Abstract
AbstractAll‐solution‐processed multilayer blue small molecular organic light‐emitting diodes are fabri‐cated by blade coating method. Fluorescent blue host,1‐(7‐(9,9′‐bianthracen‐10‐yl)‐ 9,9‐dioctyl‐9H‐fluoren‐2‐yl)pyrene, and blue dopant, 4,4′‐(1E,1′E)‐2,2′‐(naphthalene‐2,6‐diyl)bis(ethene‐2,1‐diyl)bis(N,N‐bis(4‐hexylphenyl) aniline), are synthesized to achieve good solubility and pinhole‐free thin film by solution process. The multilayer device structure with hole/electron transport layer is achieved by blade coating method without the dissolution problem between layers. The efficiency of the all‐solution‐processed device is 4.8 cd/A at 1,200 cd/m2, close to that by thermal deposition in high vacuum chamber.
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