A New Iridium Complex with Trifluoromethyl-Substituted 2-benzo[b]thiophen-2-yl-pyridine Ligand and Its Application in OLEDs
A New Iridium Complex with Trifluoromethyl-Substituted 2-benzo[b]thiophen-2-yl-pyridine Ligand and Its Application in OLEDs
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发表时间：
2007-06
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通讯作者：
Maoliang Xu;Wenlian Li;Ming-tao Li;Geyang Wang;R. Zhou;Weisong Du
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作者：
Maoliang Xu;Wenlian Li;Ming-tao Li;Geyang Wang;R. Zhou;Weisong Du
通过在2-苯并[b]-噻吩基-2-基吡啶的吡啶环5-位引入一个三氟甲基，合成了一种新的以吡啶-2-羧酸为辅助配体的红色发光Ir络合物[(Btfmp)2Ir(Pic)]，并对其进行了表征。我们观察到，配体5-位上的CF3取代基可以减小HOMO和LUMO能级之间的带隙，从而导致发射波长的较大红移，但吡啶-2-羧酸作为辅助配体导致发射向蓝移。结果表明，在637 nm红光发射的基础上，获得了峰值亮度效率为3.0cd/A的饱和红光EL和CIE色坐标(x=0.65，y=0.29)，它们在不同的驱动电流下几乎没有变化。
By introducing a trifluoromethyl group on 5-position of the pyridyl ring of 2-benzo[b] thiophen-2-yl-pyridine, a new red emission iridium complex [(btfmp)2Ir(pic)] using pyridyl-2-carboxylic acid as ancilary ligand was synthesized and characterized. We observed that a CF3 substituent on the 5-position of the ligand can decrease in the bandgap between the HOMO and LUMO levels, so as to result in large red shift of the emission baud, but pyridyl-2-carboxylic acid acted as the ancilary ligand lead to emission shifting to blue. As a result saturated red light emitting EL based on red emission at 637 nm from the iridium complex as observed, a peak luminance efficiency of 3.0 cd/A, and the CIE color coordinates of (x=0.65, y=0.29) which are almost not changed under the varied driving current were obtained.