Compound, charge transporting material and organic electroluminescent element

Abstract

A charge transport material exhibiting excellent thermal stability, film forming capability, charge transport capability and luminescence characteristics; and an organic electroluminescent device of high luminance, high light emitting capability and prolonged operating life. There is provided a charge transport material comprising a compound containing two or more pyridine rings substituted at 2,4,6-positions in its molecule characterized in that the pyridine rings are substantially not conjugated with each other (provided that the pyridine rings may be optionally substituted at the 3,5-positions thereof), and further provided an organic electroluminescent device including the charge transport material.

Description

technical field [0001] The present invention relates to a novel charge transport material and a novel compound, and more particularly to a charge transport material which is stable even when electrooxidation or reduction is repeatedly performed, and an organic electroluminescent element using the charge transport material and having high efficiency and long life . Background technique [0002] As thin-film type electroluminescent (EL) elements, inorganic materials including group II-VI compounds such as ZnS, CaS or SrS doped with emission centers of Mn or rare earth elements (Eu, Ce, Tb or Sm) are common. However, EL elements prepared from this inorganic material involve the following problems: [0003] 1) They require reverse current drive (50-1000Hz); [0004] 2) They require high driving voltage (1-200V); [0005] 3) It is difficult to achieve full-color display (especially blue is difficult) by using them; and [0006] 4) They require expensive peripheral device driv...

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Problems solved by technology

[0005] 3) It is difficult to achieve full-color display (especially blue is difficult) by using them; and

[0006] 4) They require expensive peripheral device drive circuits

[0028] However, the insufficient hole-blocking properties of the above-mentioned compounds have caused problems of insufficient luminous efficiency of the device and oxidative deterioration of the material of the electron transport layer because part of the holes pass through the hole-blocking material to the electron transport layer.

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