通过引入分离发射中心实现三维 CsCdCl3 单晶的高效发射,Inorganic Chemistry

当前位置： X-MOL 学术 › Inorg. Chem. › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

通过引入分离发射中心实现三维 CsCdCl3 单晶的高效发射
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-10-25 , DOI: 10.1021/acs.inorgchem.2c03277
Yan Zhang ₁ , Lei Zhou ₁ , Dan Li ₁ , Hui Li ₁ , Lei Zhang ₁ , Wei Shen ₁ , Ming Li ₁ , Rongxing He ₁

Affiliation

迄今为止，由于激子的空间无限制性，具有低激子结合能的三维（3D）钙钛矿单晶通常具有较差的光致发光（PL）性能。在这项工作中，已经开发出具有来自自陷激子 (STEs) 的多次发射的3D CsCdCl _{3单晶，不出所料，其 PL 量子产率 (PLQY) 约为 4.8%。}为了提高发光效率，将Mn ²⁺和Sn ²⁺分别引入晶格作为掺杂剂。通过将 Mn ²⁺离子嵌入 CsCdCl ₃中，长 Mn-Mn 距离使所得材料能够从 d-d 轨道跃迁 ( ⁴T ₁ – ⁶ A ₁ ) 的 Mn ²⁺。有趣的是，嵌入的 Sn ²⁺引发了类似 Jahn-Teller 的 STEs 的形成，从而引发了随后的深红色发射，PLQY 约为 28.22%，这对于 3D 块状钙钛矿来说是相当高的。如此显着的 PL 效率归因于 CsCdCl ₃的独特键合模式，它促进了 Sn 5s ²孤对电子的表达。^{此外，还用Mn 2+}掺杂的CsCdCl ₃制造了白光发光二极管（WLED），以显示其在照明应用中的潜力。这项工作为提高块状 3D 钙钛矿材料的发光性能开辟了一条新途径。

"点击查看英文标题和摘要"

Realizing Efficient Emission in Three-Dimensional CsCdCl3 Single Crystals by Introducing Separated Emitting Centers

Hitherto, three-dimensional (3D) perovskite single crystals with a low exciton binding energy generally possess inferior photoluminescence (PL) performance due to the spatially unconfined nature of excitons. In this work, 3D CsCdCl₃ single crystals with multiple emissions from self-trapped excitons (STEs) have been developed, which unsurprisingly exhibit a discouraging PL quantum yield (PLQY) of ∼4.8%. To improve the luminescence efficiency, Mn²⁺ and Sn²⁺ are introduced into the lattice as dopants, respectively. By embedding Mn²⁺ ion into CsCdCl₃, the long Mn–Mn distance enables the resultant material to produce an intense orange emission (∼100% PLQY) from the d–d orbital transition (⁴T₁–⁶A₁) of Mn²⁺. Intriguingly, the embedded Sn²⁺ triggers the formation of Jahn–Teller-like STEs that induces a subsequent deep red emission with a PLQY of ∼28.22%, which is quite high for 3D bulk perovskites. Such a remarkable PL efficiency is attributed to the distinctive bonding mode of CsCdCl₃ that encourages the expression of the Sn 5s² lone pair. Furthermore, a white-light-emitting diode (WLED) is also fabricated with Mn²⁺-doped CsCdCl₃ to show its potential in lighting application. This work paves a new avenue to improve the luminescence performance of bulk 3D perovskite materials.

更新日期：2022-10-25

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南