Chang Yi-Hsuan, Lin Jou-Chun, Chen Yi-Chia, Kuo Tsung-Rong, Wang Di-Yan
Department of Chemistry, Tunghai University, Taichung, 40704, Taiwan.
Graduate Institute of Nanomedicine and Medical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei, 11031, Taiwan.
Nanoscale Res Lett. 2018 Aug 22;13(1):247. doi: 10.1186/s11671-018-2664-5.
In hybrid organic-inorganic and all-inorganic metal halide perovskite nanomaterials, two-dimensional (2D) Ruddlesden-Popper (RP) perovskites have become one of the most interesting materials because of tunable bandgaps varied with the layer thickness, effective modulation of the electron-hole confinement, and high stability. Here, we report a one-pot synthesis of 2D RP perovskite (BA)(MA)PbX (BA = 1-butylammonium, MA = methylammonium, X = Br or I) quantum dots (QDs) with an average size of 10 nm at room temperature. The (BA)(MA)PbBr (Br series) QDs and (BA)(MA)PbI (I series) QDs exhibited tunable emitting spectrum in the range of 410-523 nm and 527-761 nm, respectively, with full width at half maximum (FWHM) of 12-75 nm. The emission color was tuned by the ratio of MA and halide. The photoluminescence quantum yield of 2D perovskite QDs reached 48.6% with more thermodynamic stability in comparison with 3D MAPbX QDs. Overall results indicated that developing a solution synthesis for 2D RP perovskite QDs with great optical properties paves the way toward future optoelectronic devices and perovskite quantum dot photovoltaics.
在有机-无机杂化和全无机金属卤化物钙钛矿纳米材料中，二维（2D）Ruddlesden-Popper（RP）钙钛矿因其带隙随层厚度可调、电子-空穴限域有效调制以及高稳定性而成为最受关注的材料之一。在此，我们报道了一种在室温下一锅法合成平均尺寸为10 nm的二维RP钙钛矿（BA）（MA）PbX（BA = 1-丁基铵，MA = 甲基铵，X = Br或I）量子点（QDs）的方法。（BA）（MA）PbBr（Br系列）量子点和（BA）（MA）PbI（I系列）量子点分别在410 - 523 nm和527 - 761 nm范围内呈现可调发射光谱，半高宽（FWHM）为12 - 75 nm。发射颜色通过MA与卤化物的比例进行调节。与三维MAPbX量子点相比，二维钙钛矿量子点的光致发光量子产率达到48.6%，且具有更高的热力学稳定性。总体结果表明，开发具有优异光学性能的二维RP钙钛矿量子点的溶液合成方法为未来的光电器件和钙钛矿量子点光伏技术铺平了道路。
