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Monodisperse Six‐Armed Starbursts based on Truxene‐Cored Multibranched Oligofluorenes: Design, Synthesis, and Stabilized Lasing Characteristics
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2019-02-13 , DOI: 10.1002/chem.201805813 Hao Zhang 1 , Xu Liu 1 , Ting‐Ting Lu 1 , Peng Lv 1 , Wen‐Yong Lai 1
Chemistry - A European Journal ( IF 3.9 ) Pub Date : 2019-02-13 , DOI: 10.1002/chem.201805813 Hao Zhang 1 , Xu Liu 1 , Ting‐Ting Lu 1 , Peng Lv 1 , Wen‐Yong Lai 1
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A series of monodisperse six‐armed conjugated starbursts (Tr1F, Tr2F, and Tr3F) containing a truxene core and multibranched oligofluorene bridges capped with diphenylamine (DPA) units has been designed, synthesized, and investigated as robust gain media for organic semiconductor lasers (OSLs). The influence of electron‐rich DPA end groups on their optoelectronic characteristics has been discussed at length. DPA cappers effectively raise HOMO levels of the starbursts, thus enhancing the hole injection and transport ability. Solution‐processed electroluminescence devices based on the resulting six‐armed starbursts exhibited efficient deep‐blue electroluminescence with clear reduced turn‐on voltages (3.2–3.5 V). Moreover, the resulting six‐armed molecules showed stabilized electroluminescence and amplified spontaneous emission with low thresholds (27.4–63.9 nJ pulse−1), high net gain coefficients (80.1–101.3 cm−1), and small optical loss (2.6–4.4 cm−1). Distributed feedback OSLs made from Tr3F exhibited a low lasing threshold of 0.31 kW cm−2 (at 465 nm). The results suggest that the construction of truxene‐centered six‐armed conjugated starbursts with the incorporation of DPA units can effectively enhance EL properties by precisely regulating the HOMO energy levels, and further optimizing their optical gain properties.
中文翻译：
基于Truxene芯多支低聚芴的单分散六臂星爆：设计，合成和稳定的激光特性
一系列单分散六臂共轭星爆（Tr1F，Tr2F和Tr3F已经设计，合成并研究了含有戊二烯核和多支化二苯胺（DPA）单元的多支低聚芴桥作为有机半导体激光器（OSL）的稳健增益介质的技术。详细讨论了富电子的DPA端基对其光电特性的影响。DPA封盖机可有效提高星爆的HOMO水平，从而增强空穴注入和传输能力。基于产生的六臂星爆的固溶处理电致发光器件显示出有效的深蓝色电致发光，且开启电压明显降低（3.2–3.5 V）。此外，得到的六臂分子显示出稳定的电致发光和自发发射，且阈值较低（27.4–63.9 nJ脉冲-1），较高的净增益系数（80.1–101.3 cm -1）和较小的光学损耗（2.6–4.4 cm -1）。从由分布反馈OSLs Tr3F表现出0.31千瓦厘米的低激光阈值-2（在465纳米）。结果表明，以Dux单元为中心的以丁烯为中心的六臂共轭星爆的构造可通过精确调节HOMO能级并进一步优化其光学增益特性来有效增强EL特性。
更新日期：2019-02-13
中文翻译：
基于Truxene芯多支低聚芴的单分散六臂星爆：设计，合成和稳定的激光特性
一系列单分散六臂共轭星爆（Tr1F，Tr2F和Tr3F已经设计，合成并研究了含有戊二烯核和多支化二苯胺（DPA）单元的多支低聚芴桥作为有机半导体激光器（OSL）的稳健增益介质的技术。详细讨论了富电子的DPA端基对其光电特性的影响。DPA封盖机可有效提高星爆的HOMO水平，从而增强空穴注入和传输能力。基于产生的六臂星爆的固溶处理电致发光器件显示出有效的深蓝色电致发光，且开启电压明显降低（3.2–3.5 V）。此外，得到的六臂分子显示出稳定的电致发光和自发发射，且阈值较低（27.4–63.9 nJ脉冲-1），较高的净增益系数（80.1–101.3 cm -1）和较小的光学损耗（2.6–4.4 cm -1）。从由分布反馈OSLs Tr3F表现出0.31千瓦厘米的低激光阈值-2（在465纳米）。结果表明，以Dux单元为中心的以丁烯为中心的六臂共轭星爆的构造可通过精确调节HOMO能级并进一步优化其光学增益特性来有效增强EL特性。
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