Organic-inorganic multilayer structures: A novel route to highly efficient organic light-emitting diodes

A novel device structure for organic light-emitting diodes (OLEDs) is described, which consists in the most general case of an alternating sequence of thin inorganic and organic layers sandwiched between two electrodes. Compared to conventional OLEDs, these devices have a significantly enhanced current flow, increased brightness, and higher luminous efficiency at a given voltage. These improvements in performance can be attributed to increased and more balanced charge-carrier injection as well as charge-carrier confinement effects, which together lead to higher radiative recombination probability. © 1999 Elsevier Science S.A. All rights reserved.