基于原位缓慢缩聚法构建的CsPbBr3@PZS复合材料及其高稳定性发光性能OA

All-inorganic CsPbBr3 perovskite quantum dots(QDs)have demonstrated immense potential for next-generation display technologies owing to their exceptional optical properties.However,surface defects and ion migration induce environmental instability,thereby limiting their practical applications.Although polymer encapsulation can enhance stability,luminescence degradation and poor dispersion remain critical challenges for high-performance composites.In this work,an in-situ slow polycondensation strategy is proposed to construct a polyphosphazene(PZS)coating on CsPbBr3 QDs.The mild polymerization process enables uniform dispersion of QDs within the polymer matrix,while the abundant heteroatoms(N,P,and S)in the PZS effectively passivate surface Pb2+defects through Lewis base coordination and suppress ion migration.As a result,the average photoluminescence(PL)lifetime is significantly prolonged from 7.50 ns for the pristine QDs to 20.92 ns for the composite,and the composites exhibit excellent stability under water,light,and thermal conditions.After continuous ultraviolet irradiation for 10 h,the PL intensity retention of the composites is improved by 34%compared to that of the pristine QDs.A prototype color-conversion device based on the composite exhibits a narrow-band emission centered at approximately 520 nm with CIE coordinates of(0.155 6,0.702 9).This study provides a facile strategy for developing highly stable perovskite-based composites and establishes a solid foundation for their application in high-performance display technologies.