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  • 1
    Electronic Resource
    Electronic Resource
    Concentration Dependent Fluorescence Lifetime in Nanocrystalline Y〈sub〉2〈/sub〉O〈sub〉3〈/sub〉:Eu Phosphors (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 128 (Oct. 2007), p. 165-171 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Nanocrystalline (Y1-xEux)2O3 powder was synthesized via a chemical vapour reaction. Xraydiffraction revealed the structure of cubic yttria with crystallite sizes of about 5 nm. The Eudopandconcentrations x for the samples in the range from 0.003 up to 0.165 were determined byEDX-spectra. The luminescence of the nanopowders was investigated by continuous and timeresolvedUV-fluorescence spectroscopy and compared to a microcrystalline Y2O3:Eu phosphor as areference. The emission spectra show an increasing intensity for higher doping concentrations.However, compared to the microcrystalline material the yield was significantly lower. The lifetimeof the 5D0 – 7FJ transition in the nanocrystalline Y2O3:Eu was found to be significantly longer thanfor the microcrystalline reference sample. For increasing Eu-content the lifetime in thenanocrystalline samples decreased continuously from 3.71 ms to a value of 1.20 ms for the highestdoping concentration. The concentration dependent lifetime behaviour was interpreted by energytransfer between Eu ions and from Eu ions to impurities as a competing process to the radiative 5D0– 7F2 transition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.128.165.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Optical Properties of Nanocrystalline YAG:Ce (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 140 (Oct. 2008), p. 9-16 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Due to its high quantum efficiency (QE) for luminescence, conventional coarse-grainedYAG:Ce (Y3Al5O12:Ce) finds widespread use in light conversion and scintillator applications.Nanocrystalline YAG:Ce may possess modified optical properties which are advantageous fortechnological applications, but this will depend on highly efficient energy conversion. In this work,the effect of the particle size and Ce concentration on the quantum efficiency and the opticallifetime of the YAG:Ce emission will be characterized and discussed. Nanocrystalline YAG:Cewith an average particle size of 20 to 50 nm was synthesized by the chemical vapour reaction(CVR) method and subsequently analyzed using various techniques. When comparing thenanocrystalline samples to a coarse-grained reference sample, the particle size and dopingconcentration was found to have a significant influence on quantum efficiency. It was establishedthat the nanocrystalline samples investigated exhibit a lower QE at ambient temperature than thecoarse-grained reference. The results of the optical lifetime measurements are discussed in relationto this reduction in QE
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.140.9.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Vapour Phase Synthesis of Nanocrystalline In Situ YAG:Ce (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 128 (Oct. 2007), p. 7-12 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Nano-crystalline YAG:Ce (Y3Al5O12:Ce) with an average particle size of 10-50 nm wassynthesized by the vapour phase reaction (CVR) in a hot-wall reactor. This nano-crystallineluminescent material has the advantage of a high light-conversion efficiency associated withsuperior light-scattering properties. Phases and compositions were analyzed by XRD and EDX,respectively. Photoluminescence was used to investigate the optical properties of the YAG hostlattice doped with Cerium. As a first step the conditions for the in-situ production of the YAGphase were established. On the basis of previous DSC investigations of YAG phase formation, theDSC results were analyzed according to the Kissinger theory for thermally activatedtransformations. From the results it is predicted that, with sufficient heat transfer during theresidence time of the particles in the hot zone of the reactor, YAG can be obtained in-situ during theCVR process. By modifying the parameters and the CVR setup it was possible to achieveconditions, which allow the production of in-situ YAG. Samples with Ce doping concentrationsranging from 0 to 2.65 at.% Ce were prepared to investigate the influence of the dopingconcentration on the luminescence of YAG:Ce
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.128.7.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Physics of Nanocrystalline Luminescent Ceramics (2003)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 94 (June 2003), p. 85-94 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/26/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.94.85.pdf
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    Paper (German National Licenses)
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