Luminescent ferroelectrics have attracted intense attention in flat-panel display, field emission display (FED), and vacuum fluorescent displays, which mainly focus on the multicomponent systems of rare-earth doping ferroelectric ceramics. However, ferroelectrics coexisting with strong single-component white-light emission still remain unexplored.
In a study published in Adv. Funct. Mater., a research team led by Prof. LUO Junhua and Prof. SUN Zhihua from Fujian Institute of Research on the Structure of Matter (FJIRSM) of Chinese Academy of Sciences firstly reported a white-light luminescent ferroelectric (C4H12N)4PbCl4 with high color rendering index, featuring unique two-dimensional (2D) layered perovskite architecture.
Researchers found that the orientation of organic cations and the significant structural distortion of PbCl6 synergistically induce the generation of large spontaneous polarizations.
Moreover, they found that the ferroelectric material exhibits broadband white light emission under UV excitation with a color rendering index as high as 86.
Mechanism studies indicated that the white-light emission is derived from the strong electron–phonon coupling associated with the structural distortion of PbCl6 octahedra.
As a first white-light luminescent ferroelectric, (C4H12N)4PbCl4 showed the unprecedented coexistence of ferroelectricity and broadband white-light emission in a single component 2D perovskite hybrid.
This study paves a way to design new hybrid ferroelectrics for multifunctional application in the photoelectronic field.
LUO Junhua
Fujian Institute of Research on the Structure of Matter
E-mail: jhluo@fjirsm.ac.cn
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