论文部分内容阅读
制备了基于Alq3的有机发光二极管,器件结构为ITO/CuPc/NPB/Alq3/LiF/Al,并在不同温度下测量了器件在恒压偏置下传导电流的磁电导效应.当Alq3发光层的厚度为15nm时,在器件的传导电流从双极电流过渡到单极电流的过程中,器件的磁电导发生了明显的正负转变;而当Alq3发光层的厚度为65nm时,在传导电流从双极电流到单极电流的过渡过程中,器件的磁电导呈现随电流减小先上升后下降的变化趋势,但磁电导的值在任何测量条件下始终为正,并未出现正负转变的现象.双极电流的磁电导效应可用电子-空穴对模型和激子-电荷反应模型来进行解释,而单极电流的磁电导效应虽然可归因于器件中的极化子-双极化子转变,但仍需要进一步的研究.
The organic light-emitting diodes based on Alq3 were prepared and the device structure was ITO / CuPc / NPB / Alq3 / LiF / Al. The magneto-conductance effect of the device under constant voltage bias was measured at different temperatures. The thickness of 15nm, the device in the conduction current from bipolar current to monopolar current transition process, the device had a significant positive and negative magnetic conductivity; and when the Alq3 light-emitting layer thickness of 65nm, the conduction current from During the transition from bipolar current to unipolar current, the magneto-conductance of the device shows a trend of first increasing and then decreasing with the decrease of current, but the value of magneto-conductance is always positive under any measurement condition, and there is no positive or negative transition Phenomenon.The bipolar current magneto-conductance effect can be explained by the electron-hole pair model and the exciton-charge reaction model, while the monopolar current magneto-conductance effect may be due to the device’s polaron-dual polarization Sub-transformation, but still need further study.