Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite
Stress-Induced Photoluminescence Change of Monolayer Nanosheet Prepared by Delamination of Aurivillius-Phase Layered Perovskite
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DOI：
10.1021/acs.chemmater.3c00466
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发表时间：
2023-04
影响因子：
8.6
通讯作者：
Keisuke Awaya;S. Ida
中科院分区：
文献类型：
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作者：
Keisuke Awaya;S. Ida
对单层Bi3+-取代data2o72 - (A= Ca, Sr, Bi0.5Na0.5)的光致发光性能进行了全面的研究。在紫外光照（λex= 250 ~ 340 nm）下，a - ta - o钙钛矿框架中的Bi3+中心作为发光中心（λmax= 470 ~ 520 nm）。通过对Bi2ATa2O9(（Bi2O2)(ATa2O7)）、质子化Bi2ATa2O9（H2ATa2O7·xH2O）和独立ata2o72纳米片膜中Bi3+的光致发光光谱的比较，发现层间阳离子种类对发射带和激发带的位置有很大的影响。结果表明，由于单层ata2o72纳米片的最终厚度为1.1 ~ 1.2 nm，其光致发光性能对Bi3+周围电场的变化非常敏感。为了进一步探讨Bi3+取代ata2o72纳米片的机械应力与Bi3+发射带之间的关系，比较了独立ata2o72纳米片膜的光致发光和拉曼光谱随曲率半径的变化。本研究证实了二维纳米材料有助于进一步理解含铋无机材料中的机械致色现象。
A comprehensive investigation was performed on the photoluminescence properties of monolayer Bi3+-substitutedATa2O72–(A= Ca, Sr, Bi0.5Na0.5). The Bi3+center in theA–Ta–O perovskite framework functioned as a luminescence center (λmax= 470–520 nm) under UV-light illumination (λex= 250–340 nm). Comparison of the photoluminescence spectra of Bi3+in several types of layeredATa2O72–structures, including Bi2ATa2O9((Bi2O2)(ATa2O7)), protonated Bi2ATa2O9(H2ATa2O7·xH2O), and free-standingATa2O72–nanosheet membranes, revealed that the positions of the emission and excitation bands were greatly influenced by the interlayer cation species. The results implied that the photoluminescence properties of Bi3+inATa2O72–were sensitive to changes in the electric field surrounding Bi3+because of the ultimate thinness of the monolayerATa2O72–nanosheets (1.1–1.2 nm). To further explore the relationship between mechanical stress in Bi3+-substitutedATa2O72–nanosheets and the emission band of Bi3+, changes in the photoluminescence and Raman spectra in response to the curvature radius of free-standingATa2O72–nanosheet membranes were compared. The present study confirmed that two-dimensional nanomaterials could help further the understanding of mechanochromic phenomena in Bi-containing inorganic materials.