Issue 4, 2024

Nanocrystals of divalent europium-doped CsPbCl3 perovskites: a novel optoelectronic material with dual-emissions

Abstract

In the last five years, significant progress has been achieved in incorporating trivalent lanthanide (Ln3+) ions into CsPbX3 halide perovskite nanocrystals (PeNCs), combining superior optoelectronic performance of semiconductors with abundant Ln3+: 4f–4f transitions. However, doping divalent europium (Eu2+) with parity-allowed 5d–4f transition inside CsPbX3 remains unexplored. Herein, we develop a new class of dual-emitters based on Eu2+-doped CsPbCl3 PeNCs. Narrowband violet emission and broadband orange emission assigned to the respective exciton recombination and Eu2+: 5d → 4f transition are concurrently observed. Steady/transient-state photoluminescence (PL) spectra, time-resolved PL (TRPL) spectra and femtosecond transient absorption (fs-TA) spectra evidence independent dual-emissions without exciton-to-Eu2+ energy transfer, which is attributed to the preferred location of Eu2+ on the surface of CsPbCl3. As a consequence, exciton-longitudinal optical phonon interplay and surface ligand–Eu2+ coupling in the as-prepared Eu:CsPbCl3 PeNCs are verified based on temperature-sensitive spectroscopic analyses, together with first-principles density functional theory (DFT) calculations and crystal-field calculations. These findings provide fundamental insights into the design of novel lanthanide-doped halide perovskite emitters for versatile optoelectronic applications.

Graphical abstract: Nanocrystals of divalent europium-doped CsPbCl3 perovskites: a novel optoelectronic material with dual-emissions

Supplementary files

Article information

Article type
Paper
Submitted
21 Nov 2023
Accepted
13 Dec 2023
First published
13 Dec 2023

J. Mater. Chem. C, 2024,12, 1430-1439

Nanocrystals of divalent europium-doped CsPbCl3 perovskites: a novel optoelectronic material with dual-emissions

H. Yuan, S. Jin, S. Zheng, R. Xie, T. Pang, B. Zhuang, F. Huang and D. Chen, J. Mater. Chem. C, 2024, 12, 1430 DOI: 10.1039/D3TC04288J

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