[1] [1] Kondakov D Y, Sandifer J R, Tang C W, et al. Nonradiative recombination centers and electrical aging of organic light-emitting diodes: Direct connection between accumulation of trapped charge and luminance loss[J]. Journal of Applied Physics, 2002, 93(2): 1108-1119.

[3] [3] Kwon S K, Lee E H, Kim K S, et al. Efficient micro-cavity top emission OLED with optimized Mg: Ag ratio cathode[J]. Optics Express, 2017, 25(24): 29906.

[4] [4] Prache O. Full-color SVGA+ OLED-on-silicon microdisplay[J]. Journal of the Society for Information Display, 2012, 10(2): 133-138.

[5] [5] Shinar J, Shinar R. Organic light-emitting devices (OLEDs) and OLED-based chemical and biological sensors: an overview[J]. Journal of Physics D-applied Physics, 2008, 41(13): 133001-0.

[6] [6] XIE W F, Lau K C, Lee C S, et al. Transparent organic light-emitting devices with LiF/Yb:Ag cathode[J]. Thin Solid Films, 2007, 515(17): 6975-6977.

[7] [7] Miyagawa M, Koike R, Takahashi M, et al. Low work function MgAg-coated poly(ethylene terephthalate) films for organic light -emitting device fabrication with lamination process[J]. Japanese Journal of Applied Physics, 2007, 46(11): 7483-7486.

[8] [8] MA G L, RAN G Z, XU A G, et al. Novel transparent Yb-based cathodes for top-emitting organic light emitting devices with high performance[J]. Applied Surface Science, 2006, 252(10): 3580-3584.

[9] [9] WANG J, CHEN J, QIAO X, et al. Simple-structured phosphorescent warm white organic light-emitting diodes with high power efficiency and low efficiency roll-off[J]. ACS Applied Materials & Interfaces, 2016, 8(16): 10093-10097.

[10] [10] ZHANG T, ZHANG L, JI W, et al. Transparent white organic light-emitting devices with a LiF/Yb: Ag cathode[J]. Optics Letters, 2009, 34(8): 1174-1176.

[11] [11] Banerjee S, Chakravorty D. Optical absorption of composites of nanocrystalline silver prepared by electrodeposition[J]. Applied Physics Letters, 1998, 72(9): 1027-1029.