Investigations on the photoluminescence spectra and its defect-related nature for the ultraviolet transmitting fluoride-containing phosphate-based glasses

Feng, Dandan; He, Quanlong; Lü, Min; Li, Weinan; Song, Weiwei; Wang, Pengfei; Peng, Bo

doi:10.1016/j.jnoncrysol.2015.06.009

Cited by 24 publications

(13 citation statements)

References 35 publications

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“…with impurity levels in the ppb range). Moreover, ultra-highly pure fluorophosphate glasses may also show a better long-term radiation resistance to UV light [19] since their optical basicity (electron donor power of the glass matrix) is lower in comparison with silica glass, due to a lower content of non-bridging oxygens when the phosphate content is low. The UV radiation damage of such glass is known to be directly related to the amount of phosphate groups and the presence of metallic impurities within the glassy network [15,16,18e21].…”

Section: Introductionmentioning

confidence: 99%

UV-transmitting step-index fluorophosphate glass fiber fabricated by the crucible technique

et al. 2017

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a b s t r a c tIn this study, we report on the fabrication process of highly pure step-index fluorophosphate glass optical fibers by a modified crucible technique. High-purity fluorophosphate glasses based on 10 mol% of barium metaphosphate and 90 mol% of metal fluorides (AlF 3 eCaF 2 eMgF 2 eSrF 2 ) have been studied in order to produce step-index optical fibers transmitting in the deep-ultraviolet (DUV) region. The characteristic temperatures, viscosity around softening temperature and optical transmission in the UVevisible region of the prepared bulk glasses were characterized in a first step. The selected glass compositions were then used to prepare core-cladding optical preforms by using a modified built-in casting technique. While uncontrolled crystallization of the fiber was observed during the preform stretching by using the conventional method, we successfully obtained crystal-free fiber by using a modified crucible technique. In this alternative approach, the produced core-cladding preforms were inserted into a home-designed fused silica crucible assembly and heated at 643 C to allow glass flowing throughout the crucible, preventing the formation of crystals. Single index fluorophosphate glass fibers were fabricated following the same process as well. The optical attenuation at 244 nm and in the interval 350e1750 nm was measured on both single index and step-index optical fibers. Their potential for using in DUV applications is discussed.

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Section: Introductionmentioning

confidence: 99%

UV-transmitting step-index fluorophosphate glass fiber fabricated by the crucible technique

et al. 2017

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“…The absorption coefficient α in many amorphous semiconductors shows an exponential dependence on photon energy usually obeying the empirical relation. The band gap of Phellodendron phosphor (E g ) was determined by using Tauc's plot [43][44][45][46] .…”

Section: Resultsmentioning

confidence: 99%

Phellodendron chinense Schneid: A novel yellow-emitting luminescent material for white light-emitting diodes

Lin

Hsu

Shiu³

et al. 2017

Sci Rep

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To facilitate the next generation of environmental material for white light emitting diodes, the discovery of natural luminesce is essential. In this study, we disclose a rare-earth free and yellow-emission phosphor, Phellodendron, which could be both excited by near ultraviolet light and blue light. The new yellow phosphor is obtained by extraction of Phellodendron chinense Schneid. The emission wavelength, full width at half maximum and CIE coordinates of extracted Phellodendron are 540 nm, 120 nm and (0.41, 0.55), respectively. The corresponding luminescent properties of Phellodendron are characterized by PL, PLE, reflection spectra, FITR and decay lifetime. Surprising thing is luminous intensity of Phellodendron phosphors excited at 380 nm was stronger than YAG:Ce phosphor by more than 139%. In addition, we firstly introduce the yellow phosphor in white LED fabrication by combining blue chip and Y3Al5O12:Ce3+ phosphor, to create warm white. For comparison, red-emission CaAlSiN3:Eu2+ phosphors are also introduced for LED package tests. The results demonstrate that Phellodendron is a potential candidate for white LED applications.

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“…The spectra show broad bands at ~400, ~500 and in the 600-700nm range, which have previously been attributed to, respectively, oxygen deficiency center (II) (ODC(II)) and E' center [19], hydrogen-related species and nonbridging oxygen hole centers (NBOHCs) [20]. The band at ~400nm could be also related to phosphate-relate oxygen hole centers (POHC) according to [21] and the main band at ~500nm could be related to the emission of Yb 2+ and to [AlO4] 0 centers [22]. The blue (410 nm) and red (660 nm) bands are, also, very typical of the emission of Ti 3+ species in Al2O3 [23] and titanium is a frequent impurity in materials with Al.…”

Section: Figures 3 Exhibit the Visible Emission Spectra Under 255nm Ementioning

confidence: 89%

Better understanding of the role of SiO2, P2O5 and Al2O3 on the spectroscopic properties of Yb3+ doped silica sol-gel glasses

Glorieux

Salminen

Massera

et al. 2018

Journal of Non-Crystalline Solids

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Yb 3+ doped silica sol-gel glass powders were prepared with different concentrations of SiO2, Al2O3 and P2O5 in order to understand the impact of the glass composition on the Yb 3+ emission properties. In this paper, we clearly show that not only the Al/P ratio but also the SiO2 content have an impact on the Yb 3+ spectroscopic properties. Our results provide new insight on the real impact of the composition on the spectroscopic properties of Yb 3+ doped sol-gels: we demonstrate that an increase in the Al2O3 content at the expense of P2O5 leads to an increase in the intensity of the emission at 1000nm of the Yb 3+ ions whereas an increase in the SiO2 content decreases it. We clearly showed that the inexpensive sol-gel approach can be easily used when investigating new Yb 3+ doped silica glasses.

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Investigations on the photoluminescence spectra and its defect-related nature for the ultraviolet transmitting fluoride-containing phosphate-based glasses

Cited by 24 publications

References 35 publications

UV-transmitting step-index fluorophosphate glass fiber fabricated by the crucible technique

UV-transmitting step-index fluorophosphate glass fiber fabricated by the crucible technique

Phellodendron chinense Schneid: A novel yellow-emitting luminescent material for white light-emitting diodes

Better understanding of the role of SiO2, P2O5 and Al2O3 on the spectroscopic properties of Yb3+ doped silica sol-gel glasses

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