›› 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

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

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   

  1. a School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;
    b Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin 300384, China;
    c Tianjin Key Laboratory of Photoelectric Materials and Devices, Tianjin 300384, China
  • 收稿日期:2013-12-26 修回日期:2014-02-13 出版日期:2014-08-15 发布日期:2014-08-15
  • 基金资助:
    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), and the Key Science and Technology Support Program of Tianjin, China (Grant No. 14ZCZDGX00006).

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

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   

  1. a School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China;
    b Key Laboratory of Display Materials and Photoelectric Devices, Ministry of Education, Tianjin 300384, China;
    c Tianjin Key Laboratory of Photoelectric Materials and Devices, Tianjin 300384, China
  • Received:2013-12-26 Revised:2014-02-13 Online:2014-08-15 Published:2014-08-15
  • Contact: Wu Xiao-Ming, Hua Yu-Lin E-mail:wxm@mail.nankai.edu.cn;yulinhua@tjut.edu.cn
  • Supported by:
    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), and the Key Science and Technology Support Program of Tianjin, China (Grant No. 14ZCZDGX00006).

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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.

关键词: tandem OLEDs, NaCl doping, charge generation layer

Abstract: 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.

Key words: tandem OLEDs, NaCl doping, charge generation layer

中图分类号:  (Electroluminescence)

  • 78.60.Fi
73.40.-c (Electronic transport in interface structures) 73.50.Gr (Charge carriers: generation, recombination, lifetime, trapping, mean free paths)