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.

中文翻译：

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芴和乙烯基苯基咔唑杂化物的低放大自发发射和发射阈值

由于有机半导体染料具有溶液加工性，重量轻，机械柔韧性高，波长可调性高和制造成本低等明智特征，因此作为激光增益介质引起了人们的极大兴趣。在这项工作中，报告了芴-咔唑基苯乙烯基杂化物SFCz和BSTFCz，它们是可溶液加工的新型有机半导体激光染料，具有高的消光系数（高达1.98×10 ⁵ dm ³ mol ^-1 cm ^-1），具有高的光致发光量子产率（高达81±4％），高辐射衰减常数（高达1.24×10 ⁹ s ^-1）和低膜放大的自发发射阈值（低至0.70 µJ cm ^-2））。通过使用混合阶分布反馈激光结构，可以实现极低的0.5 µJ cm ^-2的激光阈值。为了阐明其电致发光特性，制造了一种基于新材料的简单溶液处理有机发光二极管，以显示出良好的外部量子效率（2％）和高亮度（≈2800cd m ^-2）。结果表明，材料合成和制造的简便性使得解决方案加工的低阈值激光可用于未来的注入激光。