Spatially indirect excitons as primary photoexcitations in conjugated polymers
- 14 February 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 72 (7) , 1104-1107
- https://doi.org/10.1103/physrevlett.72.1104
Abstract
We observe competition between picosecond photoinduced absorption and stimulated emission in poly(paraphenylenevinylene) which demonstrates that they derive from two different pathways. We conclude that the photoinduced absorption originates from nonemissive ‘‘spatially indirect’’ singlet excitons which are formed with quantum yield as high as 0.9. Previous arguments about maximum possible electroluminescence device efficiencies and about lasers in conjugated polymer films are reexamined in light of the prevalence of this species.Keywords
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