Hybrid white OLEDs with color stability utilizing blue emission supporting layer

We fabricated hybrid white OLEDs with emission supporting layer (ESL) composed of 2', 2',2"-(1,3,5-Benzinetriyl)-tris(1-phenyl-1-H-b enzimidazole) (TPBi) as electron transport layer (ETL) with blue fluorescent emitting material such as N,N'-di-1-na-phthalenyl-N,N'- diphenyl-[1,1 ':4, 1 ":4", 1 m-quaterphenyl]-4,4'"- diamine (4P-NPD). The hybrid white OLED has single-emissive layer (SEL) with doping 4P-NPD into electron transport layer (ETL) additionally. We investigated electro-optical characteristics of hybrid white OLEDs such as current density, luminous efficiency, color coordinates and CIExy.