DMF-mediated polycrystalline phase transition of Cd-based perovskites: dual-emission tuning for temperature sensing and single-component white LEDs

Abstract

Phase transition dynamics in perovskite polycrystalline materials present intriguing scientific phenomena, yet achieving precise phase selection and synthesis remains a significant challenge. Herein, we ‌demonstrate controlled synthesis‌ of three distinct phases within the Cs-Cd-Cl system ‌through a DMF-mediated co-precipitation method‌. By systematically varying‌ the volume ratio of DMF to HCL (0, 1, and 1.5), high-purity CsCdCl3, Cs3Cd2Cl7, and Cs2CdCl4 phases were ‌successfully obtained via DMF solvent modulation‌. By introducing Pb2+, the obtained Cd-based perovskites have a high photoluminescence efficiency, demonstrating the cyan-blue emissions centered at 507, 436 and 450 nm, respectively. Notably, Pb2+, Mn2+ co-doped Cs3Cd2Cl7 exhibits dual-emission peaking at 436 nm and 584 nm, ‌attributed to efficient energy transfer from Pb²⁺ to Mn²⁺, enabling spectral tuning from blue to orange band. Interestingly, Cs3Cd2Cl7:1%Pb2+, 1%Mn2+ demonstrates an anomalous anti-thermal quenching behavior suitable for fluorescence intensity ratio (FIR) based temperature sensing, achieving the maximum relative sensitivity (Sr) of 3.40% K−1 (at 298 K) and absolute sensitivity (Sa) of 4.45% K−1. Furthermore‌, the dual-emission phosphors show the tunable capabilities for fabricating both warm-white and cool-white LEDs. This work proposes a novel strategy for manipulating photoluminescence properties through polycrystalline phase transformation in Cs-Cd-Cl systems, while revealing significant potentials in advanced optical thermometry and single-component white-light LED devices.

Supplementary files

Article information

Article type
Paper
Submitted
13 May 2025
Accepted
01 Jul 2025
First published
02 Jul 2025

J. Mater. Chem. C, 2025, Accepted Manuscript

DMF-mediated polycrystalline phase transition of Cd-based perovskites: dual-emission tuning for temperature sensing and single-component white LEDs

W. Dong, M. Shi, W. Dong, H. He, H. Jiang, Z. Yang, J. Qiu and T. Han, J. Mater. Chem. C, 2025, Accepted Manuscript , DOI: 10.1039/D5TC01897H

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