63295-61-4

Provided is an arylamine derivative that effectively absorbs a high-energy external light source in a UV region and minimizes damage to organic matter inside an organic electroluminescent device, thereby contributing to a substantial improvement in the lifespan of the organic electroluminescent device. An organic electroluminescent device according to the present invention comprises a first electrode, a second electrode, and one or more organic material layers provided between the first electrode and the second electrode. The organic material layer contains an arylamine derivative representedby chemical formula 1. In the chemical formula 1, the definition of each substituent is the same as the definition in the specific embodiment of the invention.

Provided is an arylamine derivative effectively absorbing a high energy external light source of an ultraviolet (UV) region to minimize damage to organic materials in an organic electroluminescent device so as to contribute to substantial life extension of the organic electroluminescent device. According to the present invention, the organic electroluminescent device comprises: a first electrode; an organic film disposed on the first electrode; a second electrode disposed on the organic film; and a capping layer disposed on the second electrode. Moreover, the organic film and/or the capping layer include an arylamine derivative represented by chemical formula 1, wherein each substituent is the same as in the detailed description.COPYRIGHT KIPO 2019

N-(substituted-benzoyl)-1-aminonaphthalenes and N-(substituted-benzoyl)-2-aminonaphthalenes (1-NBAs and 2-NBAs) with varied substituents at the para- or meta-position of benzoylphenyl ring were prepared to probe the difference between 1-aminonaphthalene (1-AN) and 2-aminonaphthalene (2-AN) as electron donors, using benzanilide-like charge transfer as a probe reaction. An abnormal long-wavelength emission was found for all of the prepared aminonaphthalene derivatives in cyclohexane and was assigned to the CT state by the observation of a substantial red shift with increasing solvent polarity or with increasing electron-withdrawing ability of the substituent. The CT emission energies were found to follow a linear relationship with the Hammett constant of the substituent and the value of the linear slope for 1-NBAs (-0.45 eV) was higher than that of 2-NBAs(-0.35 eV), the latter being close to that of the aniline derivatives (BAs, -0.345 eV). This pointed to a higher extent of charge separation in the CT state of 1-NBAs in which a full charge separation was established by the reduction potential dependence of the CT emission energy with a linear slope of -1.00. The possible contribution of the difference in the steric effect and the electron donating ability of the donors in 1-NBAs and 2-NBAs was ruled out by the observation that the corresponding linear slopes of benzoyl-substituted BAs remained unchanged when para-, meta-, ortho-, or ortho, ortho-methyls were introduced into the aniline moiety. It was therefore concluded that 1-AN enhanced the charge transfer in 1-NBAs and the proximity of its 1La and 1Lb states was suggested to be responsible. Results showed that the charge transfers in 1-NBAs and 2-NBAs were not the same and 1-AN and 2-AN as electron donors were different not only in electron donating ability but in shaping the charge transfer pathways as well.