Evaluating the application of grating structure in an OLED for light extraction
The periodical microstructure, such as a grating, is thought to be able to enhance the extraction of light in the OLED. The emitting efficiency of OLEDs with gratings was studied, including applying grating in the interface of ITO/Glass, PPV/PEDOT, or both. Taking the coherent effect of the grating into account only, contrary to expected, the results do not show significant enhancement of light extraction. As known, the gratings do help coupling the guided light out the waveguide. However, its whole all effect is not sufficient large to result in an obvious increasing of the extraction efficiency. The significant enhancement reported in literatures might be contributed to the light diffusion, an incoherent process, of the microstructure. Thus, to enhance the light extraction, the periodicity of the microstructure could not be an important factor, if not at all. This could help to significantly relief the difficulty of forming microstructure to extract light in an OLED.
Grating microstructure light extraction OLED
Zhenhua Yang Wenfeng Wang
Faculty of Physics & Electronics, Hubei University Youyi Avenue 368, Wuchang, Wuhan, China 430062
国际会议
China Display/Asia Display 2011(2011年中国显示/亚洲显示会议)
江苏昆山
英文
490-493
2011-11-07（万方平台首次上网日期，不代表论文的发表时间）