共沉淀法合成Sm^(3+)掺杂的Sr_2CeO_4的荧光光谱  

Luminescence Spectra of Sm^(3+) Doped Sr_2CeO_4 Synthesized through Co-Precipitation Process

作　　者：石士考[1] 栗俊敏[1] 周济[2] 

机构地区：[1]河北师范大学化学学院,河北石家庄050091 [2]清华大学材料科学与工程系新型陶瓷和精细工艺国家重点实验室,北京100084

出　　处：《光谱学与光谱分析》2005年第10期1739-1741,共3页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金(50472020);河北师范大学重点科研基金(L2003Z04);清华大学基础科研基金(JZ2001008)资助

摘　　要：以(NH4)2C2O4为沉淀剂,用Sr,Ce和Sm的硝酸盐为反应物,制备了Sr2CeO4:Sm的前驱体。将此前驱体烧结后,得到了Sm掺杂的Sr2CeO4白色荧光材料。其荧光光谱强度与烧结温度和Sm3+的掺杂浓度密切相关,当烧结温度为1 050℃以及Sm3+的掺杂浓度为1 mol%时,峰值为470 nm的宽带以及Sm3+在608和654 nm的线谱发射最强。同直接在高温固相反应下得到的样品进行比较,其发射光谱强度大大提高。The precursor powders of Sm^3＋ doped Sr2CeO4 were obtained by the application of （NH4）2C2O4 as a precipitant. After calcinations, the precursor powders became a white emitting fluorescent material. The XRD and emission spectra manifest that the optimum temperature and Sm^3＋ concentration for synthesizing Sr2CeO4 ：Sm are 1050℃ and 1 mol%, respectively. The better the phosphor powders crystallize, the higher their emission intensities are. The excitation spectrum implies that the transition emissions of Sm^3＋ at 608 and 654 nm originate from the Ce^4＋ -O^2- charge transfer （MLCT） resulting from the interaction of Ce^4＋ and the neighboring O^2- . Therefore, it can be concluded that the host Sr2CeO4 acts as a sensitizer, which transfers the energy to Sm^3＋ . The emission intensity of the phosphor synthesized through co-precipitation is much higher than that of phosphor prepared using conventional solid state reactions.

关 键 词：共沉淀法 SR2CEO4 SM^3+ 荧光光谱 

分 类 号：O482.3[理学—固体物理]