Highly Emissive Hierarchical Uniform Dialkylfluorene-Based Dimer Microcrystals for Ultraviolet Organic Laser,The Journal of Physical Chemistry C

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Highly Emissive Hierarchical Uniform Dialkylfluorene-Based Dimer Microcrystals for Ultraviolet Organic Laser
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2019-11-14 , DOI: 10.1021/acs.jpcc.9b07895
Wen-Sai Zhu ₁ , Ya-Min Han ₁ , Xiang An ₁ , Jie-Na Weng _{1,

2} , Meng-Na Yu ₃ , Lu-Bing Bai ₁ , Chuan-Xin Wei ₁ , Jin-Yi Lin _{1,

2} , Wei Liu ₄ , Chang-Jin Ou ₁ , Ling-Hai Xie _{2,

3} , Xue-Hua Ding ₁ , Jian-Feng Zhao ₁ , Chun-Xiang Xu ₄ , Wei Huang _{1,

2,

3}

Affiliation

The hierarchically uniform condensed structure of light-emitting conjugated molecules is an effective platform to obtain an excellent electronic landscape with little physical defect and further improve the photophysical property. Herein, a highly emissive dialkylfluorene-based dimer crystal structure is constructed with crystalline-enhanced emission for ultraviolet organic microlasers. Instable planar conformation of a fluorene dimer can be stabilized in a rigid crystalline framework, which is a fundamental factor to fabricate the hierarchically uniform structure (including planar conformational molecules and periodical molecular packing in the crystalline structure). Therefore, a high photoluminescence quantum efficiency of 50 and 75% is obtained for neat spin-coated films and single crystals, respectively, attributing to the little physical defect in this hierarchical oriented structure. This robust crystalline-enhanced emission enables their microcrystals to construct ultraviolet organic lasers (395 nm) with a low threshold of 7.65 × 10^–3 nJ cm^–2 pulse^–1, which is 4 times lower than that of the controlled trimer one (TDMeF). These observations reasonably confirm that the hierarchically ordered architecture of conjugated materials shows great promise in optoelectronic applications.

中文翻译：

紫外线有机激光的高发射分层均匀二烷基芴基二聚体微晶。

发光共轭分子的层次均匀的稠密结构是获得良好的电子景观而几乎没有物理缺陷并进一步改善光物理性质的有效平台。在此，构建了具有高发射性的基于二烷基芴的二聚体晶体结构，其具有用于紫外线有机微激光器的晶体增强的发射。芴二聚体的不稳定平面构象可以在刚性的晶体框架中稳定，这是制造分级均匀结构（包括晶体构象中的平面构象分子和周期性分子堆积）的基本因素。因此，对于纯净的旋涂膜和单晶，分别获得50和75％的高光致发光量子效率。归因于这种面向层次的结构中的微小物理缺陷。这种强大的晶体增强发射使其微晶能够构建具有7.65×10的低阈值的紫外有机激光器（395 nm）^–3 nJ cm ^–2脉冲^–1，比受控三极管（TDMeF）的脉冲低4倍。这些观察结果合理地证明，共轭材料的分层有序体系结构在光电应用中显示出巨大的希望。

更新日期：2019-11-14

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