Over 32.5% Efficient Top-Emitting Quantum-Dot LEDs with Angular-Independent Emission,ACS Applied Materials & Interfaces

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Over 32.5% Efficient Top-Emitting Quantum-Dot LEDs with Angular-Independent Emission
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-06-22 , DOI: 10.1021/acsami.2c06670
Liangliang Shi ₁ , Shuming Chen ₁

Affiliation

Top-emitting quantum-dot light-emitting diodes (TQLEDs) with light emitted from the top semitransparent electrodes can improve the aperture ratio, efficiency, and color saturation of displays. However, because of the microcavity effect induced by the top semitransparent electrodes, the devices usually exhibit angular-dependent emission, which is unfavorable for display applications. In this study, highly transparent and conductive indium zinc oxide (IZO) is used as the top electrode to reduce the microcavity effect, thereby improving the angular color stability. By further applying a nanosphere scattering layer on the IZO top electrode, the trapped light is greatly extracted, and thus, the external quantum efficiencies (EQEs) are remarkably improved by 35, 50, and 133% for the red, green, and blue devices, respectively. The champion red TQLEDs exhibit a record EQE of 32.5% with angular-independent color emission. The demonstrated TQLEDs with high efficiency, high color stability, and a high aperture ratio could be the ideal candidates for QLED displays.

中文翻译：

效率超过 32.5% 的顶部发射量子点 LED，具有与角度无关的发射

顶部半透明电极发射光的顶部发射量子点发光二极管 (TQLED) 可以提高显示器的开口率、效率和色彩饱和度。然而，由于顶部半透明电极引起的微腔效应，器件通常表现出与角度相关的发射，这不利于显示应用。在这项研究中，高透明导电的氧化铟锌（IZO）被用作顶部电极，以减少微腔效应，从而提高角颜色稳定性。通过在 IZO 顶部电极上进一步应用纳米球散射层，捕获的光被大量提取，因此红色、绿色和蓝色器件的外部量子效率 (EQE) 显着提高了 35%、50% 和 133% ，分别。冠军红色 TQLED 表现出 32.5% 的创纪录的 EQE，具有与角度无关的颜色发射。所展示的具有高效率、高色彩稳定性和高孔径比的 TQLED 可能是 QLED 显示器的理想候选者。

更新日期：2022-06-22

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