BaMgAl_(10)O_(17):Eu^(2+)的硝酸盐热分解法合成及其发光特性研究

Nitrate Pyrogenation Synthesis and Photoluminescence of BaMgAl_(10)O_(17)∶Eu^(2+) Phosphor

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-xMgAl10O17∶xEu2+(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254nm紫外光激发下,Ba1-xEuxMgAl10O17(0.02≤x≤0.16)的最强峰在450nm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。

Single phase of Ba_(1-x)Eu_xMgAl_(10)O_(17)(0.02≤x≤0.16) phosphor was first prepared by nitrate pyrogenation reaction using Ba(NO_3)_2,Al(NO_3)_3·9H_2O,Mg(NO_3)_2·6H_2O and Eu (NO_3)_3 as starting materials. Their photoluminescence was investigated under UV region. Completely crystallized phosphors were obtained at 1 300 ℃, which is 300 ℃ lower than the temperature of solid-state method. The emission spectrum excited by 254 nm showed a characteristic wide band with the peak at about 450 nm. Optimum emission intensity was reached at x=0.1 and then concentration quenching occurred. The synthesized phosphor showed higher emission intensity than that prepared by solid-state method.