采用低电阻率的Ta2O5／SiO2、Ta2O5／Al2O3复合层制备出低压驱动ZnS：Mn薄膜电致发光器件，它的阈值电压在40V以下。当驱动电压为60V、频率为50Hz时，发光亮度在200cd／m2以上。这种器件具有其独特的亮度-电压特性和电荷存储量-电压特性。利用空间电荷限制电流模型分析了发光层中空间电荷、电场强度在这种低压驱动电致发光器件发光层中的分布特性，并对低压驱动薄膜电致发光机理、亮度-电压特性、电荷存储量-电压特性进行了解释。分析表明复合层的电导性质是获得低压驱动电致发光器件的关键。 The low voltage driven Ta 2 O 5 / SiO 2 and Ta 2 O 5 / Al 2 O 3 composite layers were used to fabricate the low voltage driven ZnS: Mn thin film electroluminescent device. Its threshold voltage was under 40V. When the drive voltage is 60V, the frequency of 50Hz, the light emission brightness of 200cd / m2 or more. This device has its unique brightness - voltage characteristics and charge storage - voltage characteristics. The space charge-limited current model was used to analyze the distribution characteristics of the space charge and electric field in the light-emitting layer of low-voltage driving electroluminescent device. The effects of low-voltage driving electroluminescence, brightness-voltage characteristics, charge storage - Voltage characteristics are explained. The analysis shows that the conductivity of the composite layer is the key to obtain low-voltage driving electroluminescent device.