Low temperature synthesis of nanocrystalline Y3Al5O12 (YAG) and Ce-doped Y3Al5O12 via different sol–gel methods

Veith, Michael; Mathur, Sanjay; Kareiva, Aivaras; Jilavi, Mohammad H.; Zimmer, Michael; Hüch, Volker

doi:10.1039/a903664d

Cited by 281 publications

(163 citation statements)

References 36 publications

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“…Intermittence in emission (blinking), which is a problem in certain applications of single quantum dots, is not expected for inorganic phosphor nanocrystals as they contain a large number of luminescing ions (typically between 10 and 10 000 depending on the size of the nanocrystal and the concentration of luminescing ions). In the past few years there has been a growing interest in the properties of nanocrystalline lanthanide-doped insulating phosphors, and several well-known materials, such as Y 2 [15][16][17][18][19] ), have been prepared in nanocrystalline form. The application of lanthanide-doped nanocrystalline phosphors as biological labels would however strongly limit the photon turnover rates due to the long (ms to ms) decay time of their intraconfigurational 4f n luminescence.…”

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confidence: 99%

Efficient energy transfer between nanocrystalline YAG:Ce and TRITC

Wuister

Donegá

Meijerink

2004

Phys. Chem. Chem. Phys.

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Luminescent nanocrystalline (NC) Ce 3+-doped yttrium aluminum garnet (Y 3 Al 5 O 12 :Ce-YAG:Ce) is prepared by a combustion synthesis technique that yields a highly porous three-dimensional network of interconnected 18 nm nanocrystals. Tetramethyl rhodamine isothiocyanate (TRITC) was conjugated to NC YAG:Ce by using glycine as a bridging molecule. Efficient energy transfer is observed from the Ce 3+ ions to the TRITC molecules upon photoexcitation of the NC YAG: Ce-TRITC conjugates.Resonant energy transfer (ET) between a donor in the excited state and a neighboring acceptor is commonly observed between dyes, 1 quantum dots and dyes, 2,3 quantum dots, 4,5 and metal ions. 6 The ET process can occur via several mechanisms, but the electric dipole-electric dipole interaction is the most effective one over relatively long distances (up to several tens of angstroms, with a r À6 distance dependence). 6 This mechanism is particularly efficient when both donor and acceptor have allowed electric dipole resonant transitions.ET between suitable probes can be used to obtain structural information or monitor dynamic processes in biological systems but its usefulness is severely limited by fast photobleaching when dyes are used for tagging the target molecules. Semiconductor quantum dots are more stable than dyes 7 but still suffer from photoinduced degradation processes. Luminescent ions in inorganic phosphors offer the prospect of a greatly superior photo-stability associated with high quantum yields. Intermittence in emission (blinking), which is a problem in certain applications of single quantum dots, is not expected for inorganic phosphor nanocrystals as they contain a large number of luminescing ions (typically between 10 and 10 000 depending on the size of the nanocrystal and the concentration of luminescing ions). In the past few years there has been a growing interest in the properties of nanocrystalline lantha- , have been prepared in nanocrystalline form. The application of lanthanide-doped nanocrystalline phosphors as biological labels would however strongly limit the photon turnover rates due to the long (ms to ms) decay time of their intraconfigurational 4f n luminescence. One of the few exceptions for visible-emitting phosphors is Y 3 Al 5 O 12 :Ce (YAG:Ce). In YAG:Ce the 5d state of Ce 3þ is situated at a low energy resulting in a fast intraconfigurational 5d ! 4f luminescence in the visible. The luminescence life time of this emission is 65 ns. 20This luminescence decay time is ideally suited for time-gated detection of biological species, since it is slower than the autofluorescence background decay common to many biological species (typically a few ns), but is still fast enough to ensure a high turnover rate. Additional attractive features are the excitation in the blue (which further decreases the autofluorescence background obtained under UV excitation) and the large Stokes shift of the luminescence. The strong electric dipole of the Ce 3þ f-d emission also makes NC YAG:Ce a promising candidate as donor f...

