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在常规的有机发光二极管的发光层中掺入lithium fluoride(LiF),可以有效调控器件在不同温度下的电流与电致发光的磁场效应.与未掺杂的参考器件相比,LiF掺杂器件的磁场效应的线型与幅度都发生了明显的改变.在室温下,当外加磁场强度达到几百毫特斯拉时,常规器件的磁场效应随磁场增加缓慢增大并趋于饱和,而掺杂器件的磁场效应随磁场增加几乎呈直线增加,且表现出了不饱和的高场效应.此外,随LiF掺杂浓度的增大,电流与发光的高场效应的幅度均表现出先增加后降低的变化趋势.掺杂器件与未掺杂器件磁场效应的差异,可以归结为LiF颗粒在器件内电场中发生介电极化的结果.发光层中的激子与LiF颗粒表面的极化电荷发生反应,导致了器件特殊的磁场效应.
The incorporation of lithium fluoride (LiF) into the light-emitting layer of a conventional organic light-emitting diode can effectively control the current and electroluminescent magnetic field effect of the device at different temperatures. Compared with the undoped reference device, the LiF doped device The magnetic field effect of the linear and amplitude have undergone significant changes.At room temperature, when the applied magnetic field strength reaches several hundred mill Tesla, the magnetic field effect of the conventional device increases slowly and tends to saturation with the increase of the magnetic field, and doped The magnetic field effect of miscellaneous devices increases almost linearly with the increase of magnetic field, and shows the high field effect of unsaturated.In addition, with the increase of LiF doping concentration, the amplitude of current and luminescence high field effect firstly increases and then decreases The difference of the magnetic field effect between the doped and un-doped devices can be attributed to the dielectric polarization of the LiF particles in the electric field within the device.The excitons in the light-emitting layer and the polarized charges on the surface of the LiF particles occur Reaction, resulting in a special magnetic field effect of the device.