Space-charge-limited current in organic light emitting diodes

作者：Torricelli Fabrizio^*; Zappa Dario; Colalongo Luigi

来源：Applied Physics Letters, 2010, 96(11): 113304.

DOI：10.1063/1.3358147

• carrier mobility
• mathematical analysis
• organic light emitting diodes

A physically based mathematical model for the dc current of single-carrier organic light emitting diodes is presented. The model accounts for the most important physical quantities that influence the carrier mobility and thus the device current itself: temperature, charge carrier concentration, and electric field. It is rigorously developed basing on the variable range hopping transport theory and extends the pioneering work of Mark and Helfrich [J. Appl. Phys. 33, 205 (1962)] to large electric fields typical of light emitting diodes. It was validated on experimental data collected from devices of different materials in a wide range of operating conditions. Thanks to the effective electric field approach, the mathematical expression is simple, accurate and suitable for CAD applications.

• 出版日期2010-3-15