1. The influence of polarization in LiF molecules on the magnetic field effects in OLEDs
- Author
-
Lei Yan-Lian, Zhang Yong, Bai Jiangwen, Zhang Qiao-Ming, and Xiong Zuhong
- Subjects
Multidisciplinary ,Materials science ,business.industry ,Doping ,Lithium fluoride ,Dielectric ,Electroluminescence ,Magnetic field ,Condensed Matter::Materials Science ,chemistry.chemical_compound ,chemistry ,Electric field ,OLED ,Optoelectronics ,Condensed Matter::Strongly Correlated Electrons ,business ,Polarization (electrochemistry) - Abstract
Doping lithium fluoride (LiF) in the fluorescent layer of conventional organic light-emitting diode is able to effectively tune the magnetic field effects (MFEs) on the current and electroluminescence. As compared with the undoped device, the line-shape and amplitude of MFEs in LiF-doped device showed apparent variation. At room temperature, when the applied external magnetic field reached several hundreds mili-Tesla, the MFEs in conventional device slowly increased and tended to be saturated. However, the MFEs in doped device almost linearly increased with the increasing field, displaying the abnormal and unsaturated high-field effects. Additionally, the amplitudes of high-field effects in current and fluorescence all went up firstly and down later when increasing the doping concentration of LiF. The differences between the MFEs in doped and undoped devices can be attributed to the dielectric polarization of LiF particles in the devices internal electric field. The reaction between the excitons in fluorescent layer and polarization charges on the surface of LiF particles resulted in the special MFEs in doped device.
- Published
- 2013