制备了以Ag/SAM/m-MTDATA为复合空穴注入层的NPB/Alq3双层异质结发光器件,研究了器件的性能并与传统的器件进行了对比.考察了银膜厚度的变化对器件性能的影响.研究了光谱窄化以及微腔效应对器件的影响.研究结果表明:在ITO表面制备4-FTP自组装单分子膜修饰的5 nm厚的金属银膜,可以在保持阳极透明性的基础上,增强空穴的注入,改善界面的形貌,进而提高器件性能.制备的ITO/Ag/SAM/m-MTDATA/NPB/Alq3/LiF/Al器件的启亮电压为4V,最大电流效率为6.9 cd/A,最大亮度为34 680 cd/m2(12 V);优于以ITO为阳极的对比器件(25 300 cd/m2@ 12 V).%A double layer NPB/Alq3 heterojunction organic light emitting device using Ag/4-FTP (SAM)/m-MTDATA as combined hole-injecting layer was fabricated. The device performance was studied and compared with the control device. The effect of the Ag layer thickness on the device performance is also investigated. The variation of the spectral narrowing and intensity enhancement can be explained with microcavity effects. The results revealed that indium tin oxide (ITO) anode modified with Ag(5 nm)/ 4-FTP(SAM) demonstrated good transparency, enhanced hole injection ability and smooth interface morphology, which result in an improved device performance. The highest luminance of 34 680 cd/m2 at 12 V and a luminous efficiency of 6. 9 cd/A were achieved for the device with the structure of ITO/Ag/4-FTP( SAM)/m-MTDATA/NPB/Alq3/LiF/Al. However, the control device showed 25 300 cd/m2 at the same bias.
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