Solvent-Free Grinding Synthesis of Hybrid Copper Halides for White Light Emission

Dehai Liang; Zhe Sun; Shirong Lu; Jinrong Zhao; Yong Zhou; Kang An; Zhigang Zang

doi:10.1021/acs.inorgchem.3c00352

Solvent-Free Grinding Synthesis of Hybrid Copper Halides for White Light Emission

Inorg Chem. 2023 May 15;62(19):7296-7303. doi: 10.1021/acs.inorgchem.3c00352. Epub 2023 May 3.

Authors

Dehai Liang¹, Zhe Sun¹, Shirong Lu², Jinrong Zhao¹, Yong Zhou¹, Kang An¹, Zhigang Zang¹

Affiliations

¹ Key Laboratory of Optoelectronic Technology & Systems (Ministry of Education), Chongqing University, Chongqing 400044, China.
² Department of Material Science and Technology, Taizhou University, Taizhou 318000, China.

PMID: 37134262
DOI: 10.1021/acs.inorgchem.3c00352

Abstract

Lead-free metal halides (LMHs) have recently attracted numerous attention in solid-state lighting due to their unique structures and outstanding optoelectronic properties. However, conventional preparation processes with the utilization of toxic organic solvents and high temperatures seem to impede commercial applications of LMHs. In this work, we successfully synthesize Cu⁺-based metal halides (TMA)₃Cu₂Br_5-xCl_x (TMA: tetramethylammonium) with high photoluminescence quantum yields (PLQYs) via a solvent-free mechanical grinding method. By changing the ratio of halide ions (Cl^- and Br^-) in precursors, the emission wavelength of the prepared (TMA)₃Cu₂Br_5-xCl_x can be tuned from 535 to 587 nm, which are employed as emitters in the fabrication of white-light-emitting diodes (WLEDs). The achieved WLEDs exhibit a high color rendering index value of 84 and standard Commission Internationale de l'Éclairage (CIE) coordinates of (0.324, 0.333). This feasible and solvent-free preparation strategy not only promotes the mass production of LMHs but also highlights the promising potential for efficient solid-state illumination.