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A luminescent lyotropic liquid crystal with UV irradiation induced photochromism.
Soft Matter ( IF 2.9 ) Pub Date : 2020-01-14 , DOI: 10.1039/c9sm02366f Qingrun Li 1 , Juan Qiu , Hongguo Liu , Xiao Chen
Soft Matter ( IF 2.9 ) Pub Date : 2020-01-14 , DOI: 10.1039/c9sm02366f Qingrun Li 1 , Juan Qiu , Hongguo Liu , Xiao Chen
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Multicolored photoluminescence induced by UV irradiation in soft materials has invaluable potential in display and detection applications. Here, an ionic liquid (ethylammonium nitrate, EAN)-mediated luminescent lyotropic liquid crystal (LLC) has been fabricated, where an europium complex with two ligands (Eu(DBM)3BQ, DBM = dibenzoylmethane and BQ = 2,2'-biquinoline) was doped. The obtained LLC exhibited enhanced fluorescence intensity and lifetime compared to those of Eu(DBM)3BQ in EAN solution. Interestingly, the luminescent LLC color from the initial red emission of the complex was changed gradually to green when the UV exposure was extended. Though the DBM ligand displayed the typical photo-degradation, the emission intensity of BQ increased drastically. A mechanism based on an UV-induced trans-to-cis isomerization of BQ was proposed to explain such an unusual luminescence phenomenon. Both the experimental and computational results indicated an intra ligand charge transfer (ILCT) accompanied with the BQ isomerization under continuous UV irradiation, which resulted in the enhanced green light emission. The results obtained here are referable for better understanding the interplay between weak interactions and modulation of novel lanthanide-based photochromism systems under UV exposure.
中文翻译：
具有紫外线照射的发光溶致液晶引起光致变色。
紫外线在软性材料中引发的彩色光致发光在显示和检测应用中具有巨大的潜力。在这里，已经制备了离子液体（硝酸乙基铵，EAN）介导的发光溶致液晶（LLC），其中带有两个配体的（络合物（Eu（DBM）3BQ，DBM =二苯甲酰甲烷，BQ = 2,2'-联喹啉）被掺杂。与EAN溶液中的Eu（DBM）3BQ相比，所获得的LLC具有增强的荧光强度和寿命。有趣的是，当紫外线暴露延长时，从配合物最初的红色发射发出的发光LLC颜色逐渐变为绿色。尽管DBM配体表现出典型的光降解作用，但BQ的发射强度却急剧增加。有人提出了一种基于紫外线诱导的BQ反式-顺式异构化的机理来解释这种异常的发光现象。实验和计算结果均表明，在连续紫外线照射下，配体内部电荷转移（ILCT）伴随BQ异构化，导致增强的绿光发射。这里获得的结果对于更好地理解弱相互作用与新型镧系光致变色体系在紫外线下的调制之间的相互作用具有参考作用。
更新日期：2020-02-13
中文翻译：
具有紫外线照射的发光溶致液晶引起光致变色。
紫外线在软性材料中引发的彩色光致发光在显示和检测应用中具有巨大的潜力。在这里，已经制备了离子液体（硝酸乙基铵，EAN）介导的发光溶致液晶（LLC），其中带有两个配体的（络合物（Eu（DBM）3BQ，DBM =二苯甲酰甲烷，BQ = 2,2'-联喹啉）被掺杂。与EAN溶液中的Eu（DBM）3BQ相比，所获得的LLC具有增强的荧光强度和寿命。有趣的是，当紫外线暴露延长时，从配合物最初的红色发射发出的发光LLC颜色逐渐变为绿色。尽管DBM配体表现出典型的光降解作用，但BQ的发射强度却急剧增加。有人提出了一种基于紫外线诱导的BQ反式-顺式异构化的机理来解释这种异常的发光现象。实验和计算结果均表明，在连续紫外线照射下，配体内部电荷转移（ILCT）伴随BQ异构化，导致增强的绿光发射。这里获得的结果对于更好地理解弱相互作用与新型镧系光致变色体系在紫外线下的调制之间的相互作用具有参考作用。
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