Impurities in synthetic fluorite for deep ultraviolet optical applications

Sils, J.; Hausfeld, S.; Clauß, W.; Pahl, U.; Lindner, R.; Reichling, Michael

doi:10.1063/1.3224879

Cited by 26 publications

(5 citation statements)

References 44 publications

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“…The emission peak at 420 nm in the irradiated samples is attributed to 4f 7 → 4f 6 5d 1 transitions of Eu 2+ ions [16]. The 552 nm emission observed in the pristine sample is attributed to the well studied 5D 0 → 7F 0 transition of Eu 3+ ions [17]. The PL intensity is found to be enhanced in the Eu doped nanocrystals when compared with the undoped CaF 2 nanocrystals studied by the present authors.…”

Section: Photoluminescence Spectrasupporting

confidence: 50%

Synthesis and optical studies of gamma irradiated Eu doped nanocrystalline CaF2

Pandurangappa¹,

Lakshminarasappa

Nagabhushana

2011

Journal of Alloys and Compounds

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Section: Photoluminescence Spectrasupporting

confidence: 50%

Synthesis and optical studies of gamma irradiated Eu doped nanocrystalline CaF2

Pandurangappa¹,

Lakshminarasappa

Nagabhushana

2011

Journal of Alloys and Compounds

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“…YAG-based materials are widely used as active media for lasers [2], phosphors for converting chip radiation in LEDs [3], scintillators for recording hard ultraviolet [4], X-ray radiation [5]. Luminescent materials based on YAG are used in the form of crystals, ceramics, powders, films.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Luminescence efficiency of cerium-doped yttrium aluminum garnet ceramics formed by radiation assisted synthesis

Alpyssova

Лисицын

Golkovski

et al. 2021

EEJET

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The variety of applications of yttrium-aluminum garnet (YAG)-based luminescent materials and the morphology necessary for these purposes required the development of many technologies for their synthesis. All synthesis technologies used are complex. The structural phase of yttrium-aluminum garnet is formed with any technology, at temperatures exceeding 1,500 °C. The starting materials for the synthesis are metal oxides of aluminum, yttrium and other oxides for activation and modification. It seems possible to use hard radiation to form a new phase. Radiation synthesis of ceramics is realized in less than 1 s, without the use of any additives and influences. The synthesis was carried out at the electron accelerator of the Institute of Nuclear Physics (Novosibirsk). In this work, we studied the spectral-kinetic and quantitative characteristics of luminescence for the first time obtained by the method of radiation synthesis of ceramic samples of yttrium-aluminum garnet doped with cerium with statistical processing of their values. The dependences of the reproducibility of the spectral characteristics of the luminescence of the samples on the preliminary preparation of the charge for synthesis have been investigated. Several cycles of luminophore brightness studies have been performed. It is shown that the obtained ceramics based on yttrium-aluminum garnet doped with cerium possesses the required spectral-kinetic properties, and the efficiency of conversion of the chip radiation into luminescence is achieved, which is comparable to that available in commercial phosphors. The maximum measured values of the position of the bands are from 553.5 to 559.6 nm. Brightness values range from 4,720 to 1,960 cd/m2. It was found that the main reason for the scatter in the characteristics of the luminescent properties of ceramics of yttrium-aluminum garnet, activated by cerium obtained by radiation assisted synthesis is the high rate of synthesis and, especially, the high rate of cooling of the samples.

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“…Ancak faz oluşumuna ait bir endoterm gözlenmemektedir. [8][9][10][11][12][13]. La1.90Eu0.10Ru2O7, baskın olan kırmızı bölge ışıması sebebi ile opto-elektronik uygulamalar için aday olabilir.…”

Section: Bulgularunclassified

La1.90Eu0.10Ru2O7 Sisteminin Sentezi ve Fotoluminesans Özelliklerinin İncelenmesi

