紫外偏振敏感的CsPbBr<sub>3</sub>纳米薄膜的可见光发射

吉于今; 楚学影; 董旭; 李金华

doi:10.37188/CO.2022-0152

紫外偏振敏感的CsPbBr₃纳米薄膜的可见光发射

吉于今^{1, 2,},
楚学影^{1, 2, ,},
董旭¹,
李金华^{1, 2}

1.
长春理工大学物理学院, 吉林长春 130022
2.
纳米光子学与生物光子学吉林省重点实验室, 吉林长春 130022

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中图分类号: O469
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出版历程
- 收稿日期: 2022-07-05
- 修回日期: 2022-07-25
- 录用日期: 2022-10-28
- 网络出版日期: 2022-10-28

Visible light emission of ultraviolet polarization sensitive CsPbBr₃ nano-films

doi: 10.37188/CO.2022-0152

JI Yu-jin^{1, 2
,},
CHU Xue-ying^{1, 2
, ,},
DONG Xu¹,
LI Jin-hua^{1, 2}

1.
College of Physics, Changchun University of Science and Technology, Changchun 130022, China
2.
Nanophotonics and Biophotonics Key Laboratory of Jilin Province, Changchun 130022, China

Funds: Department of Science and Technology of Jilin Province (No. 20200201266JC)

More Information

Author Bio:
Ji Yu-jin (1994—), female, born in Yuncheng, Shanxi Province. In 2018, she received her bachelor's degree from Taiyuan Normal University in 2018. Currently, she is mainly engaged in the research of nanomaterial preparation and optical properties. E-mail: yj_ji1113@163.com

Chu Xue-ying (1982—), female, born in Changchun, Jilin Province, Ph.D., associate Professor. In 2011, she obtained her Ph.D. degree from Northeast Normal University. Currently, she is mainly engaged in the research on the preparation of semiconductor nanomaterials and the application of photoelectric properties. E-mail: xueying_chu@cust.edu.cn

Corresponding author: xueying_chu@cust.edu.cn

摘要

摘要:
为了利用可见光学元件实现对紫外偏振光的高性能探测，制备了CsPbBr₃纳米晶/金属线栅复合薄膜，并通过向其表面沉积Al₂O₃钝化层提高了薄膜荧光稳定性，获得了紫外激发下偏振敏感的钙钛矿纳米晶薄膜绿色荧光。测试结果表明，以高温热注入法获得的CsPbBr₃纳米晶为立方晶系结构，形貌呈方形，尺寸约39 nm。以紫外光激发纳米晶胶体溶液可在530 nm处观测到明显的绿色荧光。以自组装方法获得的CsPbBr₃纳米晶/金属线栅复合薄膜荧光发光强度随紫外激发光的偏振方向呈周期性变化，其发光偏振度约为0.54。以原子层沉积技术向此复合薄膜表面沉积Al₂O₃层可明显提高其荧光强度，钝化后复合薄膜的发光偏振度仍可达0.36。以上结果表明，表面钝化和引入金属线栅方法可分别优化钙钛矿纳米晶薄膜的荧光稳定性和荧光偏振度，所获得的紫外偏振敏感的CsPbBr₃纳米晶复合薄膜在紫外偏振探测以及液晶显示等领域具有重要的应用价值。
- CsPbBr₃纳米晶 /
- 表面钝化 /
- 荧光增强 /
- 偏振
Abstract:
In order to detect polarized ultraviolet light by visible optical elements, CsPbBr₃ nanocrystal/metal wire-grid composited films were prepared. The stability of its fluorescence was improved by depositing Al₂O₃ passivation layer. The green fluorescence of polarization-sensitive perovskite nanocrystals film was obtained under ultraviolet exciting light. The results show that the crystal structure of the CsPbBr₃ nanocrystals obtained by hot-injection method have a cubic crystal system structure with a square shape and an average size of about 39 nm. An obvious green fluorescence at about 530 nm were observed under ultraviolet light excitation of the nanocrystal colloidal solution. The fluorescence intensity of the CsPbBr₃ nanocrystal/metal wire-grid composited film obtained by self-assembly changed periodically with the polarization direction of the excited light. The luminous polarization ratio is about 0.54. The fluorescence intensity of this composite film was enhanced when Al₂O₃ was deposited on its surface by atomic layer deposition technology. The polarization ratio of the passivated film can still reach 0.36. The above results show that the fluorescence stability and polarization of perovskite nanocrystals film can be optimized by the surface passivation and the introduction of metal wire-grids, respectively. The obtained ultraviolet polarization sensitive CsPbBr₃ nanocrystals composited film exhibits important application value in the fields of ultraviolet polarization detection and liquid crystal display.
- CsPbBr₃ nanocrystals /
- surface passivation /
- fluorescence enhancement /
- polarization

