calix[4]arene with isopropyl hydrogen phosphonate at upper rim
Ohto K., Yamasaki T., Inoue K.
Ars Separatoria Acta
|
2006
|
No. 4
96-106
EN
5,11,17,23-Tetrakis(isopropyl hydrogen phosphonomethyl)- 25,26,27,28 - tetrapropoxycalix[4]arene in cone conformation has been synthesized to investigate extraction behavior for nine trivalent rare earth metal ions from chloride media into chloroform, together with isopropyl hydrogen (4-propoxyphenyl)methylphosphonate as a corresponding monomer. Although the aqueous distributions of the present extractants were greater than those of butyl ester type of the previous extractants, they were trace and slight amounts under the experimental condition for calix[4]arene and monomeric derivatives, respectively. From the result of pH dependency, extraction takes place by a simple ion-exchange mechanism for both extractants. The extraction ability between the present extractants for rare earth ions was comparable. Results of a Job plot and a loading test indicate that for calix[4]arene derivative, stoichiometry of the extraction is 1:1. The separation efficiency of a calix[4]arene derivative is less than that of a monomeric derivative. It is attributed to the offset by the size effect of a coordination site at the larger upper rim of calix[4]arene (for relatively larger light rare earth ions) and strong affinity of phosphonate group to heavy rare earth ions. Such result is similar to that of derivatives with butyl ester.
12
Content available remote Energy transfer from Yb to X (X = Tm, Er) in lead borate glasses
Pisarska J., Ryba-Romanowski W., Dominiak-Dzik G., Goryczka T., Pisarski W.A.
Optica Applicata
|
2005
|
Vol. 35, nr 4
837-842
EN
Energy transfer processes in lead borate glasses doubly doped with Yb-Tm and Yb-Er have been investigated at room temperature under excitation of Yb at 975 nm. The non-resonant energy transfer from 2F5/2 state of Yb to 3H5 state of Tm results in up-converted emission at 850 nm due to the 3H4-3H6 transition of thulium ions. The nearly resonant transfer from 2F5/2 state of Yb to 4I11/2 state of Er results in green up-conversion and near-infrared emission, which correspond to the 4S3/2-4I15/2 and 4I13/2-4I15/2 transitions of erbium ions, respectively. High Yb concentration in both co-doped samples is required for optimal energy transfer efficiency (h > 90%). Results with the singly Yb-doped samples are also presented to clarify the energy transfer process.
13
Luminescence of Bismuth, cerium and Terbium in Alkaline Earth Borates
Xie Y., Zhang S., Zeng Q.
Polish Journal of Chemistry
|
2004
|
Vol. 78 / nr 10
1885-1892
EN
The luminescence of Bi3+, Ce3+ and Tb3+ -activated BaB8O13 and Sr-borates are studied. The emission peak of Ce3+ in alkaline earth borates shifts to higher energy side with decreasing ratio of SrO/B2O3. The energy transfer from Ce3+ to Tb3+ in BaB8O13is studied.
14
Content available remote Ring core fibre as an optical amplifier
Dorosz J.
Optica Applicata
|
2004
|
Vol. 34, nr 4
515-530
EN
The ring shape of doped rare earth fibre (M-profile fibre) offers the possibility of stimulating luminescence from inside of the fibre with higher efficiency of coupling. In this type of fibre, the inner and outer claddings have lower than the ring core refraction index. The pump light is guided by the multimode inner cladding and the laser light is guided by the doped rare earth ions ring-core. The pump absorption is almost complete because of the geometry of that kind of fibre construction. In this paper, a ring coredoped Dy3+ ionsfibre is presented. In the first part of this report, an analysis of light transfer between inner cladding and ring-core optical fibre is presented. In the second part, the parameters of Dy3+ions doped ring core optical fibre manufactured by author are described. It seems that this kind of fibre may be used for optical amplifier construction.
15
Investigations of Pr 3+ - doped fluoroindate glass. Synthesis, properties and applications.
