. Yu W G, Xu Z, Teng F, et al. Blue electroluminescence of ZnSe thin film in an organic-inorganic heterostructures device [J]. Phys. Lett. A, 2005, 338 (5):402-406.

. Li F, Tang H, Anderegg J, et al. Fabrication and electroluminescence of double-layered organic light-emitting diodes with the Al2O3/Al cathode [J]. Appl. Phys. Lett., 1997, 70 (10):1233-1235.

. Lee J, Park Y, Kim D Y, et al. High efficiency organic light-emitting devices with Al/NaF cathode [J]. Appl. Phys. Lett., 2003, 82 (2):173-175.

. Zhu F R, Low B, Zhang K R, et al. Lithium-fluoride-modified indium tin oxide anode for enhanced carrier injection in phenyl-substituted polymer electroluminescent devices [J]. Appl. Phys. Lett., 2001, 79 (8):1205-1207.

. Li J, Yahiro M, Ishida K, et al. Enhanced performance of organic light emitting device by insertion of conducting/insulating WO3 anodic buffer layer [J]. Synthetic Metals, 2005, 151 (2):141-146.

. Kim Y M, Lee J W, Jung J H, et al. Enhanced brightness and efficiency of organic light-emitting diodes with an LiF in the Alq3 [J]. IEEE Electron Device Letters, 2006, 27 (7):558-561.

. Niu L B, Zhang F J. The effect of Al2O3 nanolayers on the efficiency of organic light-emitting devices [J]. Semicond. Sci. Technol., 2006, 21 (12):1639-1642.

. Brutting W, Berleb S, Muckl A G. Device physics of organic light emitting diodes based on molecular materials [J]. Org. Electron., 2001, 2 (1):1-5.

. Kim J H, Lee H. Efficient poly(p-phenylenevinylene) derivative with 1,2-diphenyl-2'-cyanoethene for single layer light-emitting diodes [J]. Synthetic Metals, 2003, 139 (4):471-474.

. Xu Z, Qu C, Teng F, et al. Why is the band model not contradictory to molecular theory in organic electroluminescence? [J]. Appl. Phys. Lett., 2005, 86 (6):061911-1-3.

. Dimitrakopoulos C D, Malenfant P R L. Organic thin film transistors for large area electronics [J]. Adv. Mater., 2002, 14 (2):99-117.