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采用具有单重态激子裂变(Singlet Exciton Fission,即STT过程)的红荧烯(Rubrene)作为发光层制备了有机发光器件,并在不同温度下(15KT300K)研究了器件发光随外加磁场的变化(即Magneto-Electro Luminescence,MEL).实验发现,与不具有STT过程的参考器件相比,Rubrene器件的MEL无论是在线型还是在幅度方面都表现出了新现象:室温下参考器件的MEL主要表现为低磁场下的快速上升和高磁场下缓慢增加直至逐渐饱和的特点,但Rubrene器件MEL的低磁场部分受到很大抑制且其高磁场部分一直增加而没有表现出饱和迹象,其线型也有很大不同;另外,这些特性受温度的影响较大,其光谱随温度的降低还出现了红移.通过对磁场作用下器件的超精细相互作用、STT过程和三重态激子湮灭过程(Triplet-Triplet Annihilation,TTA)以及这些微观过程温度效应的综合分析,认为室温300K下器件的MEL可用超精细相互作用和STT过程来解释,低温15K下器件的MEL则是超精细相互作用与TTA作用叠加的结果.
Organic light-emitting devices were prepared by using rubrene with singlet exciton fission (STT) as the light-emitting layer. The changes of the device luminescence with the applied magnetic field were investigated at different temperatures (15KT300K) (Ie, Magneto-Electro Luminescence, MEL). The experimental results show that the MEL of Rubrene devices shows a new phenomenon both in line and in amplitude, compared with the reference device without STT process: MEL at room temperature It shows the rapid increase in low magnetic field and the slow increase in high magnetic field until it is gradually saturated. However, the low magnetic field part of Rubrene device MEL is greatly suppressed and its high magnetic field part is always increasing without showing signs of saturation. In addition, these properties are greatly affected by temperature, and their spectra appear red-shifted with decreasing temperature.Through the superfine interaction of the device under the action of magnetic field, the STT process and the Triplet exciton annihilation process (Triplet -Triplet Annihilation, TTA) as well as the temperature effects of these microscopic processes, it is considered that the MEL of the device at room temperature 300K can be used to superfine interaction and STT Explained, MEL device at a low temperature is 15K hyperfine interaction with the superimposed effect of TTA results.