摘要
ZnS系列电致发光已经在低亮度照明、液晶显示、汽车和航空仪表等领域得到广泛的应用。Mn、Cu是ZnS电致发光材料常用的激活剂,Mn2+在晶体中形成橙色发光中心,发光中心波长580 nm;Cu+在晶体中不但形成发光中心,还形成发光所必需的CuxS,因此二者对发光亮度有明显的影响。由于ZnS∶Cu,Mn橙色发光材料中的Mn掺杂量较大,影响了发光材料的内在结构,在灼烧过程中Mn化合物的其他成分还可能对发光材料的亮度产生了不利的影响,导致发光材料的亮度远低于蓝绿色材料。采用在退火过程中添加适量的Mn、Cu化合物,通过低温扩散的方式,使Mn2+均匀进入到ZnS晶格,获得了亮度较高的ZnS∶Cu,Mn ACEL粉末材料。并对制备工艺中Cu、Mn含量、掺杂Mn化合物的形式、退火温度等对发光亮度的影响进行了讨论。实验中发现,在三种Mn化合物中(碳酸锰、乙酸锰、硫酸锰),以乙酸锰掺杂的材料亮度最高。得到Mn(以乙酸锰为添加物)的添加量为2%、Cu的添加量为0.1%、退火温度为700℃时,所制备的材料亮度最高。低温退火时掺杂Mn的材料亮度比常规材料的亮度高出1倍。
ZnS series electroluminescence have obtained extensive applications in low brightness illuminance, LCD, automobile and aircraft instrument etc. ZnS as electroluminescence material is always doped with Mn and Cu. Mn^2＋ ions form luminescent center of orange color emission with wavelength about 580 nm in the crystal, Cu^＋ ions form not only luminescent center, but also CusS which is indispensable to luminescence. Accordingly Mn and Cu have obvious influence on luminescence brightness. Due to the doping with more Mn in ZnS： Cu, Mn orange electroluminescence material, the excess of Mn will influence on internal structure of ZnS; and some else compounds of Mn would likely bring adverse influence on the brightness of electroluminescent material in burn process, which induce the brightness of electroluminescent material far lower than blue or green materials. In this paper, doping with proper compounds of Mn or Cu in annealing process, with the method of diffusion at low temperature, it make Mn^2＋ enter crystal lattice of ZnS evenly, and obtained ZnS： Cu, Mn ACEL powder material with higher brightness. The influences of content of Cu and Mn, categories of compound of doping Mn, and annealing temperature on luminescence brightness were discussed. The experimental results showed that among three categories compound of Mn （ carbonic acid manganese, acetic manganese, vitriol manganese）, the material with acetic manganese as dopant exhibits the maximal brightness. Ma- terials with highest brightness by this preparation were obtained at annealing temperature of 700 ℃ and doping dose of Mn （ acetic manganese as dopant） at 2%, and Cu at 0.1%. The brightness of the material doped with Mn is twice as higher as that of general material annealing at low temperature.
出处
《发光学报》
EI
CAS
CSCD
北大核心
2005年第6期733-736,共4页
Chinese Journal of Luminescence
基金
河北省自然科学基金资助项目(E200400011
F2004000130)
关键词
高亮度
橙色
电致发光
硫化锌
high brightness
orange
electroluminescence
ZnS
