作者：

Jia-Lin Pan¹, Wan-Shan Shen¹, Hua-Hui Li¹, Lei Huang¹, Zong-Shuo Liu¹, Zhao-Kui Wang¹, Bao-Quan Sun¹, Ya-Kun Wang¹*,and Liang-Sheng Liao^1,2*

单位：

¹Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, State Key Laboratory of Bioinspired Interfacial Materials Science, Soochow University, Suzhou 215123, China.

²Macao Institute of Materials Science and Engineering, Macau University of Science and Technology, Taipa, Macau, SAR 999078, China.

摘要：

Lanthanide-alloyed perovskite quantum dots (QDs, Yb³⁺: CsPb(Cl_1-xBr_x)₃) are promising in near-infrared light-emitting diodes (NIR-LEDs) for theoretically ≈200% photoluminance quantum yield because of quantum-cutting effect, where one high-energy photon is used as a source to generate two low-energy photons. However, the inferior stability of Yb³⁺: CsPb(Cl_1-xBr_x)₃ remains a big challenge. It is posited that vacancy-defect complexes during lanthanide ions alloying are the driving force behind the collapse of octahedral geometry. Here, a coordination agent compensation plus an in situ doping strategy is developed to address the incompatibility between high NIR emission and good stability. This is achieved by combining the sodium ion to fill the vacancy and a coordinating agent (pyridine-2-carboxylic acid) for passivation. This enabled the treated QD films to have a magnitude of order decreased deep trap density compared to the control. Besides, the treated composite exhibits a sixfold increase in NIR intensity and tenfold lower trap states. Using the optimized Yb³⁺: CsPb(Cl_1-xBr_x)₃, NIR-LEDs are fabricated and achieved an external quantum efficiency of 8.2%, one of the highest values among NIR LEDs with emission >950 nm. Furthermore, these LEDs exhibit a 30-fold increase in operational stability compared to the control.

影响因子：

19.0

分区情况：

一区

链接：

https://doi.org/10.1002/adfm.202507724