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《JOURNAL OF FUNCTIONAL MATERIALS AND DEVICES》 1997-02
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VOLTAGE CONTROLLED COLOR VARIABLE ORGANIC THIN FILM EL DEVICE

LIU Zugang, ZHAO Weiming, TANG Chunjiu, WANG Linjun, JIANG Xueyin, ZHANG Zhilin, XU Shaohong (School of Materials, Shanghai University, Jiading, Shanghai 201800)  
An organic thin film electroluminescen device emitting different color with different driven voltage has been fabricated The structure of the device is ITO/SA/PBD/Alq3/Al SA is a styrylphenylamine derivative and its full name is N (2 p methoxylphenyl) styryl N p methoxylphenyl benzeneamine SA can emit blue light with peak at 470nm Alq3 is a chelate of aluminum with three 8 hydroxylquinoline and emits green light at 520nm PBD, an oxadizole derivative, is used between SA layer and Alq3 layer to confine the emission both from SA and Alq3 The variation of electroluminescent spectrum with the voltage applied to device has been investigated It is found that the emission spectrum of the device is consist of two parts, one is blue emitted from SA, the orther is green emitted from Alq3 And the blue part increases with increase of the driven voltage An energy band model is established from the data of work function of the electrodes and the HOMO levels and LUMO levels of the organic materials The EL behavior of the device has been explained by the energy band model
【CateGory Index】: TN383.1
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