Extremely Vivid, Highly Transparent, and Ultrathin Quantum Dot Light‐Emitting Diodes,Advanced Materials

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Extremely Vivid, Highly Transparent, and Ultrathin Quantum Dot Light‐Emitting Diodes
Advanced Materials ( IF 27.4 ) Pub Date : 2017-10-25 , DOI: 10.1002/adma.201703279
Moon Kee Choi _{1,

2} , Jiwoong Yang _{1,

2} , Dong Chan Kim _{1,

2} , Zhaohe Dai ₃ , Junhee Kim _{1,

2} , Hyojin Seung _{1,

2} , Vinayak S. Kale _{1,

2} , Sae Jin Sung ₄ , Chong Rae Park ₄ , Nanshu Lu ₃ , Taeghwan Hyeon _{1,

2} , Dae-Hyeong Kim _{1,

2}

Affiliation

Displaying information on transparent screens offers new opportunities in next‐generation electronics, such as augmented reality devices, smart surgical glasses, and smart windows. Outstanding luminance and transparency are essential for such “see‐through” displays to show vivid images over clear background view. Here transparent quantum dot light‐emitting diodes (Tr‐QLEDs) are reported with high brightness (bottom: ≈43 000 cd m⁻², top: ≈30 000 cd m⁻², total: ≈73 000 cd m⁻² at 9 V), excellent transmittance (90% at 550 nm, 84% over visible range), and an ultrathin form factor (≈2.7 µm thickness). These superb characteristics are accomplished by novel electron transport layers (ETLs) and engineered quantum dots (QDs). The ETLs, ZnO nanoparticle assemblies with ultrathin alumina overlayers, dramatically enhance durability of active layers, and balance electron/hole injection into QDs, which prevents nonradiative recombination processes. In addition, the QD structure is further optimized to fully exploit the device architecture. The ultrathin nature of Tr‐QLEDs allows their conformal integration on various shaped objects. Finally, the high resolution patterning of red, green, and blue Tr‐QLEDs (513 pixels in.⁻¹) shows the potential of the full‐color transparent display.

中文翻译：

极其生动，高度透明且超薄的量子点发光二极管

在透明屏幕上显示信息为下一代电子设备提供了新的机会，例如增强现实设备，智能手术眼镜和智能窗户。出色的亮度和透明度对于此类“透视”显示器在清晰的背景视图下显示生动的图像至关重要。此处报道的透明量子点发光二极管（Tr-QLED）具有高亮度（底部：≈43000 cd m ^-2，顶部：≈30000cd m ^-2，总计：≈73000 cd m ^-2在9 V电压下），极佳的透射率（在550 nm处为90％，在可见光范围内为84％）和超薄外形（≈2.7µm厚度）。这些出色的特性是通过新型电子传输层（ETL）和工程量子点（QD）实现的。ETL是具有超薄氧化铝覆盖层的ZnO纳米粒子组件，可显着增强活性层的耐用性，并平衡电子/空穴注入QD中的数量，从而防止了非辐射复合过程。此外，进一步优化了QD结构以充分利用设备架构。Tr-QLED的超薄特性使其可以在各种形状的物体上进行保形整合。最后，红色，绿色和蓝色Tr-QLED的高分辨率图案（513像素，^-1）显示了全色透明显示器的潜力。

更新日期：2017-10-25

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