Synthesis and Luminescent Property of Nanocrystalline Phosphors via Solvothermal Processes
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0988-QQ06-25
Synthesis and Luminescent Property of Nanocrystalline Phosphors via Solvothermal Processes Chien-Yuen Tung1, Shyue-Ming Chang1, and Teng-Ming Chen2 1 Material and Chemical Research Laboratories, Industrial Technology Research Institute, Rm.109A,Bldg.23,321 Kuang Fu Road Sec.2, Hsinchu, 30011, Taiwan 2 Phosphors Research Laboratory, Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Ta Hsueh Road, Hsinchu, 1001, Taiwan ABSTRACT We have synthesized a series of nanocrysatlline (5±3 nm in diameter) and submicrom ZnS:Ag,Al phosphors with various dopant compositions via a newly developed emulsion method. The X-ray diffraction (XRD), EDS, SEM, and TEM were utilized in the characterization of phase purity and microstructure of phosphor particles. Photoluminescence (PL) and cathodoluminescence (CL) spectra were also utilized to characterize the optical properties of blue-emitting phosphor. The CL intensity of submicron ZnS:Ag,Al phosphor was found to be weaker than that of corresponding commercial product, which was attributed to the poor crystallinity and small grain size. In this article we described the synthesis of ZnS:Ag,Al nanophosphor with emphasis on the correlation between spectroscopic features and the microstructure. INTRODUCTION In general, the properties (electrical, optical, chemical, mechanical, magnetic, etc.) of nanoparticles can be selectively controlled by engineering the size, morphology, and composition of the particles. After developing materials in this near-atomic size range, engineers can combine and exploit the properties of the surface atoms of nanoparticles to create new substances with enhanced or entirely different properties from their parent materials. There is a drive to manufacture flat compact displays by a variety of technologies and most of these will benefit from using new types of phosphors based on nanoparticulate materials. Traditional phosphors are based on relatively large (several microns) particles that have been made using traditional ceramic methods that leave a damaged “dead layer” on the surface due to the grinding and ball milling processing that is involved. The situation can be improved by making perfect uniform micro- or nano-crystals that have no surface damage layers or internal defects by using chemical colloidal [1], sol-gel [2], polyol-mediated route [3] and precipitation/microemulsion [4] methods, respectively. For instance, Dinsmore et al described the synthesis using a surfactant-water mixture as a template to control particle size (3.5 nm to 8.4 nm in size) of ZnS:Mn nanophosphors whose structure and light emitting properties were investigated in detail [4]. Huang et al [5] reported the synthesis and characterization of Y2O3:Eu nanoparticles with 10-100 nm in size using a microemulsion system composed of petroleum ether (60-80 ), nonionic surfactants NP-5/NP-9, aqueous yttrium nitrate/europium nitrate and ammonium hydroxide solution. Submicron or nanoparticulate phosphors have been proposed to exhibit maximized screen resolutio
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