scholarly journals LUMINESCENCE OF YAG:Ce DOPED WITH SILVER NANOPARTICLES

Author(s):  
Александр Александрович Кравцов ◽  
Ирина Сергеевна Чикулина ◽  
Дмитрий Сергеевич Вакалов ◽  
Олег Михайлович Чапура ◽  
Святослав Олегович Крандиевский ◽  
...  

В работе впервые было исследовано влияние наночастиц серебра на люминесценцию иттрий-алюминиевого граната, легированного церием. С помощью метода химического восстановления был синтезирован золь с размером наночастиц серебра ≈100 нм. Керамический порошок люминофора иттрий-алюминиевого граната, легированного церием, был получен методом двухстадийного осаждения в уротропин. Золь наночастиц серебра в концентрациях от 0,125 до 0,1 мл вводили в порошок-прекурсор перед прокаливанием. Было показано, что при данном способе введения наночастиц серебра интенсивность фотолюминесценции возрастала по сравнению с эталоном. Оптимальной концентрацией в рамках исследования являлась концентрация 0,25 мл. При данной концентрации увеличение интенсивности фотолюминесценции на длине волны 540 нм составило порядка 10%. Проведенные исследования показали, что наночастицы серебра могут с успехом применяться для увеличения яркости люминофора иттрий-алюминиевого граната, легированного церием, без искажения и ухудшения спектральных характеристик. This work was the first to study the effect of silver nanoparticles on the luminescence of cerium doped yttrium-aluminum garnet. A sol with the size of silver nanoparticles of ≈100 nm was synthesized using the method of chemical reduction. Phosphor ceramic powder of the yttrium-aluminum garnet doped with cerium was obtained by the two-stage precipitation method. The silver nanoparticles sol was introduced into the precursor powder before calcination in concentrations from 0,125 to 0,1 ml. It was shown that the photoluminescence intensity increased in comparison with the reference when we used this method of introducing silver nanoparticles. The optimal concentration within the study was 0,25 ml. At this concentration, the increase in the photoluminescence intensity at a wavelength of 540 nm was about 10 %. Studies have shown that silver nanoparticles can be successfully used to increase the brightness of the phosphor of the yttrium-aluminum garnet doped with cerium without distortion and deterioration of spectral characteristics.

1982 ◽  
Vol 12 (6) ◽  
pp. 731-736 ◽  
Author(s):  
Khachik S Bagdasarov ◽  
I S Volodina ◽  
A I Kolomiĭtsev ◽  
M L Meĭl'man ◽  
A G Smagin

2008 ◽  
Vol 368-372 ◽  
pp. 420-422 ◽  
Author(s):  
Zhi Hui Chen ◽  
Jiang Tao Li ◽  
Jiu Jun Xu

Yttrium aluminum garnet (YAG) nanopowders were synthesized by n-amyl co-precipitation method. Transparent YAG ceramics were achieved by sintering the green body at 1800°C and then 1600°C for ten hours with TEOS as sintering additive. The transmittance of the sample was 75% at visible wavelength of 800nm.


Author(s):  
Gulnur Alpyssova ◽  
Victor Lisitsyn ◽  
Mikhail Golkovski ◽  
Dossymkhan Mussakhanov ◽  
Zhakyp Karipbayev ◽  
...  

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.


2021 ◽  
Vol 2094 (2) ◽  
pp. 022021
Author(s):  
A A Kravtsov ◽  
I S Chikulina ◽  
S N Kichuk ◽  
V A Tarala ◽  
M S Nikova ◽  
...  

Abstract In this study, silver nanoparticles with an average diameter of 50-70 nm were synthesized by the chemical reduction method. Subsequently, nanoparticles in different concentrations were introduced into the YAG: Ce luminescent powder synthesized by the method of two-stage coprecipitation into hexamine. The luminescence of samples with different contents of nanosilver was investigated. It was shown that the direct addition of nanosilver to YAG: Ce significantly impairs luminescence. Upon calcination at 900 °C, an increase in the luminescence of the YAG: Ce samples with silver nanoparticles was observed; however, the luminescence intensity was lower than that of the reference sample (without nanosilver). After calcination in an inert atmosphere at a temperature of 1550 °C, a significant increase in the luminescence intensity (of the order of 30-40 %) of the samples with the addition of a nanosilver was observed in comparison with the reference sample. Thus, silver nanoparticles can be successfully used to improve the YAG: Ce phosphors.


2013 ◽  
Vol 377 ◽  
pp. 151-155
Author(s):  
Xiao Juan Xu ◽  
Xu Dong Sun ◽  
Ji Guang Li ◽  
Xiao Dong Li ◽  
Di Huo ◽  
...  

Ultrafine spherical yttrium aluminum garnet (YAG) powders have been synthesized via homogeneous precipitation method using urea as the precipitant. The precursor powders were calcinated at 1000°C or 1100°C for 4 hrs and then were studied by means of FE-SEM, XRD, FT-IR and TG-DTA. The result shows that the amount of ammonium sulfate has a significant effect on morphology and particle size of powders. Pure phase and spherical YAG particles with 350 nm in diameter can be obtained when the molar ratio of ammonium sulfate to aluminum nitrate is about 0.75 and the concentration of the metallic ions is 0.008M.


2011 ◽  
Vol 284-286 ◽  
pp. 2259-2262
Author(s):  
Yin Sheng Zhao ◽  
Hai Long Yang ◽  
Jing Wang ◽  
Jia Song Zhong ◽  
Wei Dong Xiang ◽  
...  

Mn3+ ions doped in YAG:Ce phosphors as a co-activator and host lattice element by co-precipitation method, which have enlarged the emission spectral of pure YAG:Ce phosphor in the emission spectral, caused by 5T2-5E and 5T2-1T2 transition. Respectively, the manganese co-doped yttrium aluminum garnet doped cerium blended with YAG:Ce phosphor would show an improved white light emission.


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