Photoconversion of 6,13-α-diketopentacene single crystals exhibiting light intensity-dependent morphological change
Photoconversion of 6,13-α-diketopentacene single crystals exhibiting light intensity-dependent morphological change
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6,13-α-二酮并五苯单晶的光转换表现出光强度依赖性形态变化
DOI：
10.1039/c8cp06594b
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发表时间：
2019
影响因子：
3.3
通讯作者：
Masuo Sadahiro
中科院分区：
文献类型：
--
作者：
Yamauchi Mitsuaki;Miyamoto Yuya;Suzuki Mitsuharu;Yamada Hiroko;Masuo Sadahiro
最近，我们发现，6，13-二氢-6，13-乙并五苯-15，16-二酮（PDK）可以定量光转化为并五苯，即使在晶体相，伴随着破坏的晶体。在这项工作中，我们研究了光诱导的形态变化和光强度之间的关系的光转换在一个单一的微米级的晶体水平。强强度（超过100 kW cm−2）的光辐射导致在单晶中形成空穴。当中等强度（0.5-100 kW cm-2）照射时，观察到包括晶体分离和跳跃的破坏。单晶的吸收光谱测量表明，当生成几乎相同数量的并五苯时，由于不同分子之间的堆叠失配，晶体内产生的应变引起破坏。在以低强度（低于0.5kW cm-2）进行光照射时，在晶体表面上观察到突出的柱状物。这种形成是通过应变松弛的分子表面运动的结果。我们的研究结果提供了重要的洞察刺激响应晶体材料，并可能有助于远程可控智能材料的产生和应用。
Recently, we revealed that 6,13-dihydro-6,13-ethanopentacene-15,16-dione (PDK) could be quantitatively photoconverted into pentacene even in the crystal phase, accompanied by the destruction of the crystals. In this work, we investigated the relationship between the photoinduced morphological changes and the light intensity for the photoconversion at a single micrometre-sized crystal level. Photoirradiation with a strong intensity (over 100 kW cm−2) resulted in hole formation in a single crystal. When medium intensity (0.5–100 kW cm−2) was irradiated, destruction including separation and jumping of the crystal was observed. Absorption spectrum measurement of the single crystal revealed that when almost same number of pentacene was generated, the destruction was induced by the generated strain within crystal due to the stacking mismatch between the different molecules. Upon photoirradiation with a low intensity (below 0.5 kW cm−2), protruding pillar objects were observed on the crystal surface. This formation is a result of the surface movement of molecules through the relaxation of strain. Our results provide important insight into stimuli-responsive crystal materials and could contribute to the generation and application of remotely controllable smart materials.