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采用脱氯化氢反应合成出氯仿可溶性的MEH PPV聚合物 ,用MEH PPV作为发光材料制备了单层结构ITO/MEH PPV/Al和双层结构ITO/MEH PPV/Alq3/Al电致发光器件 ,测量了器件的电致发光谱、I V特性和B V特性 .利用能级理论分析了器件的发光特性随器件结构的不同所具有的规律 .实验表明 ,单层结构器件和双层结构器件的发光出现在MEH PPV层 ,当加入Alq3电子传输层 /空穴阻挡层后 ,双层结构器件能在较小的电流密度下获得较高的发光亮度
A series of ITO / MEH PPV / Alq3 / Al electroluminescent devices with single-layer structure and two-layer ITO / MEH PPV / Alq3 / Al electroluminescent devices were prepared by dehydrochlorination reaction of chloroform-soluble MEH PPV polymer with MEH PPV as luminescent material. The device is characterized by its electroluminescence spectrum, IV characteristic and BV characteristic. The energy level theory is used to analyze the regularity of the luminescence properties of the devices with different device structures. The experimental results show that the luminescence of single-layer devices and double- PPV layer, when added to the Alq3 electron transport layer / hole-blocking layer, the double-layer structure device can achieve a higher luminance at a lower current density