Nanoimprinted 2D-Chiral Perovskite Nanocrystal Metasurfaces for Circularly Polarized Photoluminescence

被引:47
作者
Mendoza-Carreno, Jose [1 ]
Molet, Pau [1 ]
Otero-Martinez, Clara [2 ]
Alonso, Maria Isabel [1 ]
Polavarapu, Lakshminarayana [2 ]
Mihi, Agustin [1 ]
机构
[1] Inst Mat Sci Barcelona ICMAB CSIC, Campus UAB, Bellaterra 08193, Spain
[2] Univ Vigo, Mat Chem & Phys Grp, Dept Phys Chem, CINBIO, Campus Univ Lagoas, Vigo 36310, Spain
关键词
chirality; circularly polarized photoluminescence; nanoimprinting;
D O I
10.1002/adma.202210477
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The versatile hybrid perovskite nanocrystals (NCs) are one of the most promising materials for optoelectronics by virtue of their tunable bandgaps and high photoluminescence (PL) quantum yields. However, their inherent crystalline chemical structure limits the chiroptical properties achievable with the material. The production of chiral perovskites has become an active field of research for its promising applications in optics, chemistry, or biology. Typically, chiral halide perovskites are obtained by the incorporation of different chiral moieties in the material. Unfortunately, these chemically modified perovskites have demonstrated moderate values of chiral PL so far. Here, a general and scalable approach is introduced to produce chiral PL from arbitrary nanoemitters assembled into 2D-chiral metasurfaces. The fabrication via nanoimprinting lithography employs elastomeric molds engraved with chiral motifs covering millimeter areas that are used to pattern two types of unmodified colloidal perovskite NC inks: green-emissive CsPbBr3 and red-emissive CsPbBr1I2. The perovskite 2D-metasurfaces exhibit remarkable PL dissymmetry factors (g(lum)) of 0.16 that can be further improved up to g(lum) of 0.3 by adding a high-refractive-index coating on the metasurfaces. This scalable approach to produce chiral photoluminescent thin films paves the way for the seamless production of bright chiral light sources for upcoming optoelectronic applications.
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页数:11
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