Use of silylmethoxy groups as inducers of efficient room temperature phosphorescence from precious-metal-free organic luminophores†,Materials Chemistry Frontiers

当前位置： X-MOL 学术 › Mater. Chem. Front. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Use of silylmethoxy groups as inducers of efficient room temperature phosphorescence from precious-metal-free organic luminophores†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2017-12-14 00:00:00 , DOI: 10.1039/c7qm00524e
Masaki Shimizu _{1,

2,

3,

4,

5} , Takumi Kinoshita _{1,

2,

3,

4,

5} , Ryosuke Shigitani _{1,

2,

3,

4,

5} , Yusuke Miyake _{1,

2,

3,

4,

5} , Kunihiko Tajima _{1,

2,

3,

4,

5}

Affiliation

We designed and characterized 1,4-diaroyl-2,5-bis(silylmethoxy)benzenes as precious-metal-free organic luminophores that efficiently phosphoresce at room temperature. The benzene derivatives in crystals emit green phosphorescence with quantum yields up to 0.45 under ambient conditions. The luminescence quantum yield increases with increasing number of intermolecular interactions in the crystal, such as hydrogen bonding and CH–π interactions. The luminescence lifetimes are inversely proportional to temperature over the −80 to 80 °C range, demonstrating the potential of the benzene derivatives as materials for temperature sensing. Poly(methyl methacrylate) films doped with these luminophores also exhibit intense green phosphorescence at room temperature under vacuum, while they emit very faint blue fluorescence under ambient conditions. Electron spin resonance spectroscopy of a UV-excited diphenylmethylsilyl-derivative in toluene at 77 K reveals a triplet diradical species, whose electronic distribution is similar to that of naphthalene, indicating that the triplet diradical is distributed over almost ten atoms.

中文翻译：

使用甲硅烷基甲氧基作为无贵金属有机发光体有效室温磷光的诱导剂†

我们设计和表征了1,4-二酰基2,5-双（甲硅烷基甲氧基）苯，作为不含贵金属的有机发光体，可在室温下有效地磷化。在环境条件下，晶体中的苯衍生物发出绿色磷光，量子产率高达0.45。发光量子产率随晶体中分子间相互作用（例如氢键和CH-π相互作用）的增加而增加。发光寿命与-80至80°C范围内的温度成反比，表明苯衍生物作为感温材料的潜力。掺杂有这些发光体的聚（甲基丙烯酸甲酯）薄膜在室温下在真空下也显示出强烈的绿色磷光，而在环境条件下它们则发出非常微弱的蓝色荧光。

更新日期：2017-12-14

点击分享查看原文

点击收藏

阅读更多本刊最新论文