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为了增加电子注入,蓝色有机电致发光器件中通常包含一层由发绿光的Alq组成的电子传输层,因此器件的发光常常不可避免地要出现Alq本身的发光从而影响器件的发光色纯度。在以胺类衍生物(N,N’-diphenyl-N,N’-bis(3-methylphenyl)-1,1’biphenyl-4,4’diamine,TPD)为空穴传输层,DSA衍生物(4,4’-bis(2,2-diphenylvinyl)-1,1’-biphenyl,DPVBi)为发光层,当用Liq为电子注入层与Al结合构成复合电极时所制备的双层单异质结蓝色有机电致发光器件中由于去除了Alq而得到色度纯正的DPVBi的发光,同时又保持了较高的发光效率。
In order to increase the electron injection, the blue organic electroluminescent device usually contains an electron transport layer composed of green-emitting Alq. Therefore, the light emission of the device often inevitably occurs due to the luminescence of the Alq itself, thereby affecting the luminescent color purity of the device . In the case of a hole transport layer using N’-bis (3-methylphenyl) -1,1’biphenyl-4,4’diamine (TPD) as an amine derivative, the DSA derivative 4,4’-bis (2,2-diphenylvinyl) -1,1’-biphenyl (DPVBi) is a light emitting layer. When the composite electrode is formed by combining Li with an electron injection layer to form a double-layered single heterojunction In the blue organic electroluminescent device, the emission of chromaticity-pure DPVBi is obtained by removing Alq while maintaining high luminous efficiency.