Te4+–Ln3+ (Ln: Er, Yb) 共掺杂 Cs2NaInCl6 双钙钛矿的短波红外发射,Chemistry of Materials

当前位置： X-MOL 学术 › Chem. Mater. › 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.)

Te4+–Ln3+ (Ln: Er, Yb) 共掺杂 Cs2NaInCl6 双钙钛矿的短波红外发射
Chemistry of Materials ( IF 7.2 ) Pub Date : 2023-08-15 , DOI: 10.1021/acs.chemmater.3c01413
Habibul Arfin ₁ , Radha Rathod ₂ , Ajinkya Sundarnath Shingote ₁ , K. R. Priolkar ₃ , Pralay K. Santra ₂ , Angshuman Nag ₁

Affiliation

Cs ₂ NaInCl ₆双钙钛矿对环境无害，其宽带隙（∼5.1 eV）使其在紫外、可见光和短波红外（SWIR）区域具有光惰性和光稳定性。有趣的是，八面体配位的In ³⁺晶格位置适合掺杂Er ³⁺和Yb ³⁺等稀土离子，它们可以分别发射1540 nm（0.805 eV）和994 nm（1.247 eV）的短波红外辐射。但镧系元素的光激发是Laporte禁阻，主体要求激发能>5.1 eV。激发和短波红外发射的大斯托克斯位移降低了功率转换效率。在这里，我们将 Te ⁴⁺与 Er ³⁺或 Yb共掺杂³⁺转化为 Cs ₂ NaInCl ₆。由于 5s ² → 5s ¹ 5p ¹电子跃迁， Te ^{4+在约 3.1 eV (400 nm) 的子带隙水平处吸收。}然后，激发的Te ⁴⁺将其能量非辐射地转移至Er ³⁺或Yb ³⁺共掺杂剂。^{Er 3+}或 Yb ³⁺的去激发通过 f-f 电子跃迁分别发射 1540 和 994 nm 的短波红外辐射以及微弱的可见光发射。温度 (8–300 K) 相关的光致发光激发、发射和寿命测量揭示了这些能量转移过程的机制。最后，我们制造了一种发射短波红外辐射的简单荧光粉转换发光二极管 (pc-LED)。

"点击查看英文标题和摘要"

Short-Wave Infrared Emissions from Te4+–Ln3+ (Ln: Er, Yb)-Codoped Cs2NaInCl6 Double Perovskites

A Cs₂NaInCl₆ double perovskite is environmentally benign, and its wide band gap (∼5.1 eV) makes it photoinactive and photostable in the ultraviolet, visible, and short-wave infrared (SWIR) regions. Interestingly, the octahedrally coordinated In³⁺ lattice site is suitable for doping lanthanide ions like Er³⁺ and Yb³⁺, which can emit SWIR radiation at 1540 nm (0.805 eV) and 994 nm (1.247 eV), respectively. But the optical excitation of lanthanides is Laporte forbidden, and the host requires excitation energy >5.1 eV. The large Stokes shift for the excitation and SWIR emission reduces the power conversion efficiency. Here, we codoped Te⁴⁺ with Er³⁺ or Yb³⁺ into Cs₂NaInCl₆. Te⁴⁺ absorbs at the sub-band-gap level at around 3.1 eV (400 nm) because of 5s² → 5s¹5p¹ electronic transitions. Then, the excited Te⁴⁺ transfers its energy nonradiatively to an Er³⁺ or Yb³⁺ codopant. The de-excitation of Er³⁺ or Yb³⁺ through f–f electronic transitions emits SWIR radiation at 1540 and 994 nm, respectively, along with weak visible-light emissions. Temperature (8–300 K) dependent photoluminescence excitation, emission, and lifetime measurements reveal the mechanism of these energy transfer processes. Finally, we fabricated a simple phosphor-converted light-emitting diode (pc-LED) emitting SWIR radiation.

更新日期：2023-08-15

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