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Ultrastable Luminescent Organic–Inorganic Perovskite Quantum Dots via Surface Engineering: Coordination of Methylammonium Bromide and Covalent Silica Encapsulation
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-11-15 00:00:00 , DOI: 10.1021/acsami.8b14677 Fan-long Zeng 1 , Mu Yang 1, 2 , Jing-lei Qin 1 , Feng Teng 2 , Yi-quan Wang 1 , Gen-xiang Chen 1 , Da-wei Wang 3 , Hong-shang Peng 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-11-15 00:00:00 , DOI: 10.1021/acsami.8b14677 Fan-long Zeng 1 , Mu Yang 1, 2 , Jing-lei Qin 1 , Feng Teng 2 , Yi-quan Wang 1 , Gen-xiang Chen 1 , Da-wei Wang 3 , Hong-shang Peng 1
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Encapsulation of luminescent perovskite quantum dots (QDs) into a solid matrix has been approved to be an efficient way to improve their stability. In this work, we reported a green encapsulation method to produce ultrastable CH3NH3PbBr3 QDs incorporated into the SiO2 matrix. Specifically, fresh-prepared CH3NH3PbBr3 QDs were covalently embedded into silica by an aqueous sol–gel method assisted with CH3NH3Br, which not only effectively inhibited the water-driven degradation of QDs through surface coordination, but also strongly stabilized the QDs in solid powder via concentration gradient. As far as we know, this silica encapsulation of perovskite QDs in aqueous environments is reported for the first time. Luminescent properties of perovskite QDs during the course of gelation as well as in resulting composite powder were investigated using steady-state and time-resolved spectroscopies, and a 2 wt % QD-doped sample treated with 11.5 mM of CH3NH3Br was demonstrated to be the optimal phosphor. The green-emissive phosphor had a PLQY of 60.3% and a full width at half maxima of ∼25 nm, exhibiting ultrahigh stability tested by cycle heating (120 °C), continuous heating (80 °C, 60 h), and light irradiation (450 nm light, 350 h). The phosphor was readily blended with polymers and applied as a color-converting layer on blue light-emitting diodes.
中文翻译：
通过表面工程的超稳定发光有机-无机钙钛矿量子点：甲基溴化铵和共价二氧化硅包封的配位
将发光钙钛矿量子点（QD）封装到固体基质中已被批准为提高其稳定性的有效方法。在这项工作中，我们报道了一种绿色封装方法，用于生产掺入SiO 2基质中的超稳定CH 3 NH 3 PbBr 3 QD 。具体来说，通过水溶胶-凝胶法辅助CH 3 NH 3将新鲜制备的CH 3 NH 3 PbBr 3 QD共价嵌入二氧化硅中。Br不仅通过表面配位有效地抑制了水驱动的QD降解，还通过浓度梯度强烈稳定了固体粉末中的QD。据我们所知，这种钙钛矿型量子点在水性环境中的二氧化硅包封是首次报道。使用稳态和时间分辨光谱学研究了钙钛矿QD在胶凝过程中以及在所得复合粉末中的发光特性，并用11.5 mM CH 3 NH 3处理了2 wt％的QD掺杂样品。溴被证明是最佳的磷光体。绿色发射磷光体的PLQY为60.3％，半峰全宽约为25 nm，通过循环加热（120°C），连续加热（80°C，60 h）和光照射测试显示出超高稳定性（450 nm的光，350 h）。磷光体很容易与聚合物混合，并作为颜色转换层施加在蓝色发光二极管上。
更新日期：2018-11-15
中文翻译：
通过表面工程的超稳定发光有机-无机钙钛矿量子点：甲基溴化铵和共价二氧化硅包封的配位
将发光钙钛矿量子点（QD）封装到固体基质中已被批准为提高其稳定性的有效方法。在这项工作中，我们报道了一种绿色封装方法，用于生产掺入SiO 2基质中的超稳定CH 3 NH 3 PbBr 3 QD 。具体来说，通过水溶胶-凝胶法辅助CH 3 NH 3将新鲜制备的CH 3 NH 3 PbBr 3 QD共价嵌入二氧化硅中。Br不仅通过表面配位有效地抑制了水驱动的QD降解，还通过浓度梯度强烈稳定了固体粉末中的QD。据我们所知，这种钙钛矿型量子点在水性环境中的二氧化硅包封是首次报道。使用稳态和时间分辨光谱学研究了钙钛矿QD在胶凝过程中以及在所得复合粉末中的发光特性，并用11.5 mM CH 3 NH 3处理了2 wt％的QD掺杂样品。溴被证明是最佳的磷光体。绿色发射磷光体的PLQY为60.3％，半峰全宽约为25 nm，通过循环加热（120°C），连续加热（80°C，60 h）和光照射测试显示出超高稳定性（450 nm的光，350 h）。磷光体很容易与聚合物混合，并作为颜色转换层施加在蓝色发光二极管上。
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