Panahi Farhad, Mahmoodi Ali, Ghodrati Sajjad, Abdi Ali Ashtiani, Eshghi Fazlolah
Chemistry Department, College of Sciences, Shiraz University, 71454, Shiraz, Iran.
Department of Polymer Engineering and Color Technology, Amirkabir University of Technology, Tehran, Iran.
Sci Rep. 2022 Feb 11;12(1):2385. doi: 10.1038/s41598-022-06435-w.
Highly efficient single-component white light emitters (SWLEs), are attractive candidates for the simple and cost-effective fabrication of high-performance lighting devices. This study introduced a donor-π-acceptor and a donor-π-donor stilbene-based chromophores, representing pH-responsive fluorescence. The emitters showed yellow and green fluorescence in their neutral form. At the same time, protonation of the chromophores caused blue fluorescence color with a strong hypsochromic shift. The white light emission (WLE) for these chromophores was observed at approximately pH 3 due to the simultaneous presence of the neutral and protonated forms of the chromophores, covering almost all the emission spectra in the visible region (400-700 nm). These chromophores presented exceptional white light quantum yields (Φ) between 31 and 54%, which was desirable for producing white light-emitting devices. Density functional theory (DFT) and time-dependent (TD)-DFT were applied to study the structural and electronic properties of the chromophores.
高效单组分白光发射体（SWLEs）是用于简单且经济高效地制造高性能照明设备的有吸引力的候选材料。本研究介绍了一种供体-π-受体和一种供体-π-供体芪基发色团，它们具有pH响应荧光特性。这些发射体在中性形式下呈现黄色和绿色荧光。同时，发色团的质子化导致蓝色荧光颜色并伴有强烈的蓝移。由于发色团的中性和质子化形式同时存在，在约pH 3时观察到这些发色团的白光发射（WLE），几乎覆盖了可见光区域（400 - 700 nm）的所有发射光谱。这些发色团具有31%至54%的优异白光量子产率（Φ），这对于制造白光发射器件是理想的。应用密度泛函理论（DFT）和含时（TD）-DFT来研究发色团的结构和电子性质。