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confidence: 99%

Efficient energy transfer between nanocrystalline YAG:Ce and TRITC

Wuister

Donegá

Meijerink

2004

Phys. Chem. Chem. Phys.

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“…It is recognized that wet chemical processing of multi-cation oxides provides the considerable advantage of good mixing of the starting materials and excellent chemical homogeneity of the final product [13,14]. YAG nano powders with homogeneously distributed lanthanide element within the garnet matrix have been successfully synthesized by an aqueous sol-gel process and acetate-nitrate-glycolate route [15,16]. It has been well demonstrated that the sol-gel method has considerable advantages of good mixing of the starting materials and good chemical homogeneity of the product.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Nd:Y₃Al₅O₁₂ nanocrystals by low temperature glycol route

Kaithwas

Dave

Kar

et al. 2010

Cryst. Res. Technol.

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Y 3 Al 5 O 12 , yttrium aluminum garnet (YAG) single crystals are extensively used as host materials for solidstate lasers. The materials in nano sizes are of immense importance due to their fascinating physical and chemical properties. Nanocrystals of Nd doped YAG were synthesized by low temperature glycol route. This method consists of a mixing of nitrates in an aqueous media at reasonably low temperatures. The Nd doping concentration was optimized and kept at 2 mol%. The prepared material was annealed at different temperatures. Single phase Nd:YAG nanocrystals were obtained at 850 °C. The prepared nanocrystals were characterized by XRD, SEM and TEM techniques for the crystalline phase, crystalline size and structure. The crystalline sizes were obtained in the range of ~20-30 nm.

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“…A white LED with a CRI = 93 was obtained by using a powder mixture between a YAG:Ce and red−emit− ting CaSiAlN 3 :Eu 2+ . Optical properties of white LEDs ba− sed on YAG:Ce or YAG:Ce,Re phosphors are presented in Table 5 [4,6,13,14,22,30,41,58,[74][75][76].…”

Section: Fluorescence (Pl) Spectroscopymentioning

confidence: 99%

Synthesis and characterization of YAG:Ce phosphors for white LEDs

Ţucureanu

Matei

Avram

2015

Opto-Electronics Review

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Worldwide commercial interest in the production of cerium doped yttrium aluminium garnet (YAG:Ce) phosphors is reflected in the widespread use of white light emitting devices. Despite of the fact that YAG:Ce is considered a “cool phosphor” it is the most important in white LED technology. This article reviews the developed techniques for producing phosphors with superior photoluminescence efficiency, including solid-state reaction, sol-gel and (co)precipitation methods. Also, by co-doping with rare earth elements, a red/blue shift is reached in the spectrum. The characteristics of YAG:Ce phosphors are investigated because the properties of the phosphors are strongly influenced by the synthesis routes and the sintering temperature treatment. After the phase analysis, morphology and emission studies of the phosphors there may be seen the conditions when the transition from the amorphous phase to the crystalline phase appears, when luminescent properties are influenced by the crystalline form, purity, average size of the particles, co-doping and so on.

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Low temperature synthesis of nanocrystalline Y3Al5O12 (YAG) and Ce-doped Y3Al5O12 via different sol–gel methods

Cited by 281 publications

References 36 publications

Efficient energy transfer between nanocrystalline YAG:Ce and TRITC

Efficient energy transfer between nanocrystalline YAG:Ce and TRITC

Preparation of Nd:Y₃Al₅O₁₂ nanocrystals by low temperature glycol route

Synthesis and characterization of YAG:Ce phosphors for white LEDs

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Low temperature synthesis of nanocrystalline Y3Al5O12 (YAG) and Ce-doped Y3Al5O12 via different sol–gel methods

Cited by 281 publications

References 36 publications

Efficient energy transfer between nanocrystalline YAG:Ce and TRITC

Efficient energy transfer between nanocrystalline YAG:Ce and TRITC

Preparation of Nd:Y3Al5O12 nanocrystals by low temperature glycol route

Synthesis and characterization of YAG:Ce phosphors for white LEDs

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Preparation of Nd:Y₃Al₅O₁₂ nanocrystals by low temperature glycol route