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121.
H.S. Roh Y.C. Kang H.D. Park S.B. Park 《Applied Physics A: Materials Science & Processing》2003,76(2):241-245
Y2O3:Eu phosphor particles were prepared by large-scale spray pyrolysis. The morphological control of Y2O3:Eu particles in spray pyrolysis was attempted by adding polymeric precursors to the spray solution. The effect of composition
and amount of polymeric precursors on the morphology, crystallinity and photoluminescence characteristics of Y2O3:Eu particles was investigated. Particles prepared from a solution containing polyethylene glycol (PEG) with an average molecular
weight of 200 had a hollow structure, while those prepared from solutions containing adequate amounts of citric acid (CA)
and PEG had a spherical shape, filled morphology and clean surfaces after post-treatment at high temperature. Y2O3:Eu particles prepared from an aqueous solution with no polymeric precursors had a hollow structure and rough surfaces after
post-treatment. The phosphor particles prepared from solutions with inadequate amounts of CA and/or PEG also had hollow and/or
fragmented structures. The particles prepared from the solution containing 0.3 M CA and 0.3 M PEG had the highest photoluminescence
emission intensity, which was 56% higher than that of the particles prepared from aqueous solution without polymeric precursors.
Received: 22 March 2002 / Accepted: 26 March 2002 / Published online: 5 July 2002
RID="*"
ID="*"Corresponding author. Fax: +82-42/861-4245, E-mail: yckang@pado.krict.re.kr 相似文献
122.
W. Wurth 《Applied Physics A: Materials Science & Processing》1997,65(2):155-158
Accepted: 6 March 1997 相似文献
123.
Summary Screening effects due to the presence of an excited electron, acting as spectator during the decay process of autoionizing
and shake-up states, are analysed in the specific case of the Auger spectrum of LiF molecule. Decreasing of total decay probability
and enhancement of the energy of the emitted electrons results as the major effects that can be ascribed to electronic relaxation
processes. Our analysis confirms experimental observations made in photoemission experiments on semiconductors and previous
theoretical predictions. 相似文献
124.
V.D. Blank S.G. Buga N.R. Serebryanaya G.A. Dubitsky R.H. Bagramov M.Y. Popov V.M. Prokhorov S.A. Sulyanov 《Applied Physics A: Materials Science & Processing》1997,64(3):247-250
60 in the pressure range and the temperature range were studied. These properties are the specific gravity, specific heat in the range , sound velocities, elastic moduli, electrical properties, resistance to uniaxial stress and stability against oxidation.
These properties are different from those of diamond and other carbon forms. The hardness of ultrahard fullerites exceed the
hardness of diamond. The structures of the samples are described on the basis of X-ray data.
Received: 27 September 1996/Accepted: 19 December 1996 相似文献
125.
In this study some aspects of the chloride‐based CVD growth process have been investigated by using both the approach to add HCl to the standard precursors and by using the single molecule precursor methyltrichlorosilane (MTS). The efficiency of the process for different precursors, the growth rate stability and the effect that the C/Si and Cl/Si ratios have on the growth are studied. It is found that MTS is the most efficient precursor and that the growth becomes carbon limited at C/Si < 1. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
126.
CuGaSe2 (CGS) thin‐film solar cells were prepared with an in‐line co‐evaporation process and the established buffer combination CdS/i‐ZnO was replaced by ZnS/(Zn,Mg)O. We obtained functional CGS solar cells with a strong gain in the short‐circuit current density as compared to the CdS/i‐ZnO buffer reference cells. The enhanced current density is a result of improved transmission in the wavelength region between 330 nm and 550 nm of the ZnS/(Zn,Mg)O buffer combination as compared to CdS/i‐ZnO. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
127.