Solution-processed electroluminescent tandem white quantum-dot light-emitting diodes (TWQLEDs) have the advantages of being low-cost and high-efficiency and having a wide color gamut combined with color filters, making this a promising backlight technology for high-resolution displays. However, TWQLEDs are rarely reported due to the challenge of designing device structures and the deterioration of film morphology with component layers that can be deposited from solutions. Here, we report an interconnecting layer with the optical, electrical, and mechanical properties required for fully solution-processed TWQLED. The optimized TWQLEDs exhibit a state-of-the-art current efficiency as high as 60.4 cd/A and an extremely high external quantum efficiency of 27.3% at a luminance of 100 000 cd/m². A high color gamut of 124% NTSC 1931 standard can be achieved when combined with commercial color filters. These results represent the highest performance for solution-processed WQLEDs, unlocking the great application potential of TWQLEDs as backlights for new-generation displays.

中文翻译：

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经过完全溶液处理的串联式白色量子点发光二极管，外部量子效率超过25％

溶液处理的电致发光串联白色量子点发光二极管（TWQLED）具有成本低，效率高，色域广且与滤色片结合的优点，这使其成为用于高分辨率显示器的有前途的背光技术。然而，由于设计器件结构的挑战以及具有可以从溶液中沉积的组分层的膜形态的恶化，很少报道TWQLED。在这里，我们报告了具有完全固溶处理的TWQLED所需的光学，电气和机械性能的互连层。经过优化的TWQLED在10万cd / m ²的亮度下具有高达60.4 cd / A的最新电流效率和27.3％的极高外部量子效率。与商用滤色片结合使用时，可以达到124％NTSC 1931标准的高色域。这些结果代表了解决方案处理的WQLED的最高性能，释放了TWQLED作为新一代显示器的背光的巨大应用潜力。