金、银混合纳米颗粒的LSPR效应对白光OLED电致发光性能的影响

Effects of LSPR of Au/Ag Mixed Nanoparticles on the Electroluminescence of White Organic Light Emitting Diode

研究了金、银纳米颗粒(Au NPs和Ag NPs)及其混合颗粒位于空穴注入层3,4-乙烯二氧噻吩聚合物聚苯乙烯磺酸盐(PEDOT:PSS)之下时,其产生的局域表面等离子体共振效应(LSPR)对白光有机电致发光器件(WOLED)的电致发光(EL)性能的影响。WOLED器件的结构是氧化铟锡(ITO)/Ag NPs(Au NPs)/PEDOT:PSS/4,4′-环己基二[N,N-二(4-甲基苯基)苯胺](TAPC)/4,4',4''-三(咔唑-9-基)三苯胺(TCTA)/1,3-二-9-咔唑基苯(mCP):FIrpic(质量分数8%)/Ir(piq)2acac/TPBi/LiF/Al。结果表明:Au NPs和Ag NPs都能提高WOLED器件的外部量子效率(EQE)和功率效率(PE),引入两者的混合颗粒后,器件的EQE和PE会得到进一步的提高。在Au NPs与Ag NPs溶液的最优体积比3∶1条件下,WOLED器件的EQE和PE分别为15.19%和15.03 lm/W,相比于原器件,WOLED器件的EQE和PE分别提高了29.06%和23.00%。通过激子动力学研究,揭示了LSPR效应及Au NPs和Ag NPs的加入比例对EL性能影响的内在机制。

The electroluminescence(EL)properties of white organic light-emitting diode(OLED)incorporating Au NPs,Ag NPs and their mixed nanoparticles(NPs)under the PEDOT:PSS hole injection layer(HIL)was studied,and a surface plasmon-enhanced EL efficiency was demonstrated.The EL properties of the OLED samples with either Ag NPs or Au NPs were better than those without metallic nanoparticles(MNPs).The OLEDs with mixed NPs with a volume ratio of 3∶1(Au NPs to Ag NPs)showed the best EL properties with an external quantum efficiency(EQE)of 15.19%and a power efficiency(PE)of 15.03 lm/W,which,compared to those without MNPs,were improved by 29.06%and 23.00%,respectively.The impacts of localized surface plasmon resonance(LSPR)of the MNPs on their EL properties were discussed.The internal mechanism of LSPR and the effect of Au NPs and Ag NPs addition ratio on EL performance were revealed by exciton dynamics study.