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考虑载流子经过体材料内部所受限制对Fowler-Nordheim隧穿电流密度的影响,建立了高电场下有机单层器件的复合发光模型,并求出了复合电流密度和复合效率以及电导率的数学表达式,很好地解释了电场强度对迁移率和复合区域的调制作用.载流子的平衡注入以及复合区域的尽可能靠近器件中部以减少漏电流,都是提高器件发光效率的重要条件.只有当电压增大到某一数值时,由于注入的载流子多于器件实际输运载流子的能力,才会出现空间电荷限制电流.
Considering the influence of the internal charge of the carrier on the Fowler-Nordheim tunneling current density, the composite luminescence model of the organic single-layer device under high electric field was established and the composite current density, recombination efficiency and conductivity Mathematical expressions provide a good explanation of the modulating effect of electric field on mobility and recombination regions.The balanced injection of carriers and the recombination region as close as possible to the middle of the device to reduce the leakage current are all important conditions for improving the device’s luminous efficiency Only when the voltage is increased to a certain value, the space charge limited current will appear due to the fact that more carriers are injected than the device actually carries carriers.