Electroluminescent White Light‐Emitting Diodes Based on Inorganic Materials: Recent Progress and Perspectives

With the development of the lighting market, people's reliance on high‐efficiency lighting has grown. Inorganic nanocrystals are highly promising candidates for electroluminescent white light‐emitting diodes (WLEDs) as next‐generation light sources due to their high luminance and high efficiency. This review categorizes recent advances in WLEDs into two categories based on the emitting layer (EML): multi‐component mixed systems and single‐component systems. For multi‐component systems with the advantage of high color rendering indices (CRI), homologous and heterologous nanocrystal mixture with record‐high CRI were summarized. For single‐component systems with the advantage of high efficiency potential, the underlying luminescence mechanisms were compared, including multi‐defect state recombination, intrinsic self‐trapped exciton emission, and doping‐induced white emission, with spectral stability discussion. Notably, this review incorporates cutting‐edge progress, such as II‐VI quantum dot‐based WLEDs (WQLEDs). Finally, key optical and electrical metrics to assess the current state of WQLED development were recapitulated to further identify persistent bottlenecks such as charge injection imbalance and operational stability, and providing forward‐looking perspectives on the transition toward heavy‐metal‐free, industrial‐scale applications.