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 (CHN)MnBr aims to enhance its structural rigidity and improve its narrow band green light emission properties. The resulting (CHN)ZnBr compound exhibits an identical crystal structure to (CHN)MnBr, indicating the potential for a solid solution of varying Zn and Mn ratios within this structural framework. (CHN)ZnMnBr 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 (CHN)ZnCl and (CHN)ZnX (X = Br, I) are synthesized, with (CHN)ZnBr displaying luminescent color changes dependent on excitation. (CHN)ZnMnBr demonstrates reversible phase transitions and alterations in optical properties. A white light-emitting diode utilizing (CHN)ZnMnBr 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.