A MODEL FOR THE CURRENT-VOLTAGE CHARACTERISTICS AND THE QUANTUM EFFICIENCY OF SINGLE-LAYER ORGANIC LIGHT-EMITTING-DIODES

A model for the current-voltage characteristics and the quantum effici ency of single-layer organic light emitting diodes is presented. With variables such as the electric field, the hole, and electron carrier d ensities, a set of coupled nonlinear differential equations is derived by using classical electrostatics and by assuming Fowler-Nordheim inj ection. Numerical calculations for different carrier mobility and barr ier height conditions show that low barrier height at both electrodes leads to higher efficiency and higher carrier mobility leads to higher brightness. We find that for applications that require high current i njection such as lasers, materials with high mobility are desired to r educe space charge effects. (C) 1997 American Institute of Physics.