Advantages:

1. The emission spectrum of quantum dots (QDs) is adjustable and the half-peak width is narrow, supporting the BT2020 standard with a wider color range; 2. 2. Low starting voltage is conducive to the reduction of power consumption; 3. The core-shell structure is easy to be fine-tuned to obtain excellent optical properties and thermal stability; 4. Good solution processing performance, suitable for high throughput and low cost printing process. Therefore, QLED has attracted extensive attention from academia and industry in recent years. The inorganic electron transport layer and organic/QDs hybrid device structure were inorganic. Inorganic QLED with high performance blue, green, and red light was reported quite frequently. Among them, the organic hole transport layer mainly USES poly-TPD, PVK or PFB polymers, while the inorganic electron transport layer mainly USES ZnO nanocrystals or their derivatives. Since the electron mobility of ZnO is greater than that of the polymer hole transport material, electrons will accumulate at the interface of the hole transport layer/luminescent layer, resulting in unbalanced carrier transport and non-radiative Auger recombination. On the other hand, ZnO nanocrystal crystals are greatly affected by the environment, and there are problems such as poor stability, difficulty in batch synthesis and storage, etc., which make it impossible to combine with the ink-jet printing process in the capacity production process.

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