Organic semiconductor dyes have attracted high interest as laser gain media owing to their judicious features of solution processability, lightweight, high mechanical flexibility, high wavelength-tunability, and low-cost manufacture. In this work, fluorene-carbazolylstyryl hybrids are reported, SFCz and BSTFCz, as new solution processable organic semiconductor laser dyes to show high molar extinction coefficients (up to 1.98 × 105 dm3 mol−1 cm−1), high photoluminescence quantum yields (up to 81 ± 4%), high radiative decay constants (up to 1.24 × 109 s−1), and low film amplified spontaneous emission thresholds (down to 0.70 µJ cm−2). By using mixed-order distributed feedback laser structures, extremely low lasing threshold of 0.5 µJ cm−2 is achieved. To elucidate their electroluminescent properties, simple solution-processed organic light-emitting diodes based on the new materials are fabricated to show good external quantum efficiencies (2%) and high brightness (≈2800 cd m−2). The results indicate the ease in material synthesis and fabrication enabling solution-processed low-threshold lasing toward future injection laser.
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