[1] Tang C W,VanSlyke S A. Organic electroluminescent diodes ［J］. Appl. Phys. Lett.,1987,51(12): 913-915.

[2] Chen Y,Zhao F,Zhao Y,et al. Ultra-simple hybrid white organic light-emitting diodes with high efficiency and CRI trade-off: Fabrication and emission-mechanism analysis ［J］. Org. Electron.,2012,13(12): 2807-2815.

[3] Gao Q,Yin Y M,Yu J,et al. High efficiency phosphorescent organic light emitting devices based on bipolar host ［J］. Chin. J. Lumin.(发光学报),2014,35(6): 717-721 (in Chinese).

[4] Liu J,Xie W F. Integrated optoelectronic performance test system for OLEDs ［J］. Chin. J. Liq. Cryst. Disp.(液晶与显示),2013,28(1): 132-137 (in Chinese).

[5] Ji Y C,Liu S H,Liu W B,et al. One-direction-emission red transparent organic light-emitting devices ［J］. Chin. J. Lumin.(发光学报),2014,35(11): 1354-1358 (in Chinese).

[6] Baldo M A,OBrien D F,You Y,et al. Highly efficient phosphorescent emission from organic electroluminescent devices ［J］. Nature,1998,395(6698): 151-154.

[7] Lee C J,Pode R B,Moon D G,et al. On the problem of microcavity effects on the top emitting OLED with semitransparent metal cathode ［J］. Phys. Stat. Sol.(a),2004,201(5): 1022-1028.

[8] Riel1 H,Karg S,Beierlein T,et al. Phosphorescent top-emitting organic light-emitting devices with improved light outcoupling ［J］. Appl. Phys. Lett.,2003,82(3): 466-468.

[9] Liu S H,Wen X M,Liu W B,et al. Angle-stable top-emitting white organic light-emitting devices employing a down-conversion layer ［J］. Curr. Appl. Phys.,2014,14(11): 1451-1454.

[10] Wang Q,Chen Y H,Chen J S,et al. White top-emitting organic light-emitting diodes employing tandemstructure ［J］. Appl. Phys. Lett.,2012,101(13): 133302-1-3.

[11] Liu W B,Liu S H,Yu J,et al. Efficient inverted organic light-emitting devices with self or intentionally Ag-doped interlayer modified cathode ［J］. Appl. Phys. Lett.,2014,104(9): 093305-1-3.

[12] Liu Y F,Feng J,Yin D,et al. Viewing-angle independence of white emission from microcavity top-emitting organic light-emitting devices with periodically and gradually changed cavity length ［J］. Org. Electron.,2013,14(6): 1597-1601.

[13] Freitag P,Reineke S,Olthof S,et al. White top-emitting organic light-emitting diodes with forward directed emission and high color quality ［J］. Org. Electron.,2010,11(10): 1676-1682.

[14] Xie G H,Zhang Z S,Xue Q,et al. Highly efficient top-emitting white organic light-emitting diodes with improved contrast and reduced angular dependence for active matrix displays ［J］. Org. Electron.,2010,11(12): 2055-2059.

[15] Xie J,Chen C Y,Chen S F,et al. Blue top-emitting organic light-emitting devices based on wide-angle interference enhancement and suppression of multiple-beam interference ［J］. Org. Electron.,2011,12(2): 322-328.

[16] Liu S,Liu W,Yu J,et al. Silver/germanium/silver: An effective transparent electrode for flexible organic light-emitting devices ［J］. J. Mater. Chem. C,2014,2(5): 835-840.

[17] Wang J,Ji W Y,Zhu H B,et al. Metal-anode-dependent spectra and efficiency in blue top-emitting organic light-emitting devices ［J］. Org. Electron.,2013,14(3): 723-729.

[18] Wang Y H,Cui H F,Zhang Y F,et al. Eliminate the angular dependence of blue emission top-emitting organic light-emitting devices by integrating gratings ［J］. Optik,2014,125(6): 1711-1714.

[19] Liu S,Liu J,Wen X,et al. Angle-stable RGBW top-emitting organic light-emitting devices with Ag/Ge/Ag cathode ［J］. Opt. Lett.,2013,38(10): 1742-1744.

[20] Wang J,Zhang F,Wang Y,et al. Emission colour-tunable phosphorescent organic light-emitting diodes based on the self-absorption effect and excimer emission ［J］. J. Phys. D: Appl. Phys.,2013,46 (1): 015104-1-6.

[21] Xie W F,Chen S F,Zhang L T,et al. Top-emitting organic light-emitting devices with different-thickness top silver cathodes ［J］. J. Phys. D: Appl. Phys.,2007,40(19): 5888-5891.