Efficiency of blue organic light-emitting diode enhanced by inserting charge control layers into emission region

doi:10.1088/1674-1056/22/4/047806

Abstract We demonstrate high current efficiency of blue fluorescent organic light-emitting diode (OLED) by using the charge control layers (CCLs) based on Alq₃. The CCLs that are inserted into the emitting layers (EMLs) could impede the hole injection and facilitate the electron transport, which can improve the carrier balance and further expand the exciton generation region. The maximal current efficiency of the optimal device is 5.89 cd/A at 1.81 mA/cm², which is about 2.19 times higher than that of the control device (CD) without the CCL, and the maximal luminance is 19.660 cd/m² at 12 V. The device shows a good color stability though the green light emitting material Alq₃ is introduced as CCL in the EML, but it has a poor lifetime due to the formation of cationic Alq₃ species.

Keywords: organic light-emitting devices charge control layer current efficiency

Received: 28 April 2012
Revised: 01 November 2012
Accepted manuscript online:

PACS:	78.60.Fi	(Electroluminescence)
	85.60.Jb	(Light-emitting devices)
	78.55.-m	(Photoluminescence, properties and materials)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 60906022 and 60676051), the Natural Science Foundation of Tianjin, China (Grant No. 10JCYBJC01100), the Scientific Developing Foundation of Tianjin Education Commission, China (Grant No. 2011ZD02), the Jiangsu Provincial Natural Science Development Foundation for University, China (Grant No. 09KJB140006), and the Tianjin Natural Science Council (Grant No. 10SYSYJC28100).

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

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Bai Juan-Juan (白娟娟), Wu Xiao-Ming (吴晓明), Hua Yu-Lin (华玉林), Mu Xue (穆雪), Bi Wen-Tao (毕文涛), Su Yue-Ju (苏跃举), Jiao Zhi-Qiang (焦志强), Shen Li-Ying (申利莹), Yin Shou-Gen (印寿根), Zheng Jia-Jin (郑加金) Efficiency of blue organic light-emitting diode enhanced by inserting charge control layers into emission region 2013 Chin. Phys. B 22 047806

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Efficiency of blue organic light-emitting diode enhanced by inserting charge control layers into emission region

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