Color Characterization of ZnS:Mn/SrS:Ce Electroluminescent Devices Designed by Optical Simulation

摘要

The red/green/blue multicolor electroluminescent device designed by "color by white" approach is optically analyzed in terms of luminance and color characteristics. It is clarified that the white luminance is incidentally reduced down to 35% of the original intensity by replacing the rear electrode with lower reflectance materials. However, the device with a low-reflectance electrode exhibits excellent properties concerning the viewing angle dependence and the change of optical constants in the insulating layer. It is worthy to note that the key material to determine the visual quality of the display is not a blue phosphor but a red one. Furthermore, a theoretical model has been investigated with the ability to simulate the color difference, outcoupling efficiency and contrast ratio in order for the discussion of visual performance.