White light-emitting diodes (WLEDs) hold great promise in lighting, display, and visible light communication devices, and single-component white emission carbon quantum dots (SCWE-CQDs) as the key component of WLEDs have many outstanding advantages. However, rapid and efficient synthesis of SCWE-CQDs with high photoluminescence quantum yield (PLQY) and stability remains challenging. Here, we report a novel solvent engineering strategy to obtain highly photoluminescent SCWE-CQDs by controlling the dilution ratios between N,N -dimethylformamide (DMF) and pristine red carbon quantum dots (RCQDs) solution. By optimizing synthesis conditions, the relative PLQY of the SCWE-CQDs solution reached 53%. Morphological, structural, and optical property characterizations indicate that the combined action of the hydrogen bond (HB) effect and the size effect leads to the blue shift of RCQDs, but the HB effect is more dominant than the particle size in causing large spectral shifts. In addition, the WLEDs with high color rendering index of 89 and remarkable reliability were obtained based on the highly photoluminescent SCWE-CQDs. This facile solvent engineering approach for synthesizing tunable emission CQDs will promote the progress of carbon-based luminescent materials for applications in optoelectronic devices.

中文翻译：

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用于白色发光二极管的单组分白色发射碳量子点的溶剂调节合成

白光发光二极管 (WLED) 在照明、显示和可见光通信设备中具有广阔的应用前景，作为 WLED 关键组件的单组分白光发射碳量子点 (SCWE-CQD) 具有许多突出的优势。然而，快速有效地合成具有高光致发光量子产率 (PLQY) 和稳定性的 SCWE-CQDs 仍然具有挑战性。在这里，我们报告了一种新的溶剂工程策略，通过控制 N,N-二甲基甲酰胺 (DMF) 和原始红碳量子点 (RCQDs) 溶液之间的稀释比来获得高度光致发光的 SCWE-CQD。通过优化合成条件，SCWE-CQDs溶液的相对PLQY达到53%。形态、结构、和光学性质表征表明，氢键（HB）效应和尺寸效应的共同作用导致了 RCQDs 的蓝移，但 HB 效应比引起大的光谱位移的粒径更占优势。此外，基于高光致发光 SCWE-CQD 获得了具有 89 的高显色指数和卓越可靠性的 WLED。这种用于合成可调发射 CQD 的简便溶剂工程方法将促进碳基发光材料在光电器件中应用的进展。基于高光致发光 SCWE-CQD 获得了具有 89 高显色指数和卓越可靠性的 WLED。这种用于合成可调发射 CQD 的简便溶剂工程方法将促进碳基发光材料在光电器件中应用的进展。基于高光致发光 SCWE-CQD 获得了具有 89 高显色指数和卓越可靠性的 WLED。这种用于合成可调发射 CQD 的简便溶剂工程方法将促进碳基发光材料在光电器件中应用的进展。