Stretchable displays that can change their shape and size under strain could be used to create displays with unconventional form factors. However, intrinsically stretchable light-emitting devices have poor luminous performance, such as low brightness. Here we show that intrinsically stretchable quantum dot light-emitting diodes (QLEDs) can be made using a mechanically soft and stretchable emissive layer consisting of a ternary nanocomposite of colloidal quantum dots, an elastomeric polymer and a charge transport polymer. The light-emitting layer maintains a nearly constant interparticle distance even under 50% strain, ensuring reliable operation of the QLED under stretching. The polymer-rich charge transport region at the bottom of the nanocomposite functions as a hole transport pathway to the embedded quantum dots. The QLEDs exhibit a turn-on voltage of 3.2 V and a maximum luminance of 15,170 cd m⁻² at 6.2 V without loss of brightness, even when under 50% strain, and can be used to make stretchable full-colour passive-matrix QLED arrays.

可拉伸显示器可以在压力下改变其形状和尺寸，可用于创建具有非常规外形尺寸的显示器。然而，本质上可拉伸的发光器件的发光性能较差，例如亮度低。在这里，我们展示了本质上可拉伸的量子点发光二极管（QLED）可以使用机械柔软且可拉伸的发射层来制造，该发射层由胶体量子点、弹性体聚合物和电荷传输聚合物的三元纳米复合材料组成。即使在 50% 的应变下，发光层也能保持几乎恒定的颗粒间距离，确保 QLED 在拉伸下可靠运行。纳米复合材料底部富含聚合物的电荷传输区域充当嵌入量子点的空穴传输路径。 QLED 的开启电压为 3.2 V，在 6.2 V 电压下的最大亮度为 15,170 cd m ^-2，即使在 50% 应变下也不会损失亮度，并且可用于制造可拉伸全彩无源矩阵 QLED数组。