Optimization of red phosphor for plasma display panel by the combinatorial chemistry method
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Chang Hae Kim and Joon Taik Park Department of Chemistry, Korea Advanced Institute of Science and Technology, 305-701 Taejon, Korea
Hee Dong Park Display Phosphor Group, Korea Research Institute of Chemical Technology, 305-600 Taejon, Korea (Received 11 April 2002; accepted 26 September 2002)
Combinatorial chemistry was applied to the optimization of red phosphors used for plasma display panels. Quaternary and ternary combinatorial libraries were developed for (Y,Gd,Lu,Sc)BO3 and (Y,Gd)(BO3 ⭈ PO4) systems. Our combinatorial chemistry system consists of solution-based combinatorial synthesis and characterization, enabling the swift scanning of luminance and of Commission Internationale de l’Eclairage (CIE) chromaticity under vacuum ultraviolet light excitation. As a consequence of the combinatorial approach, several new candidates were found to show higher luminance than the commercially available red phosphor for plasma display panels. I. INTRODUCTION
Newly developed flat panel displays claim more promising phosphors, the qualification of which should be different from the conventional phosphors used for cathode-ray tubes (CRT) or fluorescent lamps. Recently developed plasma display panels (PDP) require new phosphors of high luminance at vacuum ultraviolet (VUV) excitation. The main purpose of the present investigation is to develop a searching system for PDP phosphors using a combinatorial chemistry method. For this sake, we applied the Eu3+-activated borates and borophosphates system to our combinatorial searching system. In fact, yttrium gadolinium borate has been used as a commercially available red phosphor for PDP but still needs some improvement in performance.1 This compound was developed long ago and the luminescent property has been studied extensively. However, there has been little consideration with regard to the luminescent property of compound mixed with some other elements, such as Sc, Lu, and P. In this regard, the present approach could improve the currently used yttrium gadolinium borate red phosphor. Combinatorial chemistry has been widely applied to the synthesis of a variety of materials such as drugs or various inorganic functional materials.2–4 With regard to the inorganic materials, most investigations, which dealt
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Address all correspondence to this author. e-mail: [email protected] J. Mater. Res., Vol. 17, No. 12, Dec 2002
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with the combinatorial chemistry, are focused on the solid-state combinatorial chemistry based on thin film3–7 or on the solution printing technology.8 The solutionbased combinatorial chemistry is applied to the synthesis of phosphor powders in the present investigation. A large number of methods have been developed in the pharmaceutical field to generate solution-based libraries. However, in solution-based combinatorial chemistry, reagents are typically delivered individually to each sample site, and so the creation of these libraries is relatively inefficient with respect to process speed and accuracy.
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