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Room‐Temperature Ion‐Exchange‐Mediated Self‐Assembly toward Formamidinium Perovskite Nanoplates with Finely Tunable, Ultrapure Green Emissions for Achieving Rec. 2020 Displays
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-03-12 , DOI: 10.1002/adfm.201800248 Dejian Yu 1 , Fei Cao 1 , Yujie Gao 1 , Yunhai Xiong 1 , Haibo Zeng 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2018-03-12 , DOI: 10.1002/adfm.201800248 Dejian Yu 1 , Fei Cao 1 , Yujie Gao 1 , Yunhai Xiong 1 , Haibo Zeng 1
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Delicate engineering of chromaticity is required to faithfully reproduce colors in a backlit display, this is extremely difficult for green downconverters because the human eye is highly sensitive to green colors. The central challenge is to achieve finely tunable green emissions in the narrow range of 525–535 nm while keeping the full width at half maximum (FWHM) <25 nm at the same time. Here, a room‐temperature ion‐exchange‐mediated self‐assembly strategy for preparing FAPbBr3 (FA = CH(NH2)2+) nanoplates (NPs) to fulfill this goal is introduced. 2D layered OA2PbBr4 (OA is octadecylamine) NPs are first synthesized by spontaneous reprecipitation, and are then transformed into FAPbBr3 NPs through a OA+‐to‐FA+ exchange induced self‐assembly of HP monolayers. A c‐axis contraction in this process makes a relative large thickness variation in OA2PbBr4 NPs, which can be realized by simply varying the precursor concentration, only result in a small thickness change in subsequent FAPbBr3 NPs, thereby enabling finely tunable emissions in the range of 525–535 nm along with FWHM <25 nm and a quantum yield up to 85%. As a downconverter, the FAPbBr3 NPs realize an ultrapure green backlight that covers ≈95% Rec. 2020 standard in the CIE 1931 color space.
中文翻译：
室温离子交换介导的自组装，向具有精细可调的超纯绿色排放的甲钙钛矿钙钛矿纳米板，以实现Rec。2020年展示
要在背光显示器中忠实地再现颜色，需要进行精细的色度工程设计，这对于绿色下变频器来说非常困难，因为人眼对绿色非常敏感。中心面临的挑战是要在525-535 nm的窄范围内实现可微调的绿色发射，同时要保持半峰全宽（FWHM）<25 nm。在这里，介绍了室温离子交换介导的自组装策略，以制备FAPbBr 3（FA = CH（NH 2）2 +）纳米板（NPs）以实现此目标。首先通过自发再沉淀合成二维二维OA 2 PbBr 4（OA为十八烷基胺）NP，然后将其转化为FAPbBr通过OA +到FA +交换的3个NP诱导了HP单层的自组装。甲Ç轴在这个过程中的收缩使得在OA相对大的厚度变化2 PbBr 4的NP，其可以通过简单地改变前体浓度来实现，仅导致在随后的FAPbBr小的厚度变化3级的NP，从而使得能够精细地调谐排放在525–535 nm范围内，FWHM <25 nm，量子产率高达85％。作为下变频器，FAPbBr 3 NP实现了覆盖约95％Rec。的超纯绿色背光。CIE 1931色彩空间中的2020标准。
更新日期：2018-03-12
中文翻译：
室温离子交换介导的自组装，向具有精细可调的超纯绿色排放的甲钙钛矿钙钛矿纳米板，以实现Rec。2020年展示
要在背光显示器中忠实地再现颜色，需要进行精细的色度工程设计，这对于绿色下变频器来说非常困难，因为人眼对绿色非常敏感。中心面临的挑战是要在525-535 nm的窄范围内实现可微调的绿色发射，同时要保持半峰全宽（FWHM）<25 nm。在这里，介绍了室温离子交换介导的自组装策略，以制备FAPbBr 3（FA = CH（NH 2）2 +）纳米板（NPs）以实现此目标。首先通过自发再沉淀合成二维二维OA 2 PbBr 4（OA为十八烷基胺）NP，然后将其转化为FAPbBr通过OA +到FA +交换的3个NP诱导了HP单层的自组装。甲Ç轴在这个过程中的收缩使得在OA相对大的厚度变化2 PbBr 4的NP，其可以通过简单地改变前体浓度来实现，仅导致在随后的FAPbBr小的厚度变化3级的NP，从而使得能够精细地调谐排放在525–535 nm范围内，FWHM <25 nm，量子产率高达85％。作为下变频器，FAPbBr 3 NP实现了覆盖约95％Rec。的超纯绿色背光。CIE 1931色彩空间中的2020标准。
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