Aluminate green phosphor with small particle size used for PDP via co-precipitation method

摘要

Mg doped BaAl_(12)O_(19):Mn~(2＋) phosphor is one of the most efficient green phosphors for PDP. It is difficult to prepare the phosphor both have small particle size (＜3μm) and high luminescence. In the present work, a BaAl_(12)O_(19):Mn~(2＋) phosphor with small particle size was synthesized by the chemical co-precipitation method. Phase transformation and particle growth process during calcinning process were investigated. The nucleation process was also discussed. The results show that, the phase transformation is complicated, the transition phases include BaCO_3, γ-Al_2O_3, BaF_2, BaAl_2O_4 and two phases contain Mn; The BaAl_12O_19 phase is formed from the reaction between BaAl_2O_4 phase and γ-Al_2O_3 phase, no α-Al_2O_3 phase appears during the entire process; The formation temperature of pure BaAl_(12)O_(19) phase is 1200°C, which is lower than that in the high-temperature solid state reaction method. High efficiency BaAl_(12)O_(19):Mn~(2＋) phosphor with small particle size (＜2μm) and hexagonal flaky shape can be prepared by this method.