1. Faculty of Engineering, Saitama University, 255 Shimo‐okubo, Sakura‐ku, Saitama‐shi, Saitama 338‐8570, Japan;2. Key Laboratory of Advanced Display and System Applications, Ministry of Education, Shanghai University, P.O. Box 143, 149 Yanchang Road, Shanghai 200072, P.R. China;3. Faculty of Textile Science and Technology, Shinshu University, 3‐15‐1 Tokida, Ueda, Nagano 386‐8567, Japan
Abstract:
We demonstrated important changes produced on the modulation frequency of hybrid organic–inorganic light‐emitting diodes to examine the applicability as a light source for visible optical communications. The fabricated device structure was 4,4′‐bis[N ‐(1‐napthyl)‐N ‐phenyl‐amino]biphenyl/4,4′‐(bis(9‐ethyl‐3‐carbazovinylene)‐1,1′‐biphenyl:4,4′‐bis[9‐dicarbazolyl]‐2,2′‐biphenyl/ZnS/LiF/MgAg. This device showed an improvement in the modulation frequency using ZnS instead of an organic material, tris(8‐hydroxyquinoline)aluminum. A maximum cutoff frequency of 20.6 MHz was achieved.
