Highly efficient undoped deep-blue electroluminescent device based on a novel pyrene derivative

摘要

A novel pyrene derivative 1,6-bis(9,9-dimethylfluorenyl)pyrene (DFP) was synthesized and characterized by ~1H NMR spectrum, high resolution mass spectrum and elemental analysis. DFP exhibits bright blue emission both in solution and in solid thin film. Theoretical calculations show that the material has a non-coplanar structure and a high HOMO energy level. The undoped device based on DFP shows a stable deep-blue emission at 456 nm under different voltage (up to 10 V). The 1931 CIE coordinates (x=0.15, y=0.12) of the device are very close to the National Television Standards Committee's (NTSC) blue standard. The device achieves a maximum external quantum efficiency of 4.3% (current efficiency of 3.06 cd A~(-1)) at 19.8 mA cm~(-2) with a luminance of 607 cd m~(-2).