Strain-Negligible Eu2+ Doping Enabled Color-Tunable Harsh Condition-Resistant Perovskite Nanocrystals for Superior Light-Emitting Diodes

Mengdie Jin; Zhichao Zeng; Hao Fu; Siyuan Wang; Zongyou Yin; Xinyun Zhai; Qian Zhang; Yaping Du

doi:10.1021/jacsau.2c00593

Strain-Negligible Eu²⁺ Doping Enabled Color-Tunable Harsh Condition-Resistant Perovskite Nanocrystals for Superior Light-Emitting Diodes

JACS Au. 2022 Dec 21;3(1):216-226. doi: 10.1021/jacsau.2c00593. eCollection 2023 Jan 23.

Authors

Mengdie Jin¹, Zhichao Zeng¹, Hao Fu², Siyuan Wang¹, Zongyou Yin³, Xinyun Zhai¹, Qian Zhang⁴, Yaping Du¹

Affiliations

¹ Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Smart Sensing Interdisciplinary Science Center, School of Materials Science and Engineering & National Institute for Advanced Materials, Nankai University, Tianjin 300350, P.R. China.
² College of Chemistry, Nankai University, Tianjin 300071, P.R. China.
³ Research School of Chemistry, Australian National University, Canberra ACT 2601, Australia.
⁴ State Key Laboratory of Eco-Hydraulics in Northwest Arid Region, Department of Applied Chemistry, Xi'an University of Technology, Xi'an 710048, P.R. China.

Abstract

Cesium lead halide (CsPbX₃, X = Br, Cl, I) perovskite nanocrystals (NCs) possess tunable band gaps across the entire visible spectral range and are promising for various optoelectronic device applications. However, poor performance in adverse conditions limits their further development in practical optoelectronics. Herein, highly stable perovskite NCs are developed by doping europium(II) (Eu²⁺) into the B-site of CsPbBr₃ with negligible lattice distortion/strain. Eu²⁺-doped CsPbBr₃ NCs exhibit tunable green-to-cyan emissions, high photoluminescence quantum yield, and good resistance to harsh conditions, including ultraviolet irradiation, erosion of moisture, and corrosion of polar solvent molecules. In particular, the thermal stability of CsPbBr₃ NCs after Eu²⁺ doping is greatly enhanced under continuous heating in air, while exhibiting the emissions of Eu²⁺. Furthermore, a Eu²⁺-doped CsPbBr₃ NC-based cyan light-emitting diode is fabricated, which exhibits narrow exciton emission driven under different current densities. This work would open the avenue to develop the rational lanthanide ion doping strategy for further advancing perovskite nanomaterials toward practical applications.