Effect of NaCl doped into Bphen layer on the performance of tandem organic light-emitting diodes  

作　　者：肖志慧 吴晓明 华玉林 毕文涛 王丽 张欣 辛利文 印寿根 

机构地区：[1]School of Materials Science and Engineering, Tianjin University of Technology [2]Key Laboratory of Display Materials and Photoelectric Devices,Ministry of Education [3]Tianjin Key Laboratory of Photoelectric Materials and Devices

出　　处：《Chinese Physics B》2014年第8期564-567,共4页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.60906022);the Natural Science Foundation of Tianjin,China(Grant No.10JCYBJC01100);the Scientific Developing Foundation of Tianjin Education Commission,China(Grant No.2011ZD02);the Key Science and Technology Support Program of Tianjin,China(Grant No.14ZCZDGX00006)

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 cartier 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：NaC1 （20 wt%） layer as the electron injection layer （ELL） 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.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 cartier 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：NaC1 （20 wt%） layer as the electron injection layer （ELL） 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.

关 键 词：tandem OLEDs NaCl doping charge generation layer 

分 类 号：TN312.8[电子电信—物理电子学] TG172.3[金属学及工艺—金属表面处理]