Organic-inorganic layered perovskite, (C6H5C 2H4NH3)2PbI4, was grown on silica substrates or indium tin oxide (ITO) substrates by vacuum vapor deposition. High-quality layered perovskite films, which showed sharp and intense exciton peaks, were obtained when substrate surfaces were covered with either an octadecyltrichlorosilane (OTS) monolayer or a vacuum-deposited copper phthalocyanine (CuPc) layer. Light-emitting devices (LEDs) with structures of ITO/OTS/layered perovskite/2,9-dimethyl-4,7-diphenyl-l,10-phenanthroline (BCP)/2,4-pentanedionato lithium (Li acac)/Al, ITO/CuPc/ layered perovskite/BCP/Li acac/Al, and ITO/layered perovskite/BCP/Li acac/Al were fabricated. Sharp electroluminescence (EL) peaks from excitons stabilized in a quantum well structure were observed in each LED at 105 K. The LED with the CuPc layer exhibited the highest EL intensity and efficiency among the three LEDs. This EL enhancement is ascribed to the improvement in film properties and a decrease in the height of the hole injection barrier induced by growing the layered perovskite film on a CuPc layer.
|Number of pages||5|
|Journal||Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers|
|Publication status||Published - Mar 2005|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)