TY - JOUR
T1 - High efficiency tandem organic light emitting diode using an organic heterojunction as the charge generation layer
T2 - An investigation into the charge generation model and device performance
AU - Sun, Hengda
AU - Guo, Qingxun
AU - Yang, Dezhi
AU - Chen, Yonghua
AU - Chen, Jiangshan
AU - Ma, Dongge
N1 - Publisher Copyright:
© 2015 American Chemical Society.
PY - 2015/2/18
Y1 - 2015/2/18
N2 - Organic heterojunctions (OHJs) are frequently used as charge generation layers (CGLs) in the construction of high efficiency tandem organic light emitting diodes (OLEDs). However, the charge generation mechanism still remains unclear. In this article, the working principle of a typical OHJ CGL composed of 1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN)/ 4,4′,4″-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA) is studied. We found that the charge generation process in this OHJ results from electron tunneling, which is shown through temperature-dependent J-V characteristics and model fitting. Additionally, we fabricated an ultrahigh efficiency green tandem OLED using only commercially available organic semiconductor materials for OLED. The maximum power efficiency reaches 120 lm/W, yet remains at 110.3 lm/W at 1000 cd/m 2 , which is greatly enhanced from when compared to the corresponding single-unit device. The maximum current efficiency and external quantum efficiency reach as high as 201 cd/A and 54.5%, respectively.
AB - Organic heterojunctions (OHJs) are frequently used as charge generation layers (CGLs) in the construction of high efficiency tandem organic light emitting diodes (OLEDs). However, the charge generation mechanism still remains unclear. In this article, the working principle of a typical OHJ CGL composed of 1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN)/ 4,4′,4″-tris(N-3-methylphenyl-N-phenylamino)triphenylamine (m-MTDATA) is studied. We found that the charge generation process in this OHJ results from electron tunneling, which is shown through temperature-dependent J-V characteristics and model fitting. Additionally, we fabricated an ultrahigh efficiency green tandem OLED using only commercially available organic semiconductor materials for OLED. The maximum power efficiency reaches 120 lm/W, yet remains at 110.3 lm/W at 1000 cd/m 2 , which is greatly enhanced from when compared to the corresponding single-unit device. The maximum current efficiency and external quantum efficiency reach as high as 201 cd/A and 54.5%, respectively.
KW - charge generation layers
KW - charge tunneling
KW - organic heterojunctions
KW - organic light-emitting diodes
UR - http://www.scopus.com/inward/record.url?scp=84923373207&partnerID=8YFLogxK
U2 - 10.1021/acsphotonics.5b00010
DO - 10.1021/acsphotonics.5b00010
M3 - 文章
AN - SCOPUS:84923373207
SN - 2330-4022
VL - 2
SP - 271
EP - 279
JO - ACS Photonics
JF - ACS Photonics
IS - 2
ER -