Here, we propose a facile strategy to realize all-solution-processed highly efficient full-color-enabling white emitting quantum dot light-emitting diodes (QLEDs) at ambient conditions by using low-cost blade coating technique, which was also compatible with the roll to roll fabrication process for large size production. Firstly, by using red quantum dots (QDs) as the representative to optimize the QDs films by blade coating, the QDs films exhibit excellent morphology and well-ordered self-assembly structure. Then, the trichromatic white QLEDs based on mixed red, green and blue quantum dots were obtained with Commission Internationale De I'Eclairage (CIE) coordinates ranging from (0.42, 0.41) to (0.31, 0.33) within the white region of CIE 1931 when driving voltage vary from 5 v to 8 v. The device enjoys excellent optoelectronic performance including a maximum luminance of 11,465 cd/m², a maximum current efficiency (η_A) of 9.2 cd/A and an external quantum efficiency (EQE) of 3.7%. In addition, 3 × 8 cm² white QLEDs with bright and homogenous light emission fabricated by blade coating are demonstrated. Our strategy for fabricating large-area white QLEDs indicate promising applications in the low-cost solid-state lighting and flat-panel displays.

在这里，我们提出了一种可行的策略，即通过使用低成本的叶片涂层技术，在环境条件下实现全溶液处理的高效全色发光白点量子点发光二极管（QLED），该技术也与卷到卷的制造过程，可进行大批量生产。首先，以红色量子点（QDs）为代表，通过叶片涂布优化QDs薄膜，QDs薄膜具有良好的形貌和良好的自组装结构。然后，在CIE 1931的白色区域内，使用国际照明委员会（CIE）坐标从（0.42，0.41）到（0.31，0.33）的坐标获得基于混合的红色，绿色和蓝色量子点的三色白色QLED。驱动电压从5 V到8 V不等。²，最大电流效率（η_甲）9.2坎德拉/ A和3.7％的外量子效率（EQE）。此外，还演示了通过刀片涂膜制造的3×8 cm ²白色QLED，具有明亮且均匀的发光。我们制造大面积白色QLED的策略表明，在低成本固态照明和平板显示器中的应用前景广阔。