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在poly[{9,9-dioctyl-2,7-divinylenefluorenylene)-alto-co-(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylene}](PFOPV)发光材料中同时存在激子态和电荷转移态的辐射退激过程.本文制备了基于PFOPV的发光器件,并以发光和电流的磁场效应为手段研究了这2种发光过程的微观差异.实验发现,在室温下,载流子注入平衡器件的磁电致发光表现为负效应,而非平衡器件的磁电致发光表现正效应;低温下,平衡器件的磁电致发光会随着注入电流的增加出现由负到正的转变,但磁电导却始终呈现为负值.磁效应与载流子注入情况、温度和注入电流的这些依赖关系可归结为两发光过程在器件中相互竞争的结果.分析表明两过程磁效应的差异是由超精细相互作用诱导的系间窜越和反系间窜越作用共同引起的.本研究工作证明了电荷转移态对提高荧光有机发光器件的发光效率具有重要的参考价值.
In the presence of a concurrent excitation of poly [{9,9-dioctyl-2,7-divinylenefluorenylene) -alto-co- (PFOPV) Sub-state and charge-transfer state of the radiation annealing process.In this paper, a light-emitting device based on PFOPV was prepared and the microscopic differences of these two kinds of light-emitting processes were studied by means of the light-emitting and current magnetic field effects.It was found that at room temperature, Magneto-luminescence of a balanced-injection device shows a negative effect, whereas that of a non-balanced device shows a positive effect. At low temperatures, the magneto-electroluminescence of the balanced device appears negative to positive as the injection current increases , But the magnetic conductance always assumes a negative value.The dependence of these magnetic effects on the carrier injection, the temperature and the injection current can be attributed to the mutual competition of the two emission processes in the device.The analysis shows that the two-process magnetic effect Is caused by the superfine interaction induced by intersystem crossing and the anti-intersystem crossing together.This research proves that the charge transfer state has important reference value for improving the luminescent efficiency of fluorescent organic light-emitting devices.