Enhancing Optical Properties of Zn-Mn Solid Solution Hybrid Halides for Wide Color Gamut Backlight Displays

Hybrid metal halides display a range of optical properties and hold promise for various applications such as solid-state lighting, anti-counterfeiting measures, backlight displays, and X-ray detection. The incorporation of zinc into (C₁₃H₂₆N)₂MnBr₄ aims to enhance its structural rigidity and improve its narrow band green light emission properties. The resulting (C₁₃H₂₆N)₂ZnBr₄ compound exhibits an identical crystal structure to (C₁₃H₂₆N)₂MnBr₄, indicating the potential for a solid solution of varying Zn and Mn ratios within this structural framework. (C₁₃H₂₆N)₂Zn_0.2Mn_0.8Br₄ exhibits significantly enhanced properties, including a photoluminescence quantum yield of 92%, a minimum full width at half maximum of 43 nm, and 85% retention of room temperature emission at 420 K. Additionally, crystals of (C₁₃H₂₆N)₂ZnCl₄ and (C₇H₁₈N)₂ZnX₄ (X = Br, I) are synthesized, with (C₇H₁₈N)₂ZnBr₄ displaying luminescent color changes dependent on excitation. (C₇H₁₈N)₂Zn_0.2Mn_0.8Br₄ demonstrates reversible phase transitions and alterations in optical properties. A white light-emitting diode utilizing (C₁₃H₂₆N)₂Zn_0.2Mn_0.8Br₄ and commercial phosphors exhibited a color gamut of 112.2% of the National Television Standards Committee 1931 Standard. This investigation introduces a stable and highly efficient narrow-band green phosphor suitable for displays.