synthesis of high-efficiency CsPbBr/CsPbBr composite nanocrystals in aqueous solution of microemulsion

• Published in: Green chemistry : an international journal and green chemistry resource : GC 2020-08, Vol.22 (16), p.5257-5261
• Main Authors: Lou, Sunqi, Zhou, Zhi, Gan, Weijiang, Xuan, Tongtong, Bao, Zhen, Si, Shuaichen, Cao, Luyu, Li, Huili, Xia, Zhiguo, Qiu, Jianbei, Liu, Ru-Shi, Wang, Jing
• Format: Article
• Language: English
• ISSN: 1463-9262; 1463-9270
• DOI: 10.1039/d0gc02059a

Here, we present the microemulsion method using sodium dodecylbenzenesulfonate and hydrofluoric acid for the in situ synthesis of brightly luminescent CsPbBr 3 /CsPb 2 Br 5 composite nanocrystals (NCs) in aqueous solution. The obtained CsPbBr 3 /CsPb 2 Br 5 composite NCs exhibit a photoluminescence quantum yield of 77.0% and a full width at half maximum of 16.0 nm. And solid-state back-lighting devices were fabricated by combining CsPbBr 3 /CsPb 2 Br 5 composite NCs and red-emitting K 2 SiF 6 :Mn 4+ phosphors with blue light. The as-fabricated device exhibits a wide color gamut of about 95.8% of the Rec. 2020. This work provides a green, low-cost, and in situ water-phase route to synthesize high-quality cesium lead halide NCs for their practical applications in solid-state back-lighting devices. An innovative microemulsion method was reported for the preparation of CsPbBr 3 /CsPb 2 Br 5 composite NCs in water.