| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fluorescent substance for a plasma display panel capable of remarkably raising the luminous intensity and color purity and improving the emission efficiency in a red region by providing the fluorescent substance with a specific chemical composition. SOLUTION: This fluorescent substance for a plasma display panel is preferably represented by the formula [0<(a)<=0.90; 0.01<=(b)<=0.20], e.g. (Y0.53 Gd0.40 Eu0.07 )2 O3 . The value of (a) is preferably within the range of 0.4<=(a)<=0.6. The fluorescent substance is obtained by weighing prescribed amounts of a compound capable of readily producing Y2 O3 by heat treatment such as yttrium oxide (Y2 O3 ) or an oxide, a carbonate or a nitrate of Y and a compound capable of similarly and easily producing Gd2 O3 by heat treatment, dissolving the compounds in an acid such as hydrochloric or nitric acid, adding oxalic acid thereto, precipitating the compounds as oxalates and then decomposing the coprecipitated oxalates at 1,000 deg.C for several hours. |
