Optimization and Research Progress of QLED Performance Based on Metal Oxide Functional Layer

： Because metal oxides have good thermal stability and low sensitivity to water/oxygen ， they are used as the most important charge transfer materials in quantum dot light emitting diodes （ QLED ） devices. However ， the charge transfer ability of different metal oxides is different ， and the interface energy level matching problem in differ⁃ ent device structures will cause the charge imbalance and even lead to exciton quenching. Therefore ， in order to ob⁃ tain good device performance ， it is necessary to modify and optimize the interface while ensuring the stability of the material. In this paper ， metal oxides as charge transport layer ， charge injection layer and charge blocking layer are described respectively ， and the development of metal oxides in QLED applications in recent years is summarized by mixing other materials and constructing reasonable device structures