Quantum dots (QDs) have attracted tremendous attention due to their outstanding optical properties, which show great potential for next generation lighting and displays. In particular, dual-color QDs (green- and red-emitting) offer significant advantages over the conventional phosphors used in white light-emitting diode (WLED) applications, which are replacing traditional fluorescent lamps due to their improved energy efficiency. However, a facile synthesis of well-controlled dual-color QDs is still one of the major constraints on a wider application of QD-WLEDs. Here, we report a developed one-pot synthesis method to produce dual-color QDs for WLED application. The size and fraction of red and green QDs can be controlled precisely during the synthetic process using HDA and HDA/TOPO as sophisticated capping reagents, respectively, thus manifesting decent optical properties and remarkably enhanced stability. One of our samples, GR_0.75 QDs, is demonstrated to produce pure white color in a fabricated WLED device up to 18 hours. Based on advanced characterization, our findings reveal the critical role of the specific capping reagent in the synthesis and structure control of dual-color QDs, while the results regarding the enhanced stability may broaden the avenues for future QD-WLED applications.

中文翻译：

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为白色发光二极管应用开发了双色CdSe量子点的一锅合成†

量子点（QD）由于其出色的光学性能而引起了极大的关注，这些量子点在下一代照明和显示器中显示出巨大的潜力。特别是，双色QD（发绿光和发红光​​）与白光发光二极管（WLED）应用中使用的常规磷光体相比具有明显优势，白光发光二极管由于提高了能效而取代了传统荧光灯。但是，易于控制的双色QD的合成仍然是QD-WLED广泛应用的主要限制之一。在这里，我们报告一种开发的一锅法合成方法，以生产用于WLED应用的双色QD。分别使用HDA和HDA / TOPO作为复杂的封端试剂，可以在合成过程中精确控制红色和绿色QD的大小和比例，因此表现出不错的光学性能并显着提高了稳定性。我们的样本之一，GR_0.75 QDs被证明可以在人造WLED器件中产生长达18小时的纯白色。基于先进的表征，我们的发现揭示了特定的封端剂在双色QD的合成和结构控制中的关键作用，而有关增强稳定性的结果可能会拓宽未来QD-WLED应用的途径。