The Effect of Inorganic/Organic Hybrid Quantum-Well Structure on Efficient White Organic Light Emitting Devices
In this study, the effect of MQW structures adopting inorganic material (sodium fluoride) has been demonstrated. Brightness, current efficiency was significantly enhanced with a NaF/NPB MQW structure being inserted. The admittance spectroscopy was measured to explain the different mechanism of reducing hole between organic/organic inorganic/organic MQW
A novel hole-blocking layer NaF between the α-naphthylphenyliphenyl diamine and ITO
Abstract Organic light-emitting devices (OLEDs) with the hole-blocking layer NaF between the α-naphthylphenyliphenyl diamine and ITO were fabricated using a vacuum evaporation method. Compared to the different thickness of the hole-blocking layer, the OLEDs with the 1.0 nm thickness layer showed the maximum efficiency. The enhancements in efficiency were resulted from an improved balance of hole and electron injections. After comparing different hole-blocking layer density, NaF was a good candidate for the hole-blocking layer, and 1.0-nm thickness NaF layer showed better operational durability and life.
Molecular design of organic dyes for thin-film electroluminescent diodes
Abstract The design of organic compounds for multilayer thin-film electroluminescent diodes which are fabricated with vacuum-vapor deposition are described. The diodes with the two layer structure are composed of a hole transport layer (HTL) and an electron transport layer (ETL), and the diodes with the three layer structure are composed of HTL, thin emission layer (EML) and ETL. The molecular design of two oxadiazole derivatives which are suitable for the ETL is demonstrated. The use of quinacrydone dye for thermally stable HTL is proposed.