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图 1 CsPbBr₃纳米晶薄膜的XRD图谱和CsPbBr₃的标准衍射图谱

Figure 1. XRD spectrum (top) of CsPbBr₃ NCs film and standard diffraction pattern (bottom) of CsPbBr₃

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图 2 (a)CsPbBr₃纳米晶TEM图像；(b)纳米晶尺寸分布；(c)CsPbBr₃纳米晶薄膜SEM图像；(d)Al₂O₃钝化后CsPbBr₃纳米晶薄膜SEM图像

Figure 2. (a) TEM images of CsPbBr₃ NCs; (b) the size distribution of the NCs; (c) SEM images of CsPbBr₃ NCs; (d) CsPbBr₃ NCs films after Al₂O₃ passivation

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图 3 (a) CsPbBr₃纳米晶的荧光光谱(实线)与紫外-可见吸收光谱图(虚线); CsPbBr₃纳米晶在(b)自然光和(c)紫外光下的实物照片

Figure 3. (a) UV-Vis absorption spectrum (dotted line) and fluorescence (FL) emission spectrum (solid line) of the CsPbBr₃ NCs; optical photographs of CsPbBr₃ NCs under (b) natural light and (c) UV light

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图 4 (a) Al₂O₃钝化前后纳米晶/金属线栅复合薄膜的荧光光谱图；(b) Al₂O₃钝化前后CsPbBr₃纳米晶/金属线栅复合薄膜荧光强度随紫外光照时间变化关系曲线；(c) Al₂O₃钝化前后CsPbBr₃纳米晶薄膜荧光强度随紫外光照时间变化关系曲线（每个图中虚线对应样品经Al₂O₃钝化后的结果；实线对应样品未沉积Al₂O₃的结果）

Figure 4. (a) FL spectra of nanocrystal/metal wire-grid composite films before and after Al₂O₃ passivation; (b) plots of FL intensity of the CsPbBr₃ NCs/metal wire-grid composited film versus time of irradiation by UV light before and after Al₂O₃ passivation; (c) plots of FL intensity of the CsPbBr₃ NCs film versus time of irradiation by UV light before and after Al₂O₃ passivation (Dotted lines are for samples after Al₂O₃ passivation, and solid lines are for samples before the Al₂O₃ passivation)

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图 5 (a) 偏振荧光光谱测试原理图；(b) 不同激发光偏振角度对应的CsPbBr₃纳米晶/金属线栅复合薄膜偏振荧光光谱图；Al₂O₃钝化前后CsPbBr₃纳米晶/金属线栅复合薄膜荧光强度随激发光角度变化曲线：(c)钝化前，(d)钝化后

Figure 5. (a) Schematic diagram of polarization fluorescence spectroscopy test; (b) FL spectra of CsPbBr₃ NCs/metal wire-grid composited films corresponding to different polarization angles of the exciting light; plots of FL intensities of the CsPbBr₃ NCs/metal wire-grid composited film before (c) and after (d) Al₂O₃ passivation versus the polarization angles of the exciting light

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