【摘要】 提出了BAM的热劣化模型 ,该模型能较好地说明热处理气氛中含氧量同BAM热劣化程度的关系。BAM的热劣化程度ΔZ与气氛中氧分压的 1/ 6次方 (PO2 )成正比 ,符合关系式ΔZ =α(PO2 ) 1/ 6+ β。α是与温度有关的参数 ,随温度升高 ,α增大 ;β在数值上等于氧分压为零时的ΔZ值。按照上述关系式 ,作者对热劣化实验数据作了拟合 ,两者能较好地吻合更多还原

【Abstract】 For BAM,a serious thermal degradation takes place after annealing in air.The same BAM phosphors may exhibit a large difference in different annealing processes.It is known that thermal degradation of BAM is relevant to annealing process. Since in PDP and fluorescent lamp manufacturing processes the phosphor is heated in air or oxygen containing gas at 600℃ to make phosphor layer,it is important to show effect of oxygen concentration in gas and mechanism of thermal degradation of BAM. In this paper a model of thermal degradation of the blue emitting BaMgAl 10 O 17 ∶Eu(BAM)phosphor is presented to disclose effect of oxygen concentration on luminance decrease, Δ Z ,in BAM after annealing in oxygen containing gas. According to the model,Δ Z is proportional to one sixth power of oxygen partial pressure,(P O 2 ) 1/6 ,and satisfies the following equation: Δ Z =α(P O 2 ) 1/6 +β There,α is a temperature dependent parameter and increases with temperature,and β has the value of Δ Z as P O 2 =0.The experimental results of thermal degradation of BAM in gas with different oxygen concentrations at different temperatures were simulated by using the above equation.We got the formulae of ΔZ at 600℃,615℃,675℃ as follow: 600℃:Δ Z =0 85(P O 2 ) 1/6 +6 35 615℃:Δ Z =1 05(P O 2 ) 1/6 +6 06 675℃:Δ Z =1 62(P O 2 ) 1/6 +5 28 This stiumlation results indicate that 1)when O 2%<10%,P O 2 has much effect on Δ Z ; and however, when O 2%>10%,P O 2 has little effect on Δ Z ,finally,Δ Z approaches to 12% at 600℃,13 5% at 615℃ and 17% at 675℃;2)with increasing temperature, the temperature dependent parameter α increases and the thermal degradation of BAM increases.更多还原