Ultrastable quantum dot composites with dense barrier layer for wide color gamut display

Quantum dots (QDs) have showed great potential for next-generation lighting and display technologies. However, its stability is still one of the key problems that limit its practical application. In this paper, by comparing the specific surface area (SSA) and pore width of aluminum oxide (AlOx) and silicon oxide (SiO2) barrier layers, the relationship between the porosity of barrier layers and the stability of QDs was studied. The results showed that the synthesized SiO2-QD-AlOx, which has the smallest SSA in the synthesized QD composites, exhibited the best stability on the quantum dot diffuser plate (QD-DP). Moreover, the operational lifetime (T80) at 450 nm blue light excitation was increased by a factor of 3.41 compared to that of bare QDs. Meanwhile, the prepared QD-DP containing dense SiO2-QD-AlOx composites significantly improved the resistance to light, heat, moisture and oxygen. Finally, the prepared QD-DP was assembled into a Mini-LED TV with a wide color gamut and excellent display performance (a color gamut of 157.4 % for commercial normal TV, and 107.19 % for the National Television System Committee (NTSC 1931)). This technique provides favorable guide for effectively enhancing the stability of QDs in lighting and display technologies.