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科学通报  2012 

器件老化处理对有机发光磁效应的影响

DOI: 10.1360/972011-2547, PP. 1100-1105

Keywords: 老化处理,有机磁效应,Alq3,阳离子,界面退化

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Abstract:

制备了基于小分子tris-(8-hydroxyquinoline)aluminum(III)(Alq3)的有机发光二极管,并在室温下对器件进行大电流老化处理;然后测量了器件的光电性能,以及电致发光磁效应(magneto-electroluminescence,MEL)随老化时间的变化关系.实验结果显示,经老化处理后,器件的发光效率降低、工作电压增大;但器件的MEL随老化时间则表现出先增加、后减小的特点,且其线型保持不变.基于器件光电性能退化的主要机制,分析了器件MEL发生非单调变化的可能原因,即器件中形成了对发光激子有淬灭作用的Alq3阳离子,该阳离子引起发光强度的减弱造成MEL在短时间处理后增加,而阴极/Alq3界面的退化导致发光层中电场的增大则引起器件MEL的减小.这对理解有机发光的退化机制和有机磁效应的形成机制具有较好的促进作用.

References

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[2]  Kalinowski J, Cocchi M, Virgili D P, et al. Magnetic field effects on emission and current in Alq3-based lectroluminescent diodes. Chem Phys Lett, 2003, 380: 710-715
[3]  Davis A H, Bussmann K. Large magnetic field effects in organic light emitting diodes based on tris(8-hydroxyquinoline aluminum) (Alq3)/N,N′-Di(naphthalene-1-yl)-N,N′-diphenyl-benzidine (NPB) bilayers. J Vac Sci Tech A, 2004, 22: 1885-1891
[4]  Hu B, Yan L, Shao M. Magnetic field effect in organic semiconducting materials and devices. Adv Mater, 2009, 21: 1500-1516
[5]  Lei Y L, Zhang Y, Liu R, et al. Driving current and temperature dependent magnetic-field modulated electroluminescence in Alq3-based organic light emitting diode. Org Electron, 2009, 10: 889-894
[6]  Zhang Q M, Lei Y L, Xiong Z H, et al. Positive and negative components of magneto-conductance in hole transport limited organic light-emitting diodes. Appl Phys Lett, 2011, 98: 243303
[7]  Chen P, Lei Y L, Xiong Z H, et al. Magnetoelectroluminescence in tris-(8-hydroxyquinoline) aluminum (III)-based organic light-emitting diodes doped with fluorescent dyes. Appl Phys Lett, 2009, 95: 213304
[8]  张巧明, 陈平, 雷衍连, 等. 非平衡注入对掺杂型有机发光二极管中磁电导效应的影响. 中国科学: 物理学 力学 天文学, 2010, 40:1507-1513
[9]  Francis T L, Mermer O, Veeraraghavan G, et al. Lagre magnetoresistance at room temperature in semiconducting polymer sandwich devices. New J Phys, 2004, 6: 185
[10]  Yahiro M, Zou D C, Tsutsui T, et al. Recoverable degradation phenomena of quantum efficiency in organic EL devices[J].Synth Met.2000,111-112:245-247
[11]  Niedermeier U, Vieth M, Patzold R, et al. Enhancement of organic magnetoresistance by electrical conditioning. Appl Phys Lett, 2008, 92:193309
[12]  Bagnich S, Niedermeier U, Melzer C, et al. Origin of magnetic field effect enhancement by electrical stress in organic light emitting diodes. J Appl Phys, 2009, 105: 123706
[13]  Franky S, Denis K. Degradation mechanisms in small-molecule and polymer organic light-emitting diodes. Adv Mater, 2010, 22:3762-3777
[14]  Aziz H, Popovic Z D, Hu N X, et al. Degradation mechanism of small molecule-based organic light-emitting devices. Science, 1999, 283:1900-1902
[15]  Kim S, Hsu C, Zhang C, et al. Degradation of PLEDs and a way to improve device performances. J Soc Inf Disp, 2004, 5: 14-17

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