A novel intermediate connector(IC) was formed which was composed of aluminum(Al, 3 nm)/1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile(HAT-CN).The 3-nm-thick Al in the IC is certified to efficiently generate intrins...A novel intermediate connector(IC) was formed which was composed of aluminum(Al, 3 nm)/1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile(HAT-CN).The 3-nm-thick Al in the IC is certified to efficiently generate intrinsic charge carriers, and the HAT-CN is proved to work as the holes injection layer(HIL) for the corresponding electroluminescent(EL) unit simultaneously.This simply IC comprehensively takes advantage of the features of the HAT-CN so as to stack two single EL units without introducing extra material.In addition to a significant enhancement in luminance and current efficiency, a current efficiency(CE) of 10.2 cd/A and a luminance of 2 042 cd/m^2 under the current density 20 mA/cm^2 of this tandem organic light emitting device(TOLED) are yielded, which are notably almost the sum of that of the two single-unit devices.展开更多
In this paper, a significant enhancement in current efficiency of the green tandem organic light-emitting diodes(TOLEDs) is demonstrated, which is based on a buffer-modified charge generation layer(CGL) of fullerene c...In this paper, a significant enhancement in current efficiency of the green tandem organic light-emitting diodes(TOLEDs) is demonstrated, which is based on a buffer-modified charge generation layer(CGL) of fullerene carbon(C60)/zinc-phthalocyanine(ZnPc). Al and MoO3 were used as the buffer-modified layers on both sides of the bilayer C60/ZnPc, respectively. Experimental results show that the inserted Al and MoO3 layers can effectively increase the electron extraction of the CGL for obtaining the device performance enhancement. Compared with that of the green TOLEDs without buffer-modified layers in CGL(37.3 cd·A-1), the current efficiency of the green TOLEDs is increased to 54.1 cd·A-1. Further study results find that the performance can also be improved by optimizing the thickness of Al in the CGL. The maximum current efficiency and maximum luminance of the green TOLEDs achieve 63.5 cd·A-1 and 17 873 cd·m-2, respectively, when the multilayer structure of the CGL is Al(3 nm)/C60(5 nm)/ZnPc(5 nm)/MoO3(3 nm).展开更多
基金supported by the National Natural Science Foundation of China(No.20172159)the Natural Science Foundation of Shaanxi Province(No.2017GY-105)
文摘A novel intermediate connector(IC) was formed which was composed of aluminum(Al, 3 nm)/1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile(HAT-CN).The 3-nm-thick Al in the IC is certified to efficiently generate intrinsic charge carriers, and the HAT-CN is proved to work as the holes injection layer(HIL) for the corresponding electroluminescent(EL) unit simultaneously.This simply IC comprehensively takes advantage of the features of the HAT-CN so as to stack two single EL units without introducing extra material.In addition to a significant enhancement in luminance and current efficiency, a current efficiency(CE) of 10.2 cd/A and a luminance of 2 042 cd/m^2 under the current density 20 mA/cm^2 of this tandem organic light emitting device(TOLED) are yielded, which are notably almost the sum of that of the two single-unit devices.
基金supported by the Scientific and Technological Research Foundation of Chongqing Municipal Education Commission(No.KJ1600439)the Basic and Advanced Technology Research Project of Chongqing Municipality(No.cstc2018jcyjAX0462)the Scientific and Technological Research Foundation of Chongqing Municipal Education Commission(No.KJ1500404)
文摘In this paper, a significant enhancement in current efficiency of the green tandem organic light-emitting diodes(TOLEDs) is demonstrated, which is based on a buffer-modified charge generation layer(CGL) of fullerene carbon(C60)/zinc-phthalocyanine(ZnPc). Al and MoO3 were used as the buffer-modified layers on both sides of the bilayer C60/ZnPc, respectively. Experimental results show that the inserted Al and MoO3 layers can effectively increase the electron extraction of the CGL for obtaining the device performance enhancement. Compared with that of the green TOLEDs without buffer-modified layers in CGL(37.3 cd·A-1), the current efficiency of the green TOLEDs is increased to 54.1 cd·A-1. Further study results find that the performance can also be improved by optimizing the thickness of Al in the CGL. The maximum current efficiency and maximum luminance of the green TOLEDs achieve 63.5 cd·A-1 and 17 873 cd·m-2, respectively, when the multilayer structure of the CGL is Al(3 nm)/C60(5 nm)/ZnPc(5 nm)/MoO3(3 nm).
