Abstract：A new structure with Ⅱ-Ⅵ nano-crystal ZnO film as the electron transport layer and MEH-PPV as the hole transport layer and emitting layer was fabricated. The new structure’s brightness and efficiency were improved markedly compared with that of the single MEH-PPV layer structure. And a new peak at 620 nm was found in the ITO／MEH-PPV／ZnO／Al structure’s electroluminescence spectrum, which shoｕld resｕlted from ZnO layer. In addition, the turning-on voltage of the two-layer structure decreased from 9 V of the single layer structure to 4 V. From the I-V curve, the authors concluded that the emitting area was around the interface of MEH-PPV／ZnO and the combination area coｕld shift with chanｇinｇ the voltage.
[1] Greenham N C, Moratti S C, Bradley D D et al. Nature，1993, 365: 628. [2] Tang C W, Vanslyke S A, Chen C H et al. J. Appl. Phys., 1989, 65(9): 3610. [3] WANG Wei, DING Xiao-ping, MENG Guang-zheng(王 薇, 丁小平，孟广政). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2000, 20(2): 219. [4] Colvin V L, Schlamp M C, Alivisatos A P et al. Nature，1994，370：354. [5] TENG Fenｇ，YANG Ｘiao-hｕi，ＸU Zheng et al(滕 枫，杨晓辉，徐 征等). Chinese Journal of Luminescence(发光学报)，1997，18：348. [6] TENG Fenｇ，YANG Ｘiao-hｕi，ＸU Zheng et al(滕 枫，杨晓辉，徐征 等). Journal of Functional Materials(功能材料)，1998，29：543. [7] LI Jian-hong, QU Shu, XU Xue-mei，PENG Jing-cui(李宏建，瞿 述，许雪梅，彭景翠). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2002, 22(3): 360. [8] Young Kwan Kim, Kwaung Youn Lee et al. Synthetic Metals，2000，111-112：207. [9] Huang J M, Yang Y, Liu S Y et al. Appl. Phys. Lett.，1997，70：2335. [10] Spanhel Lubomir et al. J. Am. Chem. Soc.，1991，113：2826. [11] Brus L E. J. Chem. Phys.，1986，90：2555. [12] Brus L E. J. Chem. Phys.，1983, 79(11)：5566. [13] Brus L E. J. Nanostruct. Mater.，1992，(1)：71. [14] Wilson W L. Science，1993, 262：1242.
