BaMgAl10O17:Eu2+荧光粉的化学共沉淀法合成及其发光性质

以(NH4)2CO3为沉淀荆采用化学共沉淀法在1350℃成功合成了单相Ba3-xEuxMgAl10O17(0．02≤x≤0．14)蓝色荧光粉。合成温度比传统的高温固相法降低了约250℃。制备的荧光粉颗粒呈准球状形貌,分布均匀且无烧结。晶粒尺寸在0．3μm左右。在254nm紫外光激发下．发射光谱的最大峰值在450nm附近。发射强度比高温固相法提高了大约15％。当x=0．10时发射强度最高。     

GdAl3(BO3)4:Eu3+荧光粉的光致发光特性

用硝酸盐热分解法合成了单相粉末样品Gd1-xEuzAl3(BO3)4(0≤x≤1),研究了Eu^3 在GdAl3(BO3)4中的紫外和真空紫外光谱性质．GdAl3(BO3)4：Eu^3 中稀土离子占据非中心对称的格位，Eu^3 在其中的特征发射以^5D0→^7F2电偶极跃迁为主,在147nm激发下GdAl3(BO3)4：Eu^3 呈色坐标为(0．645，0．330)的强红光发射，说明是非常有前途的PDP用红色发光材料,在GdAl3(BO3)4：Eu^3 的真空紫外光谱中观察到两个峰，158nm的激发带归属于B03基团的吸收，258nm处的激发带为Eu^3 →O^2-的电荷转移跃迁带．在147nm激发下，GdAl3(BO3)4：Eu^3 的红光发射强度随着Eu^3 浓度的增加而减弱，而在258nm激发下随Eu^3 浓度的增大Eu^3 的红光发射增强，说明它们发光的机理不同。     

Synthesis and Photoluminescence of BaMgAl10O17 ：Eu^2＋ Phosphor by Oxalate Co-precipitation Process

Single phase of Ba1-x MgAl10O17 ： x Eu^2＋ （0.02≤ x ≤ 0. 14） phosphors was first successfully prepared by coprecipitation in aqueous medium with a “reverse strike” method, using oxalic acid and ammonia together as precipitants. Completely crystallized phosphors were obtained at 1300 ℃, which is 300 ℃ lower than the temperature of solid-state reaction. Their photoluminescence was investigated under UV and VUV region, respectively. The emission spectra of Ba1-x MgAl10O17：xEu^2＋ samples excited by 254 or 147 nm showed a characteristic wide band with the peak centred at about 450 454 nm. Optimum emission intensity reached at x = 0.1 and then concentration quenching occurred. The synthesized phosphor shows 10% higher emission intensity than that prepared by solid-state reaction.     

BaMgAl_(10)O_(17)∶Eu~(2+)荧光粉的化学共沉淀法合成及其发光性质

以(NH4)2CO3为沉淀剂采用化学共沉淀法在1350℃成功合成了单相Ba1-xEuxMgAl10O17(0.02≤x≤0.14)蓝色荧光粉。合成温度比传统的高温固相法降低了约250℃。制备的荧光粉颗粒呈准球状形貌,分布均匀且无烧结,晶粒尺寸在0.3μm左右。在254nm紫外光激发下,发射光谱的最大峰值在450nm附近,发射强度比高温固相法提高了大约15%。当x=0.10时发射强度最高。     

Synthesis and Photoluminescence of BaMgAl_(10)O_(17)∶Eu~(2 ) Phosphor by Oxalate Co-precipitation Process

Color plasma display panels (PDPs) have attract-ed considerable interest in recent years as componentsof wall-mounted television sets that are large ,flat andthin .In PDPs ,tricolor phosphors are used to convertthe vacuum ultraviolet (VUV) radiation into …     

BaMgAl10O17:Eu2+的硝酸盐热分解法合成及其发光特性研究

以Ba(NO3)2、Al(NO3)3·9H2O、Mg(NO3)2·6H2O和Eu(NO3)3为初始原料,首次用硝酸盐热分解法在1300℃左右合成了单相Ba1-xMgAl10O17xEu2+(0.02≤x≤0.16)并表征了其发光特性.结果表明,硝酸盐热分解法的合成温度比传统的高温固相法降低了近300℃,且合成出的荧光粉体色白、亮度好、结构松散且无烧结现象.在254 nm紫外光激发下,Ba1-xEuxMgAl10O17(0.02≤x≤0.16)的最强峰在450 nm左右,属于Eu2+的4f65d→4f7(8S7/2)宽带允许跃迁;当x=0.1时发光强度最高.用硝酸盐热分解法合成的样品较传统高温固相法所得样品的发光强度强.