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制备了基于5,6,11,12-tetraphenylnaphthacene(Rubrene)的有机发光二极管,并测量器件在不同偏压与工作温度下电致发光的磁场效应(magneto-electroluminescence,MEL).实验发现:在室温下,MEL曲线在零磁场附近几毫特斯拉范围内为W线型;而当温度降低到75 K左右,该W线型消失,MEL却呈现出一种新的精细结构,即M型的超小场效应,这种演化过程在以前的文献中未见报道.分析表明:室温下MEL的W线型是极化子对(polaron pair,PP)的超精细相互作用和外磁场引起的塞曼作用对载流子自旋共同调控的结果;低温下MEL的M线型与三重态-三重态激子湮灭(triplet-triplet annihilation,TTA)过程相关,可以用零场劈裂与塞曼作用对三重态激子对(triplet pair state,(TT)i)演化过程的共同调控来解释.该发现不仅丰富了有机半导体中的磁现象,而且加深了对有机发光器件中激发态间自旋相互作用的认识.
The organic light-emitting diode based on 5,6,11,12-tetraphenylnaphthacene (Rubrene) was prepared and the magneto-electroluminescence (MEL) of the device was measured under different bias voltages and operating temperatures. It was found that at room temperature , The MEL curve is W-line within a few milliteslares near zero magnetic field. When the temperature drops to about 75 K, the W line disappears and MEL presents a new fine structure, namely, M-type Ultra-small field effect, which has not been reported in the previous literature, shows that W linear at room temperature is a hyperfine interaction of polaron pair (PP) and an external magnetic field-induced plug Mann’s effect on carrier spin co-regulation. The M-line type of MEL at low temperature is related to the triplet-triplet annihilation (TTA) process and can be explained by zero field splitting and Zeeman interaction Which is explained by the common regulation of the evolution process of triplet pair state (TT) i.The discovery not only enriches the magnetic phenomena in organic semiconductors, but also deepens the interaction between the excited states of the organic light emitting devices The role of understanding.