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制备了基于Alq3的有机发光二极管,器件结构为ITO/NPB/Alq3/LiF/Al,并在不同温度测量了器件在不同偏压下传导电流与电致发光的磁场效应.在较大的磁场范围内,磁电导曲线基本服从B2/(|B|+B0)2规律.而在零场附近很小的磁场范围内,测量结果显示出奇特的超小磁场效应.考虑载流子自旋与有机分子中核自旋之间的超精细相互作用对载流子自旋的调控,可以对这种零场附近的超小磁场效应给出合理解释.
The organic light-emitting diode based on Alq3 was prepared and the device structure was ITO / NPB / Alq3 / LiF / Al. The magnetic field effect of conduction current and electroluminescence at different bias voltages was measured at different temperatures. The internal and the magnetic conductance curves basically obey the law of B2 / (| B | + B0) 2, while the measurement results show strange ultra-small magnetic field effect in the small magnetic field near zero field. Considering the relationship between carrier spin and organic The superfine interaction between the nuclear spins in the molecule regulates the spin-on of the carrier, which can give a reasonable explanation for the ultra-small magnetic field effect near this zero-field.