High contrast mechanochromic and thermochromic luminescence switching by a deep red emitting organic crystal†,CrystEngComm

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High contrast mechanochromic and thermochromic luminescence switching by a deep red emitting organic crystal†
CrystEngComm ( IF 2.6 ) Pub Date : 2018-06-26 00:00:00 , DOI: 10.1039/c8ce00696b
Manas K. Panda _{1,

2,

3,

4,

5} , Nayana Ravi _{1,

2,

3,

4,

5} , P. Asha _{4,

5,

6,

7} , A. P. Prakasham _{5,

8,

9,

10}

Affiliation

In this study, we report a deep red emissive organic crystal that displays high contrast fluorescence switching under mechanical and thermal stimulation. Upon mechanical grinding, the pristine red emissive crystals of 1R (λ_em = 667 nm) transformed into green emissive crystalline powder (λ_em = 550 nm) with a remarkable hypsochromic shift of wavelength, Δλ = 117 nm. The melting of 1R leads to a green emissive amorphous solid (λ_em = 555 nm) with a wavelength shift of Δλ = 112 nm. Upon fuming with different solvents, the amorphous melt solid transforms into different polymorphs having distinct emission characters. The structural relationship between different emissive states is investigated with the aid of X-ray diffraction and other spectroscopic studies, which clearly demonstrate the roles of ordered molecular packing and intermolecular interaction in determining their diverse optical response.

中文翻译：

通过深红色发射有机晶体进行高对比度的机械变色和热致变色发光切换†

在这项研究中，我们报告了一种深红色发射有机晶体，在机械和热刺激下显示出高对比度的荧光切换。一旦机械研磨，原始红的发光晶体1R（λ _EM = 667纳米）变换成绿色发光的结晶性粉末（λ _EM = 550纳米）与波长，Δ的一个显着的蓝移λ = 117纳米。的熔化1R通向绿色发光无定形固体（λ _EM = 555纳米）与Δ的波长偏移λ= 112 nm。当用不同的溶剂发烟时，无定形的熔融固体转变成具有不同发射特性的不同的多晶型物。借助X射线衍射和其他光谱研究研究了不同发射态之间的结构关系，这些研究清楚地证明了有序分子堆积和分子间相互作用在确定其不同的光学响应中的作用。

更新日期：2018-06-26

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