摘要
利用氮杂苯并 [9,10 ]菲类中性配体 ,合成了两个新型铕三元配合物Eu(DBM) 3 L1和Eu(DBM) 3 L2 (DBM为二苯甲酰甲烷 ;L1,L2 为氮杂苯并 [9,10 ]菲类中性配体 ) ,以元素分析、红外光谱和紫外光谱对其进行了表征 .两种配合物在固体状态下的发射光谱都表现出较强的三价铕离子的特征发射 ,第二配体对中心离子具有较好的协同敏化发光作用 .以TPD和Gd(DBM) 3 bath (bath =4,7 二苯基 1,10 菲咯啉 )分别作空穴传输材料和电子传输材料 ,以发光配合物和TPD的共蒸镀掺杂作为发光层 ,制备了如下结构的三层器件ITO/TPD( 3 0nm) /Eu(DBM) 3 L1(L2 )∶TPD( 1∶2 ) ( 5 0nm) /Gd(DBM) 3 bath( 3 0nm) /Mg∶Ag ,并研究了器件的光电特性 .结果表明 :这两种配合物具有优良的成膜性和电子传输性 ,而氮杂苯并 [9,10 ]菲类中性配体对提高配合物的电子传输性起着至关重要的作用 .以Eu(DBM) 3 L1和Eu(DBM) 3 L2 作为发光材料制备的器件均具有较低的启亮电压 ( 3V) ,分别在 12V ,5 2mA·cm-2 和 13V ,42mA·cm-2 时获得最大亮度为 14 8cd·m-2 和 110cd·m-2
With two azatriphenylene-type ligands, two novel ternary europium(III) complexes Eu(DBM)(3)L-1 and Eu(DBM)(3)L-2 (DBM = dibenzoylmethanato; L-1, L-2 = azatriphenylene-type ligands) have been synthesized and characterized by elemental analysis, IR and UV-Vis spectra. Photo-luminescent studies show that the synergistic complexation of the second ligand has indeed led to the construction of efficiently emitting europium(III) complexes, and as a result both complexes exhibit intense emission typical of Eu3+ ion. Using TPD as hole transporting material and Gd(DBM)(3)bath (bath = bathophenanthroline) as electron transporting material, three layer devices with the emitting layer formed by codeposition of luminescent complex and TPD were fabricated: ITO/TPD (30 run)/ Eu(DBM)(3)L-1 (L-2): TPD(1:2) (50 nm)/Gd(DBM)(3)bath(30 nm)/Mg : Ag. Based on the EL measurement results, it can be concluded that those ternary europium complexes possess excellent electron-transporting abilities, and the azatriphenylene-type second ligands play an important role in improving the electron-transporting abilities of the complexes. OEL devices with Eu(DBM)(3)L-1 and Eu(DBM)(3)L-2 as emitting materials have low onset driving voltage of 3 V, and the maximum pure red Eu (III)-based luminance of 148 cd.m(-2) and 110 cd.m(-2) were observed at 12 V, 52 mA.cm(-2) and 13 V, 42 mA.cm(-2) respectively.
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2004年第22期2265-2269,共5页
Acta Chimica Sinica
基金
河南省杰出青年基金 (No.0 31 2 0 0 0 70 0 )资助项目