Öztürk¹

2016

SDÜ Fen Bil Enst Der

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Özet: A2B2O7 tipindeki La1.90Eu0.10Ru2O7 sistemi yüksek sıcaklık katı hal yöntemlerinden seramik metot ile sentezlendi. Malzemenin sentez sıcaklığının belirlenmesi ve termal davranışlarının incelenmesi amacıyla termogravimetridiferansiyel termal analiz (TG/DTA) sistemi kullanıldı ve belirlenen sıcaklıklarda kül/tüp fırınında reaksiyon gerçekleştirildi. Malzemenin kristal yapısı x-ışınları toz kırınım difraktometresiyle (XRD) kontrol edildi, yüzey morfolojisi ve elementel analizi taramalı elektron mikroskop (SEM) ile yapıldı. Fotoluminesans özellikler olan ışıma ve uyarma dalga boyu ile ışıma süresi fotoluminesans spektrofotometre (PL) ile belirlendi. Abstract: A2B2O7 type La1.90Eu0.10Ru2O7 system was synthesized via ceramic method which is one of the high temperature solid-state reaction methods. To determine the materials sintering temperatures and investigate thermal properties, thermogravimetric and differential thermal analysis (TG/DTA) system were used and the reaction was done in furnace/tube furnace. The crystal structure of material was checked by x-rays powder diffractometer (XRD) and the surface morphology and elemental analysis were carried out with a scanningelectron microscope (SEM). Photoluminescence properties, the decay time, excitation and emission wavelengths were defined with photoluminescence spectrophotometer (PL). Sythesis and Investigation GirişFotoluminesans özellik, UV ve görünür bölgede uyarılan bir maddenin soğurduğu enerjiyi uyarma etkisi ortadan kaktıktan sonra bile yayabilmesi yani ışıma yapabilmesidir. Bu tür maddelere "ışıldar" veya "fosfor" denilir. Uyarılmış halden temel hale doğrudan geçiş olarak tanımlanan ve uyarma süresince devam eden ışımaya "floresans", uyarıcı etki ortadan kalktıktan sonra da ışımanın devam etmesi olayına "fosforesans" adı verilmektedir. Gecikme süresine göre, τc < 10 -8 s ise ışıma floresans ve τc > 10 -8 s ise fosforesans olarak tanımlanır. Fosforesans ise kısa (τc < 10 -4 s) ve uzun ( τc > 10 -4 s) süreli olmak üzere kendi arasında ikiye ayrılır. Bazen de ışıma sürelerine göre (τ ) göre, çok kısa süreli (τ < 10 -3 s ), kısa süreli (τ ≈ s), uzun süreli (τ ≈ dakika ), çok uzun süreli (τ ≈ saat ) ışıldarlar ve süper ışıldarlar (τ > 10 saat) olarak sınıflandırılırlar. Fotoluminesans olgusu floresans ve fosforesans terimlerini kapsar. Fotoluminesans özelliğin gözlendiği anorganik kristal yapıdaki ışıldar maddeler genelde oksit, oksisülfür, sülfür, selenür, borat, fosfat, gallat, germanat, vanadat, sülfat, molibdat, aluminat, silikat ve aluminasilikat türü bileşiklerdir [1][2][3][4][5].Doğal olarak fotoluminesans özelliğe sahip maddeler olduğu gibi, istenen amaca yönelik malzemeler de geliştirilebilir. Bunun için bir kristale (konut kristal), safsızlık atomları katkılanabilir, bu atomlar "aktivatör" atomlar olarak adlandırılırlar. Bu aktivatör atomlar dar bir enerji bandı oluşturmaları için çok az miktarlarda ( % 1-10 mol) katkılanırlar. Katkılandıkları kristalde ışıma ve kusur merkezleri oluşturmasından dolayı luminesans özellikler bakımından bir takım fark...

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Impurities in synthetic fluorite for deep ultraviolet optical applications

Cited by 26 publications

References 44 publications

Synthesis and optical studies of gamma irradiated Eu doped nanocrystalline CaF2

Synthesis and optical studies of gamma irradiated Eu doped nanocrystalline CaF2

Luminescence efficiency of cerium-doped yttrium aluminum garnet ceramics formed by radiation assisted synthesis

La<sub>1.90</sub>Eu<sub>0.10</sub>Ru<sub>2</sub>O<sub>7</sub> Sisteminin Sentezi ve Fotoluminesans Özelliklerinin İncelenmesi

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