Luminescent properties of BaMgAl 10 O 17 :Eu 2+ phosphor layer prepared with phosphate ester
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Seon-Mi Yoon, Eunsung Lee, and Jae-Young Choib) Display Device & Processing Laboratory, Samsung Advanced Institute of Technology, Suwon 440-600, Republic of Korea (Received 13 February 2007; accepted 26 March 2007)
The preparation of BaMgAl10O17:Eu2+ (BAM) blue phosphor layer for a plasma display panel by the addition of a newly designed energetic dispersant (hereafter referred to as SAIT7) and its resulting photoluminescence (PL) efficiency is investigated. The addition of SAIT7 increases the maximum solids loading of BAM phosphor paste from 27.91 to 35.87 vol% and yields a highly packed microstructure of the phosphor layer. The PL intensity is increased by 7.57% compared to the BAM blue phosphor layer prepared without SAIT7. In conclusion, the addition of SAIT7 increased the packing density of the phosphor layer and resulted in improved luminescent properties of the phosphor layer.
I. INTRODUCTION
A plasma display panel (PDP) is a representative large flat-panel display having the advantages of good image quality, rapid response, and wide-angle view. However, it has a critical problem of a relatively low luminescent efficiency, which needs to be addressed. The phosphor particle acts as an energy converter that converts vacuum ultraviolet (VUV) radiation to visible light. The energyconversion efficiency of photoluminescence (PL) changes with the combination of the host crystal and activator ion. Therefore, the low efficiency of the PDP originates from the phosphor. BaMgAl 10 O 17 :Eu 2+ (BAM) is a typical blue-emitting phosphor that is of particular interest for use in PDPs. However, it has a relatively lower luminescent efficiency (2.2 lm/W) than the that of red- and green-emitting phosphors (5.7 and 12.0 lm/W, respectively).1 To enhance its efficiency, much attention has been given to the development of phosphor materials.2–7 Researchers have focused on the influence of the physicochemical properties of phosphor including activator concentration, crystallinity, morphology, particle size, and particle size distribution on the luminescent efficiency of phosphor. It has been reported2 that a PL intensity similar to that of commercial powder was obtained by controlling the crystallinity of the BAM phosphor. The highest emission intensity of phosphor Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/JMR.2007.0426 J. Mater. Res., Vol. 22, No. 12, Dec 2007
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was approximately 14.89% higher than the commercial phosphor prepared by a conventional solid-state route, by substituting a different atom for the Mg sites.4 Albessard et al.8 demonstrated that a phosphor layer prepared with conventional BAM phosphor has a loosely packed structure because a conventional BAM phosphor has a platelike shape and large particle size, which results in the low luminescent efficiency of phosphor. They also suggested that spherical small-sized particles could provide an improvement in the optical performan
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