To achieve a significant enhancement in the birefringence of metal phosphite halides via the introduction of π-conjugated cation

Key Points

• The enhancement of birefringence in metal phosphite halides indicates promising optical applications.
• Introducing π-conjugated cations significantly improves the properties of birefringent materials.
• The challenge of designing birefringent materials is addressed through innovative approaches.
• This work highlights the potential of organic-inorganic hybrid systems in optical applications.