›› 2014, Vol. 23 ›› Issue (8): 87811-087811.doi: 10.1088/1674-1056/23/8/087811
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
肖志慧a b c, 吴晓明a b c, 华玉林a b c, 毕文涛a b c, 王丽a b c, 张欣a b c, 辛利文a b c, 印寿根a b c
Xiao Zhi-Hui (肖志慧)a b c, Wu Xiao-Ming (吴晓明)a b c, Hua Yu-Lin (华玉林)a b c, Bi Wen-Tao (毕文涛)a b c, Wang Li (王丽)a b c, Zhang Xin (张欣)a b c, Xin Li-Wen (辛利文)a b c, Yin Shou-Gen (印寿根)a b c
摘要: To improve the performance of tandem organic light-emitting diodes (OLEDs), we study the novel NaCl as n-type dopant in Bphen:NaCl layer. By analyzing their relevant energy levels and carrier transporting characteristics, we discuss the mechanisms of the effective charge generation layer (CGL) of Bphen:NaCl (6 wt%)/MoO3. In addition, we use the Bphen:NaCl (20 wt%) layer as the electron injection layer (EIL) combining the CGL to further improve the performance of tandem device. For this tandem device, the maximal current efficiency of 9.32 cd/A and the maximal power efficiency of 1.93 lm/W are obtained, which are enhanced approximately by 2.1 and 1.1 times compared with those of the single-emissive-unit device respectively. We attribute this improvement to the increase of electron injection ability by introducing of Bphen:NaCl layer. Moreover, the CGL is almost completely transparent in the visible light region, which is also important to achieve an efficient tandem OLEDs.
中图分类号: (Electroluminescence)