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

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

Authors :
Bai Juan-Juan
Wu Xiao-Ming
Hua Yu-Lin
Mu Xue
Bi Wen-Tao
Su Yue-Ju
Jiao Zhi-Qiang
Shen Li-Ying
Yin Shou-Gen
Zheng Jia-Jin
Source :
Chinese Physics B; 2013, Vol. 22 Issue 4, p1-4, 4p
Publication Year :
2013

Abstract

We demonstrate high current efficiency of a blue fluorescent organic light-emitting diode (OLED) by using the charge control layers (CCLs) based on Alq<subscript>3</subscript>. 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 Alq<subscript>3</subscript> is introduced as the CCL in the EML, but it has a poor lifetime due to the formation of cationic Alq<subscript>3</subscript> species. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
16741056
Volume :
22
Issue :
4
Database :
Complementary Index
Journal :
Chinese Physics B
Publication Type :
Academic Journal
Accession number :
90156269
Full Text :
https://doi.org/10.1088/1674-1056/22/4/047806