Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence in Sulfidoazatriangulene-Based Materials and their S-oxides,Advanced Optical Materials

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Thermally Activated Delayed Fluorescence and Room-Temperature Phosphorescence in Sulfidoazatriangulene-Based Materials and their S-oxides
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2023-03-15 , DOI: 10.1002/adom.202202754
Seja A. Elgadi ₁ , Don M. Mayder ₁ , Ryoga Hojo ₁ , Zachary M. Hudson ₁

Affiliation

Structural constraint is an emerging strategy for improving the photoluminescence quantum yield, molar absorptivity, and color purity of luminescent materials. In this report, emitters displaying thermally activated delayed fluorescence (TADF) are achieved for the first time using the planarized donor sulfidotetramethyazatriangulene (SMAT). Compared to non-planarized phenothiazine (PTZ) donors, the enhanced rigidity of SMAT contributes to improved color purity and photoluminescence quantum yield, with up to 90% quantum yield observed for donor–acceptor compounds in toluene solution. Planarized SMAT-based emitters also offer up to tenfold enhancement in two-photon absorption cross-section compared to analogous PTZ-based materials. Oxidation of sulfur-containing donors to sulfoxide and sulfone derivatives is demonstrated as a simple and generalizable means of tuning the electron-donating ability of sulfur-containing moieties. SMAT-TRZ and SOMAT-TRZ both exhibit TADF, with green and blue emission, respectively, while SO₂MAT-TRZ displays blue room temperature phosphorescence. Overall, this work demonstrates that SMAT and its S-oxides can be used to design high-performance luminescent materials with emergent properties such as TADF or room-temperature phosphorescence.

中文翻译：

硫化氮杂三烯基材料及其 S-氧化物中的热激活延迟荧光和室温磷光

结构约束是提高发光材料的光致发光量子产率、摩尔吸收率和色纯度的新兴策略。在本报告中，显示热激活延迟荧光 (TADF) 的发射器首次使用平面化供体硫化四甲基氮杂三烯 (SMAT) 实现。与非平面化吩噻嗪 (PTZ) 供体相比，SMAT 的刚性增强有助于提高色纯度和光致发光量子产率，在甲苯溶液中观察到供体-受体化合物的量子产率高达 90%。与类似的基于 PTZ 的材料相比，基于平面化 SMAT 的发射器还提供高达十倍的双光子吸收截面增强。将含硫供体氧化为亚砜和砜衍生物被证明是一种简单且可推广的调节含硫部分供电子能力的方法。SMAT-TRZ 和 SOMAT-TRZ 都表现出 TADF，分别具有绿色和蓝色发射，而 SO₂ MAT-TRZ 显示蓝色室温磷光。总的来说，这项工作表明 SMAT 及其 S-氧化物可用于设计具有涌现特性的高性能发光材料，例如 TADF 或室温磷光。

更新日期：2023-03-15

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