“Quantum dot light-emitting diodes (QLEDs), as a new generation of self luminous display technology, have attracted much attention due to their low power consumption, high color purity, and wide color gamut advantages. However, currently efficient QLEDs mainly rely on CdSe or Pb containing perovskite quantum dots, and the environmental risks caused by heavy metals limit their industrial development. Environmentally friendly quantum dot materials without cadmium and lead have become the core alternative solution for promoting the large-scale commercialization of QLED. Among numerous candidate systems, ZnSeTe quantum dots, with their excellent luminescence performance and unique band adjustment mechanism, can achieve a wide range of continuous emission from 450 nm blue light to 700 nm red light, making them the most promising single system environmentally friendly full-color luminescent material. However, the ZnSeTe system still faces technical challenges such as lattice strain, interface defects, and imbalanced device charge transfer caused by high Te content. This article systematically reviews the synthesis of ZnSeTe quantum dots and their latest progress in QLED applications, with a focus on optimizing the emission strategies of blue, green, and red primary colors. The mechanisms and latest achievements of component engineering, shell engineering, and surface engineering are analyzed, and the future development directions in stability, large-scale synthesis, and device efficiency are discussed.”