Blue-emitting materials and electroluminescent devices containing these materials
申请人:Lucent Technologies Inc.
公开号:EP0763965A2
公开(公告)日:1997-03-19
The present invention is directed to a class of blue emitting materials, that, when placed in EL devices with an emitter layer and a hole transporter layer, provide EL devices that emit white light. The blue-emitting material has a non-polymeric molecular structure that comprises a five or six-membered heterocyclic moiety selected from the groups consisting of oxazole, imidazole, quinoline and pyrazine with at least three organic substituents pendant thereto. The blue-emitting materials of the present invention have certain characteristics that allow them to be formed into films with advantageous properties. The films formed from these materials are amorphous (i.e they have a crystal size less than about 1000 Å). The thickness of the films of the blue-emitting material is less than 600 Å in the devices of the present invention.
本发明涉及一类蓝色发光材料,当将其置于带有发射器层和空穴传输层的电致发光器件中时,可提供发射白光的电致发光器件。该蓝色发光材料具有非聚合物分子结构,包括一个五元或六元杂环分子,该杂环分子选自由噁唑、咪唑、喹啉和吡嗪组成的基团,其上至少有三个有机取代基。本发明的发蓝材料具有某些特性,可将其制成具有优势特性的薄膜。由这些材料形成的薄膜是无定形的(即晶体尺寸小于约 1000 Å)。在本发明的设备中,蓝色发光材料薄膜的厚度小于 600 Å。