Revisiting Carbazole: Origin, Impurity, and Properties,ACS Materials Letters

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Revisiting Carbazole: Origin, Impurity, and Properties
ACS Materials Letters ( IF 9.6 ) Pub Date : 2021-06-21 , DOI: 10.1021/acsmaterialslett.1c00138
Chengjian Chen ₁ , Kok Chan Chong ₁ , Yutong Pan ₁ , Guobin Qi ₁ , Shidang Xu ₁ , Bin Liu _{1,

2}

Affiliation

Photoluminescence quantum yield (PLQY) is one of the most important characteristics for organic luminescent materials. However, when carbazole prepared from the lab was compared to that from a commercial source, a remarkable change of PLQY was observed to vary from 37.1% to 69.8%. Taking 9-(4-bromobenzyl)-9H-carbazole (CzBBr) as an example of carbazole derivatives, the PLQYs of CzBBr synthesized from different origins of carbazole were varied from 16.0% to 91.1%. Our studies demonstrated that efficient radiative transition pathways were activated for commercial carbazole based luminescence, leading to a large enhancement in PLQY with fluorescence (from 16.0% to 54.4%) and phosphorescence (from <1% to 36.7%) for CzBBr. These results suggest that the origin of carbazole plays a very important role in determining the optical properties of carbazole derivatives, alerting us to carefully revisit carbazole and its derivatives, especially those with record-high efficiency.

中文翻译：

重新审视咔唑：来源、杂质和性质

光致发光量子产率 (PLQY) 是有机发光材料最重要的特性之一。然而，当实验室制备的咔唑与商业来源的咔唑进行比较时，观察到 PLQY 的显着变化，从 37.1% 到 69.8%。服用 9-(4-溴苄基)-9 H咔唑（CzBBr）作为咔唑衍生物的一个例子，不同来源咔唑合成的CzBBr的PLQYs从16.0%到91.1%不等。我们的研究表明，商业咔唑基发光的有效辐射跃迁途径被激活，导致 CzBBr 的荧光（从 16.0% 到 54.4%）和磷光（从 <1% 到 36.7%）的 PLQY 大幅增强。这些结果表明咔唑的起源在决定咔唑衍生物的光学性质方面起着非常重要的作用，提醒我们仔细重新审视咔唑及其衍生物，尤其是那些具有创纪录高效率的衍生物。

更新日期：2021-07-05

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