Ultrastable and highly efficient CsPbBr_(3) composites achieved by dual-matrix encapsulation for display devices  

作　　者：Chao Fan Haipeng Liu Jianwu Zhou Xingliang Dai Haiping He Zhizhen Ye 

机构地区：[1]Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials,Institute of Wenzhou,Zhejiang University,Wenzhou,the People's Republic of China [2]School of Materials Science and Engineering,State Key Laboratory of Silicon Materials,Zhejiang University,Hangzhou,the People's Republic of China [3]Wenzhou XINXINTAIJING Tech.Co.Ltd.,Wenzhou,the People's Republic of China [4]Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan,the People's Republic of China

出　　处：《InfoMat》2023年第7期59-69,共11页信息材料（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:52102188,52072337;Key Research and Development Program of Zhejiang Province,Grant/Award Number:2021C01030;Young Elite Scientists Sponsorship Program by CAST,Grant/Award Number:YESS20210444;Natural Science Foundation of Zhejiang Province,Grant/Award Number:LQ21F040005;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Grant/Award Number:2022SZ-TD004;Leading Talent Entrepreneurship Project of Ouhai District,Wenzhou City;China Postdoctoral Science Foundation,Grant/Award Number:2022TQ0267。

摘　　要：Perovskite nanocrystals(NCs)with high stabilities and excellent optical perfor-mances are crucial for display applications.However,to date,perovskite emitters with both high photoluminescence(PL)quantum yield(PLQY)and high stabili-ties under harsh synergistic humidity–heat–light aging conditions have not been reported.The promising high-temperature solid-state sintering with single oxide matrices cannot ensure high PLQY and synergistic aging stabilities of perovskites.Herein,both the PLQY and overall(thermal,moisture,and photo)stabilities of all-inorganic perovskite(CsPbBr_(3))NCs are improved by dual-matrix encapsula-tion,which is accomplished by in situ crystallization of CsPbBr_(3)@Cs_(4)PbBr_(6)nanocomposites in silica molecular sieve(MS)templates via advanced solid-state synthesis a using precisely controlled molar ratio of precursor components and cooling rates.The Cs_(4)PbBr_(6)matrix effectively passivates the surfaces of CsPbBr_(3)NCs,and the MS matrix insulates CsPbBr_(3)@Cs_(4)PbBr_(6)from the external environ-ment.The resulting CsPbBr_(3)@Cs_(4)PbBr_(6)/MS composites exhibit the highest PLQY(>90%)among those of the solid-state perovskite NCs and significant stabilities against water,heat,and blue light irradiation,maintaining more than 80%of their initial PL intensities after being aged for 1000 h under synergistic high-humidity(85%),high-temperature(85C),and strong blue light irradiation(350 mW cm2)conditions.To the best of our knowledge,these CsPbBr_(3)@Cs_(4)PbBr_(6)/MS composites represent the most stable perovskite emitters under synergistic humidity–heat–light aging conditions.The liquid crystal display backlight module fabricated using these stable composites demonstrates a wide color gamut of 131%of the National Television Standards Committee standard.We speculate that this dual-matrix encapsulation can be used for industrial mass production.

关 键 词：all-inorganic perovskite DISPLAY matrix encapsulation stability 

分 类 号：TB33[一般工业技术—材料科学与工程]