Tricolor microcavity OLEDs based on P-nc-Si：H films as the complex anodes

• Published in: Journal of semiconductors 2009-06, Vol.30 (6), p.42-47
• Main Author: 李阳 刘星元 吴春亚 孟志国 王忆 熊绍珍
• Format: Article
• Language: English
• Subjects: MOLED; Si; 强流电子束; 微腔结构; 数控; 有机发光二极管; 纳米硅薄膜; 阳极
• ISSN: 1674-4926
• DOI: 10.1088/1674-4926/30/6/063005

A P^＋-nc-Si：H film（boron-doped nc-Si：H thin film） was used as a complex anode of an OLED.As an ideal candidate for the composite anode,the P^＋-nc-Si：H thin film has a good conductivity with a high work function（- 5.7 eV） and outstanding optical properties of high reflectivity,transmission,and a very low absorption.As a result,the combination of the relatively high reflectivity of a P^＋-nc-Si：H film/ITO complex anode with the very high reflectivity of an Al cathode could form a micro-cavity structure with a certain Q to improve the efficiency of the OLED fabricated on it.An RGB pixel generated by microcavity OLEDs is beneficial for both the reduction of the light loss and the improvement of the color purity and the efficiency.The small molecule Alq would be useful for the emitting light layer（EML） of the MOLED,and the P^＋-nc-Si film would be used as a complex anode of the MOLED,whose configuration can be constructed as Glass/LTO/P^＋-nc-Si：H/ITO/MoO3/NPB/Alq/LiF/Al.By adjusting the thickness of the organic layer NPB/Alq,the optical length of the microcavity and the REB colors of the device can be obtained.The peak wavelengths of an OLED are located at 486,550,and 608 nm,respectively.The CIE coordinates are（0.21,0.45）,（0.33,0.63）,and（0.54,0.54）,and the full widths at half maximum（FWHM） are 35,32,and 39 nm for red,green,and blue,respectively.