Title :
Inverted Hybrid Inorganic–Organic Light-Emitting Diodes With Balanced Charge Injection
Author :
Cao, X.A. ; Acharya, Raj ; Li, X.M.
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng., West Virginia Univ., Morgantown, WV, USA
Abstract :
Green phosphorescent inverted hybrid inorganic-organic light-emitting diodes (IHyLEDs) based on a simplified organic layer/ WO3 structure have been demonstrated. The WO3 layer enabled facile hole injection and transport, which was balanced by efficient electron injection from the indium-tin-oxide (ITO) cathode overcoated with nanometer-thick Ca. The IHyLEDs had a turn-on voltage of 6 V. At 20 mA/cm2, it reached a luminance of 8133 cd/m 2 and a current efficiency of 40 cd/A, which were 43% higher than a similar IHyLED with a conventional Al/LiF electron injection layer. The IHyLEDs with Ca also exhibited improved reliability under constant-current stressing at 20 mA/cm2.
Keywords :
LED displays; coatings; electrochemical electrodes; organic light emitting diodes; phosphorescence; reliability; tungsten compounds; Al-LiF electron injection layer; IHyLED; ITO cathode; WO3; balanced charge injection; constant-current stressing; efficient electron injection; facile hole injection; facile hole transport; green phosphorescent inverted hybrid inorganic-organic light-emitting diode; indium-tin-oxide cathode; nanometer-thick Ca; overcoating; reliability; simplified organic layer-WO3 structure; voltage 6 V; Active matrix organic light emitting diodes; Cathodes; Charge carrier processes; Educational institutions; Indium tin oxide; Thin film transistors; Electroluminescence; hybrid junctions; light-emitting diodes (LEDs); organic compounds;
Journal_Title :
Display Technology, Journal of
DOI :
10.1109/JDT.2014.2306657
