Abstract
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.
Highlights
Efficient single-component white light emitters (SWLEs), are attractive candidates for the simple and cost-effective fabrication of high-performance lighting devices
Light sources based on white organic light-emitting diodes (WOLEDs), owing to their high efficiency and flexibility, low final price, long lifespan, and good color quality have emerged as a powerful platform to replace the traditional lighting devices such as the incandescent bulb, fluorescent lamps, and inorganic light-emitting diodes (LED)[1–4]
The solvatochromic effect of the chromophores was investigated from the absorption and emission spectra in low to high polarity solvents including xylene, ethyl acetate (ETA), dichloromethane (DCM), ethanol, and dimethylformamide (DMF)
Summary
Efficient single-component white light emitters (SWLEs), are attractive candidates for the simple and cost-effective fabrication of high-performance lighting devices. 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). Employing single-component white light emitters (SWLEs) whose emission spectra cover the whole visible region ranging from 400 to 700 nm can be an exceptional alternative for the simple fabrication of WOLEDs without the previously mentioned drawbacks. Tunable fluorescent devices can be fabricated by a single halochromic chromophore through pH regulation instead of using multiple emitters in separate layers They benefit from better color fastness during multiple voltage cycles and prolonged application time[35]. In continuation of our previous r eports[45–50], two highly efficient donor–π–acceptor and donor–π–donor stilbene-based fluorescent chromophores (Fig. 1) with white light emission introduced and their photophysical properties investigated
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