New possibilities for light-emitting plastics with patterned light | 2/13/2019 | Staff
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Light-emitting plastics are used today in television and smartphone displays, light-emitting indicators and as illumination for cars and aircraft with special demands. The knowledge about how light is created and affected within the light sources is, however, comparatively limited.

In his thesis, Ph. D. candidate Mattias Lindh, who has studied the operation of light-emitting electrochemical cells, shows that the precise thickness of a film of light-emitting plastics is decisive for how bright and efficient the light sources will be. Reflections within the light sources give rise to interference—that is, light waves that interact with each other and can enhance or decrease the intensity, This interference is affected by the thickness of the film. To develop bright, efficient devices, the film's thickness should be controlled to optimize a system in which the light waves interfere constructively.

Sources - Name - Cells - Criteria - Time

"The unique light sources we work with, which have the complicated name 'light-emitting electrochemical cells,' are very well suited to fulfill these criteria, and at the same time, the fabrication can be cost-effective and environmentally friendly," says Lindh, a student at the Department of Physics at Umeå University.

But there are also other loss channels in the light sources, and computer simulations can reveal these loss channels. From the simulation results, Lindh has suggested a number of ways to design future optimized light sources that deliver maximum brightness with high efficiency. "For example, it is possible to change the...
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