Luminescence properties of Y3Al5O12:Ce nanoceramics

Zorenko, Yu.; Voznyak, T.; Gorbenko, V.; Zych, Eugeniusz; Nizankovski, S.; Dan’ko, A. Ya.; Puzikov, V. M.

doi:10.1016/j.jlumin.2010.08.015

Cited by 47 publications

(14 citation statements)

References 24 publications

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“…The blue‐UV emission obtained in our study should be distinguished from the intrinsic defect‐related luminescence known in YAG. The emission band of antisite defects and F + centers are peaking at 302 nm (4.1 eV) and 390 nm (3.15 eV) respectively , while the blue‐UV emission in Fig. covers spectral range from 360 nm (3.4 eV) to 460 nm (2.7 eV).…”

Section: Resultsmentioning

confidence: 99%

“…It was reported that YAG:Ce nanopowders have been successfully synthesized by means of many techniques, which include co‐precipitation method , hydrothermal process , Pechini method , sol–gel method . Resent researches of YAG:Ce are mostly focused on the synthesis, characterization and applications of YAG:Ce in form of nanopowders , nanoceramics and single crystalline films .…”

Section: Introductionmentioning

confidence: 99%

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Emerging blue‐UV luminescence in cerium doped YAG nanocrystals

Shirmane

Pankratov

2016

Physica Rapid Research Ltrs

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Time-resolved luminescence properties in of Ce 3+ doped Y 3 Al 5 O 12 (YAG) nanocrystals have been studied by means of vacuum-ultraviolet excitation spectroscopy. It was discovered that additionally to the regular Ce 3+ yellow-green emission which is well-known luminescence in YAG, new emission covering broad spectral range from 2.7 eV to 3.5 eV was revealed in the luminescence spectra for all YAG:Ce nanocrystals studied. This blue-UV emission has fast decay time about 7 ns as well as intensive well-resolved excitation band peaking at 5.9 eV and, in contrast to green Ce 3+ emission, practically is not excited at higher energies. The origin of the blue-UV emission is tentatively suggested and discussed.Copyright line will be provided by the publisher Bulk cerium doped Y 3 Al 5 O 12 (YAG:Ce) is an important and well-known luminescent material that had been studied more than 40 years. This compound became as one of the most popular materials among others because of its high radiation and chemical stability as well as efficient yellow-green luminescence [1, 2 and references therein]. Luminescent nanocrystals or nanophosphors (including YAG:Ce) recently received increased attention because of their potential application in medicine and biophysics (labeling, signaling, and biomedical purpose) [3]. Generally, nanophosphors of various inorganic compounds in form of nanopowders and nanoceramics have been successfully synthesized during the last decade all over the world thanks to rapidly developed nanotechnologies. It was reported that YAG:Ce nanopowders have been successfully synthesized by means of many technique, which include co-precipitation method [4], hydrothermal process [5], Pechini method [6], sol-gel method [7]. Resent researches of YAG:Ce are mostly focused on the synthesis, characterization and applications of YAG:Ce in form of nanopowders [8,9], nanoceramics [10-13] and single crystalline films [14,15].The main goal of the current investigation is a study of the luminescence properties of nanosized YAG:Ce under high energy excitations including vacuum ultraviolet (VUV) range, which is important for biolabelling, radiation therapy applications and scintillators. In our study we applied synchrotron radiation, which has significant advantages over the radiation of ordinary sources. The main advantages of synchrotron radiation is the extended wavelength range attained, that gives broad and continuous spectrum. In recent works it was shown how important is to use synchrotron radiation in investigation of optical and luminescence properties of wide band gap insulators [9,[16][17][18][19][20] as well as of nanocrystalline and two-dimensional semiconductors [21,22].The luminescence measurements was carried out using pulsed synchrotron radiation at the Superlumi station at Photon Science (DESY, Hamburg) [23]. Luminescence spectra in the UV and visible range were recorded with a spectrograph SpectraPro-308i (Acton Research Corporation) equipped with a photomultiplier (Hamamatsu R6358P). The spectral resolution of the...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Emerging blue‐UV luminescence in cerium doped YAG nanocrystals

Shirmane

Pankratov

2016

Physica Rapid Research Ltrs

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“…No obvious difference of the spectra features between the powder sample and the composite sample was found. At very low temperature, a spectrometer with fine resolution may directly distinguish two peaks at about 536 nm and 567 nm, respectively, in the emission spectrum of YAG:Ce [11]. Both emission bands are electron transitions from the lowest 5d level to 4f multiplets ( The two wide fluorescence emission bands of YAG:Ce overlap to such an extent that stress-dependent changes are almost indistinguishable, as is evident in Fig.…”

Section: Resultsmentioning

confidence: 93%

Stress- and Temperature-Dependent Wideband Fluorescence of a Phosphor Composite for Sensing Applications

Zhang

Baxter

et al. 2016

Exp Mech

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As both stress and temperature can alter the lattice of a solid phosphor in a similar way, the dopant rare-earth ion may be used as a probe for either parameter using the same sensing mechanism. Here, a wideband phosphor, YAG:Ce is used as a micro stress sensor at very low magnitudes of compressive stress. The sensing resolution can be smaller than 0.06 N/mm 2 in the range of 0~1.2 N/mm 2 with a sensitivity of 11 cm −1 /MPa. The sensitivity is about a hundred times larger than the coefficient reported under hydrostatic pressure. The barycenter energy of the emission band of a phosphor can be used to indicate stress and/or temperature change, producing a precision beyond the spectroscopic resolution limit. The sensing functions obtained from the barycenter shift are superior to those from peak shifts. The stress/temperature dependent barycenter shift of the observed fluorescence bands of YAG:Ce were similar in magnitude. Mechanisms involving the nephelauxetic effect, crystal field effect and site symmetry of dopant ions are explored as explanations of the experimental phenomena.

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“…The emission band of Ce 3+ is usually broad, which covers the wavelength region from ultraviolet to visible light, making it possible to sensitize other ions [12][13][14]. In recent years, more and more researchers found that it is quite easy to transfer energy between Ce 3+ and other rare earth trivalent ions (Re 3+ ) [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%