一种新型铕配合物的有机电致发光性能  

Organic Electroluminescent Devices Using a New Organic Complex of Rare-earth Europium EuL_1L_2

作　　者：刘嵩[1] 杨利营[1] 张贺丰[1] 牛霞[1] 邓家春[1] 钟鼎[1] 华玉林[1] 印寿根[1] 杜晨霞[2] 

机构地区：[1]天津理工大学理学院材料物理研究所,天津300191 [2]郑州大学化学系,河南郑州450001

出　　处：《发光学报》2006年第4期553-556,共4页Chinese Journal of Luminescence

基　　金：国家自然科学基金(60276027);教育部科学技术研究重点(205007);天津市自然科学重点基金(033800311)资助项目

摘　　要：研究了一种新型的稀土金属铕配合物EuL1L2的光致发光和电致发光特性。将这种铕配合物掺杂到PVK∶PBD中,制备成结构为ITO/PVK∶PBD∶EuL1L2/PBD/A lq3/Mg∶Ag/Ag的器件,对其电致发光性能进行研究,发现Eu3+离子和A lq3的相对发光强度随PVK∶PBD∶EuL1L2和A lq3之间的激子阻挡层PBD的厚度变化而变化,通过调节PBD的厚度,得到了色纯度较高的红色电致发光器件,其光谱具有显著的Eu3+离子的光谱特征。Organic light-emitting diodes （OLEDs） are of great interest, since they efficiently emit light in the visible region and give promising applications. Full color displays require pure red, green and blue emission. However, the broad nature of the luminescent spectra of these organic molecules leads to the poor luminescent purity, which is dull and, thus, not suited for actual display applications. Rare earth complexes are very suitable for full color displays because of their sharp emission bands. In addition, EL efficiency based on rare earth complex is not limited by spin ruling, since their photoluminescence results from the formation of both singlets and triplets of the ligands, and then transferring energy to lanthanide cores. Theoretically, the upper limit of inner quantum efficiency can reach 100%, which is four times higher than that of the devices using other fluorescent material. For OLEDs, the development of high-performance red emission is still much in demand compared with both green and blue emission. A new organic complex of rare-earth europium （Eu） EuL1L2 was reported. The electroluminescence and photoluminescence of this Eu complex were studied. The multilayer devices with the structure of ITO/PVK： PBD： EuL1L2/PBD/Alq3/Mg： Ag/Ag were fabricated, using PVK： PBD： EuL1L2 as emitting layer, PBD as exciton block layer, and Alq3 as electron transporting layer. The emission from electron transfer layer was easily seen because the lifetime of exicton of Eu complex. In the experiment, a electron transfer material PBD was used as exciton block layer. Alq3 emission intensity become weaker than that of Eu complex, with the increase of the exciton block layer PBD thickness. As the block layer 80 nm, a pure red light with a peak of 612 nm and a half bandwidth of 10 nm, attribute to the emission of trivalent europium, was observed clearly. The assignment of the emission bands is referenced to analogous complex： 576 nm （5^D0→7^F0）, 590 nm （5^D0→7^F1 ）, 612 nm （5^D0→7^F2）

关 键 词：有机电致发光 铕配合物 红光 激子阻挡层 

分 类 号：TN383.1[电子电信—物理电子学] TN878.3