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

doi:10.1088/1674-1056/23/8/087811

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.

Keywords: tandem OLEDs NaCl doping charge generation layer

Received: 26 December 2013
Revised: 13 February 2014
Accepted manuscript online:

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

Fund: 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).

Corresponding Authors: Wu Xiao-Ming, Hua Yu-Lin
E-mail: wxm@mail.nankai.edu.cn;yulinhua@tjut.edu.cn

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Xiao Zhi-Hui (肖志慧), Wu Xiao-Ming (吴晓明), Hua Yu-Lin (华玉林), Bi Wen-Tao (毕文涛), Wang Li (王丽), Zhang Xin (张欣), Xin Li-Wen (辛利文), Yin Shou-Gen (印寿根) Effect of NaCl doped into Bphen layer on the performance of tandem organic light-emitting diodes 2014 Chin. Phys. B 23 087811

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[1]	Tandem white organic light-emitting diodes adopting a C₆₀：rubrene charge generation layer Bi Wen-Tao (毕文涛), Wu Xiao-Ming (吴晓明), Hua Yu-Lin (华玉林), Sun Jin-E (孙金娥), Xiao Zhi-Hui (肖志慧), Wang Li (王丽), Yin Shou-Gen (印寿根). Chin. Phys. B, 2014, 23(1): 017803.

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

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