Pisarska J., Pisarski W.A.
Archiwum Nauki o Materiałach
|
2004
|
T. 25, nr 1
37-51
EN
Multicomponent fluoroindate glasses are promising materials for ultra-low loss mid-infrared optical fibers. Upon doping with rare earth ions, fibers are suitable for the development of blue lasers, tunable lasers, up-conversion lasers, high power laser materials and optical amplifiers for telecommunication systems. Characterization of glassy materials based on indium fluoride doped with Pr 3+ ions is reported using XRD, EPMA, DSC, IR and optical spectroscopy as well as their potential applications.
PL
Wieloskładnikowe szkła fluoroindowe są obiecującym materiałem do otrzymywania włókien optycznych mających zastosowanie w zakresie średniej podczerwieni. W wyniku aktywowania szkieł jonami ziem rzadkich stają się przydatne w konstrukcji lasera niebieskiego, konwertora promieniowania podczerwonego na światło widzialne, laserujących materiałów dużej mocy czy wzmacniaczy optycznych dla układów telekomunikacyjnych. W pracy przedstawiono charakterystykę szkieł opartych na fluorku indu domieszkowanych jonami prazeodymu. Badania przeprowadzono z zastosowaniem metod rentgenowskiej analizy fazowej (XRD), mikroanalizy rentgenowskiej (EPMA), różnicowej kalorymetrii skaningowej (DSC), spektroskopii w podczerwieni (R) i optycznej.
16
Struktura i właściwości spektroskopowe kryształów ABCO4 (A = Sr, Ba; B = La-Gd; C = Al, Ga) domieszkowanych jonami ziemi rzadkiej i metali przejściowych.
Pisarski W.A.
Archiwum Nauki o Materiałach
|
2001
|
T. 22, nr 3
215-232
PL
W artykule przedstawiono strukturę krystaliczną i właściwości spektroskopowe kryształów nieuporządkowanych, należących do rodziny związków o wzorze ogólnym ABCO4, gdzie A = Sr, Ba; B = La-Gd; C = Al, Ga. Pierwsza część artykułu zawiera wybrane informacje na temat struktury badanych materiałów. W drugiej części zaprezentowano wyniki badań absorpcyjnych i luminescencyjnych kryształów ABCO4 domieszkowanych jonami Eu3+, Cr3+ i Nd3+, które wykazują silne niejednorodne poszerzenie linii spektralnych.
EN
Crystal structure and some spectroscopic and optical properties of disordered crystals belonging to the big wide family of compounds with the general chemical formula ABCO4 (where A is Sr or Ba; B is a rare earth element and C stands for Ga, Al or a transition element) have been examined. The first part of this paper presents some information about structural characterization of the investigated materials. In the second part optical absorption and photoluminescence of Eu3+, Cr3+ and Nd3+ ions in ABCO4 crystals, indicating strong inhomogeneous broadening of spectral lines were studied in great detail.
17
Content available remote Optical properties of fluoroindate glasses doped with rare earth ions.
Gabryś-Pisarska J., Żelechower M., Pisarski W.A., Gołąb S., Bałuka M., Ryba-Romanowski W.
Optica Applicata
|
2000
|
Vol. 30, nr 4
517-528
EN
Multicomponent indium based fluoride glass singly doped with europium, terbium, holmium and thulium has been investigated using methods of optical spectroscopy. Owing to low energy of phonons available in the glass matrix, the luminescent levels of rare earth ions are depopulated mainly by radiative transitions and nonradiative ion-ion interaction. The latter mechanism has been found to govern the relaxation dynamics of the /sup 5/D/sub 2/, /sup 5/D/sub 1/ levels of europium, the /sup 5/D/sub 3/ level of terbium, the /sup 5/S/sub 2/ level of holmium and the /sup 2/D/sub 5/, /sup 1/G/sub 4/ and /sup 3/H/sub 4/ levels of thulium when the activator concentration amounts to several mol%.
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