We present a facile synthesis for preparing network (NW)–silica-coated green- and red-emitting Cd-based quantum dot [pristine GRQD] powders. Mixing these powders with a methylphenyl silicone (MPS) encapsulant leads to an excellent long-term operation as QD-on-chip white light-emitting diodes (WLEDs). Pristine QDs coated with NW– or chain (Ch)–silica structures (determined by the synthesis temperature) were obtained by a hydrolysis/condensation pathway. Experimentally, in a harsh stability analysis, the as-synthesized NW–silica-coated G(R)QD nanoparticles [G(R)QD@NW–silica NPs] presented evident enhancements against the high blue energy irradiation (~45 mW), a water medium (aging for 1,000 hr), and heat (to 300°C) when compared with that of pristine G(R)QDs. Notably, the GRQD@NW–silica/MPS hybrid WLEDs (composite QD–WLEDs) were subjected to a high temperature and high humidity condition (85°C/85% RH) for long-term aging, which demonstrated that the luminous flux was maintained at 100% after aging for 1,000 hr (that of pristine QD–WLEDs decays 23%). Additionally, composite QD–WLEDs were also subjected to a long-term reliability analysis (25°C/60% RH) and exhibited an outstanding reliability with only 17% decay after continuous operation for 2,352 hr, as well as a high luminous efficacy of 81 lm/W and a wide color gamut (122% of NTSC). This study proposes an effective approach for improving the luminous efficiency and long-term operation of composite QD–WLEDs, which have tremendous potential for use in next-generation display applications such as full-color mini-LEDs and micro-LEDs.

我们提出了一种简便的合成方法，用于制备网络（NW）–涂有二氧化硅的绿色和红色发光的Cd基量子点[原始GRQD]粉。将这些粉末与甲基苯基硅酮（MPS）密封剂混合后，可作为片上QD白色发光二极管（WLED）获得出色的长期运行。通过水解/缩合途径获得了涂覆有NW-或链（Ch）-二氧化硅结构（由合成温度决定）的原始QD。实验中，在苛刻的稳定性分析中，已合成的NW-二氧化硅涂层的G（R）QD纳米颗粒[G（R）QD @ NW-二氧化硅NPs）对高蓝色能量辐射（〜45 mW）表现出明显的增强，与原始G（R）QDs相比，水介质（老化1000 hr）和加热（至300°C）。值得注意的是 GRQD @ NW-silica / MPS混合WLED（复合QD-WLED）经过高温高湿条件（85°C / 85％RH）长期老化，这表明光通量保持在老化1000小时后100％（原始QD-WLED的衰减量为23％）。此外，复合QD-WLED还经过长期可靠性分析（25°C / 60％RH），并且具有出色的可靠性，在连续运行2,352 hr后衰减仅为17％，并且具有很高的发光效率。 81 lm / W和宽色域（NTSC的122％）。这项研究提出了一种提高复合QD-WLED的发光效率和长期运行的有效方法，这种复合QD-WLED在诸如全色mini-LED和micro-LED等下一代显示应用中具有巨大的潜力。