无机氧化物包覆提升绿光CdSe/ZnS量子点扩散板的稳定性OA

This study aims to enhance the optical stability of CdSe/ZnS green quantum dots(QDs)in display applications by addressing their susceptibility to environmental factors,including moisture,oxygen,and incompatibility with polymers,which may result in ligand desorption and a decrease in luminescence efficiency.The more effective protection strategies were explored to improve their photostability and humid-thermal stability under blue light excitation.The QD@SiO2 coating layer was prepared on the surface of green QDs by microemulsion method and Stöber method,respectively.The QD@AlOx coating layer was prepared by sol-gel method.Then,the morphology,structure,and photoluminescence(PL)stability of the prepared QD@SiO2 and QD@AlOx were characterized.Finally,these two types of QD composite were respectively fabricated into green QD diffuser plates,which were subjected to aging tests under blue light(200 mW/cm²)and humid-thermal blue light conditions(50℃/90%RH,5 000 cd/m2 blue light)to assess their photostability and humid-thermal stability in display applications.Experimental results demonstrated that both the prepared QD@SiO2 and QD@AlOx exhibited excellent optical stability under blue light excitation.Among them,the AlOx protective layer has better stability in the humid-thermal aging tests due to its smaller specific surface area and pore volume,and can effectively suppress the attenuation of the photoluminescence efficiency of QDs.This study effectively enhanced the environmental stability of green QDs through two surface coating methods,meeting the essential requirements of display devices for high photostability and humid-thermal stability tolerance.It provides a theoretical basis and practical solution for the development of high-performance QD devices.