Low Operating Voltage and High Efficiency Organic Multilayer Electroluminescent Devices with p-Type Doped Hole Injection Layer : Atoms, Molecules, and Chemical Physics

概要

論文の詳細を見る
We demonstrate efficient organic electroluminescent devices with multiple well structure and a p-doped hole injection and transport layer (HTL). The multiple well structure improves the efficiency and the controlled p-doped HTL leads to a lower operating voltage. An amorphous starburst [4,4^',4^<">-tris(N,N-diphenylamino) triphenylamine] doped with a strong organic acceptor, tetrafluoro-tetracyano-quinodimethane serves as the HTL material, a spiro-linked compound, 2,2^',7^',7^'-tetra-kis-(diphenylamine)-9,9^'-spirobifluorene as an interlayer to provide a favorable interface and as a barrier within the multiple well structure and 8-tris-hydroxyquinoline as an emitter and well. The double-well device exhibits low operating voltage, less than 4V, for obtaining 100 cd/m^2 and the highest current efficiency exceeding 5 cd/A. Changes in the spectra due to the different well structures are also discussed.
社団法人応用物理学会の論文
2001-11-15