Research status of the blue InP and ZnSe quantum dots for electroluminescent quantum-dot light-emitting diodes

As one of the strong competitors of traditional displays,quantum dot light-emitting diodes(QLED) have attracted much attention in the display field. However,the luminescent materials of high-performance blue QLED devices usually contain cadmium or lead which are toxic and harmful to human health and the ecological environment,and also hinder the large-scale commercial process of QLED devices,therefore,the research and development of high-quality cadmium- free and lead-free blue quantum dots have become the driving force to promote the development of new display industry and the industry's urgent goals. After decades of development,the blue-emitting performance of cadmium-free and lead-free QDs such as InP and ZnSe has made great progress. With the further optimization and improvement of synthesis strategies and material compositions,the performance of environment-friendly blue-emiting QLED devices is expected to catch up with the pace of traditional red and green QLEDs. In this paper,the current research progress of cadmium-free and lead-free blue-emitting InP and ZnSe quantum dots are systematically summarized including the synthesis optimization methods, surface coating strategies, core-shell structure types, luminescence performance parameters and other aspects. Finally,the future development direction of QLED based blue-emitting materials is pointed out.