Phosphine sulfur group electron transport material, preparation method and application thereof

Abstract

Belonging to the field of organic semiconductors, the invention discloses a phosphine sulfur group electron transport material, a preparation method and application thereof. The structural formula of the host material is shown as the specification. In the phosphine sulfur group electron transport material provided by the invention, dibenzofuran has a large plane rigid structure; and the diphenyl diphenyl phosphine sulfur group contains electron-withdrawing P=S, and is a good electron transport unit. Thus, the material has high electron mobility and good thermal stability, and can be used as an electron transport layer in organic electroluminescent devices to improve the luminous efficiency.

Description

technical field

[0001] The invention relates to the field of organic semiconductor materials, in particular to a phosphine-thio-based electron transport material and its preparation method and application. Background technique

[0002] Organic electroluminescent devices have excellent characteristics such as lightness, thinness, self-luminescence, low power consumption, no need for light source, no viewing angle limitation, high reaction rate and can be fabricated on flexible substrates. Tomorrow's star. The carrier mobility of traditional electron transport materials is one-thousandth of that of hole transport materials, and the thermal stability is not good. Therefore, it often leads to problems such as poor luminous efficiency or short service life of components. According to relevant literature The charge consumption ratio of electron transport materials is 35.9%, which is second only to the consumption of the light-emitting layer (39.8%). Therefore, the development of ...

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