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1.场致发光的基本现象及一般原理 (1)交流激发下的场致发光 用于交流激发的粉末场致发光材料主要是ZnS:Cu之类材料。 交流场致发光的亮度和所加电压的关系符合经验公式: B=B_0exp[-(V_0/V)~(1/2)] 其中B为亮度,V为外加电压,B_0和V_0为和电压无关的常数。从这个经验公式可以知道,亮度是随电压的增大超线性增加的。B_0和V_0与温度、电压的频率,所用的发光粉,发光屏的结构有关。频率越高,温度越
1. The basic phenomenon of electroluminescence and the general principles (1) electroluminescence under excitation electroluminescence excitation electroluminescent material is mainly ZnS: Cu and the like. The relationship between the electroluminescence luminescence and the applied voltage is in accordance with the empirical formula: B = B_0exp [- (V_0 / V) ~ (1/2)] where B is the brightness, V is the applied voltage, B_0 and V_0 are voltage independent Constant. From this empirical formula we can see that the brightness increases linearly with the increase of voltage. B_0 and V_0 with the temperature, voltage frequency, the use of luminescent powder, light-emitting screen structure. The higher the frequency, the more temperature