吉林大学博士学位论文 3. 基于自旋电子学的研究进展，我们首次提出通过选择合适的磁性材料来控制注入到有机电致发光器件中的载流子的自旋方向，使在发光区只形成单线态激子，从而提高有机电致荧光器件的效率的设想。我们认为如果能控制从阳极注入的空穴都是下自旋（自旋量子数为-1/2）从阴极注入的电子都是上自旋（自旋量子数为+1/2），这样当他们在发光区相遇时，就只形成单线态激子而不形成三线态激子了。
我们初步研究了有机电致发光器件的自旋注入，制作了以铁磁金属Ni做电极的有机电致发光器件，并测试了Ni做阳极的器件所发射的光的偏振特性，对实验结果进行了分析，并推导了自旋保持长度的表达式，得出自旋保持长度lsf∝μ1/2，认为要实现上述实验设想，需要选用具有高迁移率的有机材料；在低温条件下进行测试；施加强磁场等。
4. 我们研究了有机电致发光器件在不同的驱动模式（直流电源驱动和交流电源
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驱动）下的老化过程，在相同的初始亮度(100cd/m)条件下，用交流电源驱动的器件的寿命（器件的亮度下降到初始值的一半所用的时间）远远大于用直流电源驱动的器件的寿命。我们又制作了单载流子器件（只传输空穴或电子的器件），并研究了这些器件的老化特性。证实了器件的亮度随工作时间的下降是由Alq+和rubrene+引起的。
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吉林大学博士学位论文
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