Kwon Hyukmin, Park Sunwoo, Kang Seokwoo, Lee Hayoon, Park Jongwook
Integrated Engineering, Department of Chemical Engineering, Kyung Hee University, Yongin 17104, Korea.
Molecules. 2022 Jun 21;27(13):3982. doi: 10.3390/molecules27133982.
Three organic blue-light-emitting tetraphenylethylene (TPE) derivatives that exhibit aggregation-induced emission (AIE) were used as additives in the preparation of inorganic perovskite-structured green-light-emitting materials for three-color white-light emission. For these organic-inorganic light-emitting materials, two-color (blue and green) light-emitting films based on the CsPbBr perovskite-structured green-light-emitting inorganic material were prepared. The three TPE derivatives were prepared by varying the number of bromide groups, and a distinct AIE effect was confirmed when the derivatives were dissolved in a water-tetrahydrofuran mixed solvent containing 90 vol% water. When 0.2 molar ratio of the 1,1,2,2-tetrakis(4-bromophenyl)ethylene (TeBrTPE) additive was mixed with nanocrystal-pinning toluene solvent, the green-light-emission photoluminescence quantum efficiency (PLQY) value at 535 nm was 47 times greater than that of the pure bulk CsPbBr without additives and a blue emission at 475 nm was observed from the TeBrTPE itself. When a CBP:Ir(piq) film was prepared on top of this layer, three PL peaks with maximum wavelength values of 470, 535, and 613 nm were confirmed. The film exhibited white-light emission with CIE color coordinates of (0.25, 0.36).
三种表现出聚集诱导发光（AIE）的有机蓝光发射四苯基乙烯（TPE）衍生物被用作添加剂，用于制备用于三色白光发射的无机钙钛矿结构的绿光发射材料。对于这些有机-无机发光材料，制备了基于CsPbBr钙钛矿结构的绿光发射无机材料的双色（蓝色和绿色）发光薄膜。通过改变溴化物基团的数量制备了三种TPE衍生物，当这些衍生物溶解在含有90体积%水的水-四氢呋喃混合溶剂中时，证实了明显的AIE效应。当将0.2摩尔比的1,1,2,2-四（4-溴苯基）乙烯（TeBrTPE）添加剂与纳米晶钉扎甲苯溶剂混合时，535nm处的绿光发射光致发光量子效率（PLQY）值比无添加剂的纯块状CsPbBr高47倍，并且从TeBrTPE本身观察到475nm处的蓝光发射。当在该层顶部制备CBP:Ir(piq)薄膜时，确认了三个最大波长值分别为470、535和613nm的PL峰。该薄膜表现出白光发射，CIE色坐标为(0.25, 0.36)。
