|
| 基于二维钙钛矿的复合型白光LED研究 |
| Study on compound white LED based on two-dimensional perovskite |
| 投稿时间：2023-03-03 |
| DOI：10.3969/j.issn.1005-5630.202303030037 |
| 中文关键词: 二维钙钛矿 自陷激子 宽谱发射 白光发射 LED |
| 英文关键词:two-dimensional perovskite STEs broad spectrum emitting white-light emission LED |
| 基金项目:上海市自然科学基金 (20ZR437400) |
|
| 摘要点击次数: 1842 |
| 全文下载次数: 1266 |
| 中文摘要: |
| 二维钙钛矿的宽带发射引起了人们对单组分白光二极管的兴趣。二维钙钛矿(PEA)2PbBr2Cl2和(C6H18N2O2)PbBr4具有软晶格特性，因而能产生很强的光声耦合作用，使得受激产生的电子–空穴对（激子）很容易引起晶格畸变从而被晶格捕获，形成自陷激子（self-trapping excitons，STEs），发射出全光谱白光。研究表明：这2种材料的半高全宽可以达到232 nm和194 nm；斯托克斯位移分别为182 nm和198 nm；荧光寿命为9.812 ns和13.465 ns。它们在CIE色度图上坐标分别为（0.36，0.40）和（0.40，0.44），显色指数（color rendering indexes，CRI）为86.93和82.23。基于这2种钙钛矿，结合商用的紫外LED，制成的复合型LED色温在5000 K左右，为设计单组分白光二极管提供了新的思路和方法。 |
| 英文摘要: |
| Broadband emission of two-dimensional perovskite has aroused interest in single-component white-light-emitting diodes. In this paper, we use the soft lattice properties of two-dimensional perovskite (PEA)2PbBr2Cl2 and (C6H18N2O2)PbBr4, which have strong photoacoustic coupling effect. The photo-excited electron-hole pair (exciton) is easy to cause lattice distortion and thus be captured by the lattice, forming self-trapping excitons (STEs), which can emit full spectrum white light. The results show that the half-height and full width of the two materials can reach 232 nm and 194 nm, the stokes shift is 182 nm and 198 nm respectively, and the fluorescence lifetime is 9.812 ns and 13.465 ns. Their coordinates on chrominance diagrams (CIE) are (0.36, 0.40) and (0.40, 0.44), color rendering indexes (CRI) are 86.93 and 82.23. Based on these two kinds of perovskites, combined with commercial UV LED, the composite LED color temperature is about 5000 K, providing a new understanding and perspective for the design of single-component white-light-emitting diodes. |
| HTML 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
