Abstract
We have successfully demonstrated a significant fluorescence property in an organic crystal made of a thiophene/phenylene co-oligomer called AC5. The crystal showed no non radiative transition, meaning it has 100% internal fluorescent quantum efficiency. The crystal also showed high quantum efficiency of photoluminescence of 23±1%. Furthermore, it showed an amplified spontaneous emission at a threshold energy of 21.3 µJ/cm2 and subsequently showed a quite high optical gain of 52.3 cm-1. These features are attractive in many areas in the organic optics field such as organic light emitting diodes, organic lasers, and so on.
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