[1] Kido J, Kimura M, Nagai K. Multilayer white light-emitting organic electroluminescent device ［J］. Science, 2005, 267 (5202):1332-1334.

[2] Xie X D, Hao Y Y, Zhang R G, et al. Lithium-doped tris(8-hydroxyquinoline) aluminum studied by density functional theory ［J］. Acta Phys. Sinica (物理学报), 2012, 61(12):127201-1-7 (in Chinese).

[3] Zhao Y B, Chen J S, Ma D G. Realization of high efficiency orange and white organic light emitting diodes by introducing an ultra-thin undoped orange emitting layer ［J］. Appl. Phys. Lett., 2011, 99(16):163303-1-3．

[4] Zhang S M, Chen Y, Wang X H, et al. White organic light-emitting diodes with high color rendering index using phosphorescent sensitizer and blue fluorescent emitter ［J］. Chin。 J. Lumin.(发光学报), 2012, 33(1):97-101 (in Chinese).

[5] Kamtekar K T, Monkman A P, Bryce M R. Recent advances in white organic light-emitting materials and devices (WOLEDs) ［J］. Adv. Mater., 2010, 22(5):572-582.

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

[7] Tang C W, Vanslyke S A, Chen C H. Electroluminescence of doped organic thin film ［J］. Appl. Phys., 1989, 65(9):3610-3616.

[8] 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.

[9] Choudhury K R, Yoon J H, So F. LiF as an n-dopant in tris(8-hydroxyquinoline) aluminum thin films ［J］. Adv. Mater., 2008, 20(8):1456-1461.

[10] Zhang R, Li C N, Li T, et al. Fabrication of inverted bottom organic light-emitting device with Li3N n-type doping electron injecting layer ［J］. Acta Photonica Sinica (光子学报), 2011, 40(2):199-203 (in Chinese).

[11] Li D, Kaner R B. Graphene-based materials ［J］. Science, 2008, 320(5880): 1170-1171.

[12] Park S, Ruoff R S. Chemical methods for the production of graphenes ［J］. Nature Nanotechnol., 2009, 4(4):217-224.

[13] Compton O C, Nguyen S T. Graphene oxide, highly reduced graphene oxide, and graphene:Versatile building blocks for carbon-based materials ［J］. Small, 2010, 6(6):711-723.

[14] Kim J, Cote L J, Kim F, et al. Graphene oxide sheets at interfaces ［J］. J. Am. Chem. Soc., 2010, 132(23):8180-8186.

[15] Kim J, Cote L J, Kim F, et al. Visualizing graphene based sheets by fluorescence quenching microscopy ［J］. J. Am. Chem. Soc., 2010, 132(1):260-267.

[16] Cote L J, Kim J, Zhang Z, et al. Tunable assembly of graphene oxide surfactant sheets: Wrinkles, overlaps and impacts on thin film properties ［J］. Soft Matter., 2010, 6(24):6096-6101.

[17] Tung V C, Kim J, Cote L J, et al. Sticky interconnect for solution-processed tandem solar cells ［J］. J. Am. Chem. Soc., 2011, 133(24):9262-9265.

[18] Kim K S, Zhao Y, Jang H, et al. Large-scale pattern growth of graphene films for stretchable transparent electrodes ［J］. Nature, 2009, 457(7230):706-710.

[19] Wu J B, Agrawal M, Becerril H A, et al. Organic light-emitting diodes on solution-processed graphene transparent electrodes ［J］. ACS Nano, 2010, 4(1):43-48.

[20] Liu Z F, Liu Q, Huang Y, et al. Organic photovoltaic devices based on a novel acceptor material:Graphene ［J］. Adv. Mater., 2008, 20(20):3924-3930.

[21] Daniela C M, Dmitry V K, Jacob M B, et al. Improved synthesis of graphene oxide ［J］. ACS Nano, 2010, 4(8):4806-4814.