Chen Wei, Liu Haiyu, Fan Ruiqing, Wang Ping, Sun Tiancheng, Yang Yulin
MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering , Harbin Institute of Technology , Harbin 150001 , P. R. China.
ACS Appl Mater Interfaces. 2020 Feb 26;12(8):9851-9857. doi: 10.1021/acsami.9b23617. Epub 2020 Feb 12.
Improving the stability of perovskite quantum dots and adjusting their optical properties are essential for their application in advanced optoelectronic equipment. We provide a simple synthetic method to hybridize perovskite quantum dots and metal-organic frameworks (MOFs) into a polymer matrix. The hybrid material is made by encapsulating perovskite CHNHPbBr quantum dots in lanthanide-based metal-organic frameworks. A series of lanthanide-based metal-organic frameworks (LnMOFs), namely, [Ln(tpob)(DMF)(HO)] (, Ln = Nd, Sm, Eu, Gd, Tb, Dy, Htpob = 1,3,5-tris(4-carbonylphenyloxy)benzene), have been synthesized under solvothermal conditions and fully characterized. s display a three-dimensional (3D) network with central-symmetric [Eu(COO)] structural building units (SBUs) linked by one-dimensional (1D) chains. hybrids were developed through a three-step process, in which the precursor was formed by immersing the crystal synthesized in the first step into a PbBr solution; then the composite materials could form quickly when CHNHBr was added to the precursor. Therefore, the hybrid composite material exhibits luminescent properties related to the excitation wavelength in the form of powders or thin films. In addition, the photoluminescence of the composite can be improved and maintained for a long time after it is introduced into the poly(methyl methacrylate) (PMMA) matrix. Moreover, the emission peak based on the perovskite quantum dots can still maintain about 85% of the original intensity after being left for 30 days. Also, the obtained PMMA films can achieve tunable emission from red to green.
提高钙钛矿量子点的稳定性并调节其光学性质对于其在先进光电器件中的应用至关重要。我们提供了一种简单的合成方法，将钙钛矿量子点与金属有机框架（MOF）杂化到聚合物基质中。这种杂化材料是通过将钙钛矿CHNHPbBr量子点封装在镧系金属有机框架中制成的。一系列镧系金属有机框架（LnMOF），即[Ln(tpob)(DMF)(HO)]（Ln = Nd、Sm、Eu、Gd、Tb、Dy，Htpob = 1,3,5-三（4-羰基苯氧基）苯），已在溶剂热条件下合成并得到充分表征。它们呈现出一种三维（3D）网络，具有由一维（1D）链连接的中心对称[Eu(COO)]结构构筑单元（SBU）。杂化物是通过三步过程制备的，其中前体是通过将第一步合成的晶体浸入PbBr溶液中形成的；然后当将CHNHBr添加到前体中时，复合材料可以快速形成。因此，这种杂化复合材料以粉末或薄膜的形式表现出与激发波长相关的发光特性。此外，该复合材料的光致发光在被引入聚甲基丙烯酸甲酯（PMMA）基质后可以得到改善并长时间保持。而且，基于钙钛矿量子点的发射峰在放置30天后仍可保持约85%的原始强度。此外，所获得的PMMA薄膜可以实现从红色到绿色的可调发射。
