Injection Lasers Fabricated From Semiconducting Polymers
University of California System: University of California, Santa Barbara
posted on 04/29/2009
Light-emissive polymers are outstanding laser materials because they are intrinsically “4-level” systems. Their luminescence efficiencies exceed 60%, even in undiluted films, they emit at colors in the full range of the visible spectrum, and they can be processed into optical quality films by spin casting. In recent years, remarkable progress has been made in implementing semiconducting polymer materials into different resonant structures for optically pumped lasers. Neat films with emission wavelengths ranging over the entire visible spectrum and high photo-luminescence illustrate the importance of this class of luminescent semiconducting polymers as gain media. Placing a thin film as the active material between two electrodes in a vertical cavity laser configuration offers one approach to injection lasers. However, electrically pumped laser emission has not yet been demonstrated due to the additional losses introduced by the metal electrodes and charge induced absorption.
This new UC invention has applications in fabricating organic injection lasers.
The new UC technology provides the following benefits:
- significantly reduces charge induced absorption losses;
- minimizes electrode interference with the guided wave.
Scientists at the University of California have developed a novel method to overcome the difficulties associated with the additional losses caused by the metal electrodes and charge induced absorption. A new architecture, called a light-emitting field effect transistor (LEFET) configuration, combines with injection-induced amplification of the “cut-off mode” to achieve gain narrowing and lasing.
File Number: 10269
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