| K+掺杂双钙钛矿Cs2AgInCl6的发光性质 |
| Luminescence properties of K+ doped double perovskite Cs2AgInCl6 |
| 作者 | 单位 | E-mail | | 徐锦锃 | 江南大学理学院, 无锡 214122
江苏省轻工光电工程技术研究中心, 无锡 214122 | | | 高辉 | 江南大学理学院, 无锡 214122
江苏省轻工光电工程技术研究中心, 无锡 214122 | 8201807140@jiangnan.edu.cn | | 陈国庆 | 江南大学理学院, 无锡 214122
江苏省轻工光电工程技术研究中心, 无锡 214122 | | | 王可可 | 江南大学理学院, 无锡 214122
江苏省轻工光电工程技术研究中心, 无锡 214122 | | | 胡金辉 | 江南大学理学院, 无锡 214122
江苏省轻工光电工程技术研究中心, 无锡 214122 | |
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| 摘要: 采用固相球磨法制备了K+掺杂双钙钛矿Cs2AgInCl6纳米材料，该方法无需配体辅助，绿色环保。通过X射线衍射和拉曼光谱对晶体结构进行研究，通过激发光谱、发射光谱和时间分辨光谱对其发光性能进行研究。结果表明，Cs2AgInCl6为立方晶体，属于Fm3m空间群，由于宇称禁戒跃迁，其荧光量子产率(PLQY)低，小于0.1%。低于60%的K+掺杂主要取代Ag+的位置，引起Cs2AgInCl6的晶格膨胀，消除了晶格结构的反演对称性，打破了宇称禁戒跃迁，掺杂后Cs2AgInCl6的光致发光强度显著增强。K+的最佳掺杂比例为40%，Cs2Ag0.6K0.4InCl6材料发射中心波长为640 nm，半高宽为180 nm，平均荧光寿命达到29.2 ns，PLQY达到10.5%。当K+掺杂比例超过60%，K+开始取代Cs+的位置，产物发生相变，出现立方相的Cs2-xK1+x-yAgyInCl6和单斜相的Cs2-xK1+xInCl6产物，这些产物由于强电子-声子耦合，非辐射复合占据主导地位。 |
| 关键词: 双钙钛矿 K+掺杂 宇称禁戒跃迁 球磨法 |
| 基金项目: 国家自然科学基金(No.12275344，62375112)资助。 |
| Abstract: K+ doped double perovskite Cs2AgInCl6 nanomaterial was prepared by solid phase ball milling method, which is environmentally friendly without ligands. The crystal structure was studied by X-ray diffraction and Raman spectrum, and the luminescence properties were studied by excitation spectrum, emission spectrum, and time-resolved spectrum. The results show that the Cs2AgInCl6 is a cubic crystal, which belongs to Fm3m space group. Due to parity-forbidden transition, the photoluminescence quantum yield (PLQY) is low, less than 0.1%. When K+ doping is less than 60%, it mainly replaces Ag+, which causes lattice expansion of Cs2AgInCl6, eliminates inversion symmetry of lattice structure, breaks parity forbidden transition, and enhances photoluminescence intensity of Cs2AgInCl6. The optimal doping ratio was 40%, the center wavelength of Cs2Ag0.6K0.4InCl6 was 640 nm, the half-height width was 180 nm, the average fluorescence lifetime was 29.2 ns and the PLQY reached 10.5%. When the doping ratio of K+ exceeds 60%, K+ begins to replace the position of Cs+, which results in the presence of cubic phase Cs2-xK1+x-yAgyInCl6 and monoclinic phase Cs2-xK1+xInCl6. These products are dominated by non-radiative recombination due to strong electron-phonon coupling. |
| Keywords: double perovskite K+ doping parity-forbidden transition ball milling |
| 投稿时间：2023-04-18 修订日期：2023-11-23 |
| 摘要点击次数: 1136 |
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| 徐锦锃,高辉,陈国庆,王可可,胡金辉.K+掺杂双钙钛矿Cs2AgInCl6的发光性质[J].无机化学学报,2024,40(2):405-411. |
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