Sixiang Wang,Yichang Wang,DaeHo Yoon,Tianrong Li,Yuhua Wang
Green light conversion materials with small particle sizes and high luminous quality are essential for high-resolution display technology, such as Mini-LEDs and Micro-LEDs. Here, we demonstrate an effective strategy to prepare a sub-micrometer green phosphor via doping Mn2+ in a small-sized organic–inorganic hybrid Zn(II) bromide (C8H20N)2ZnBr4. Among a series of prepared (C8H20N)2Zn1−xMnxBr4 (x = 0–1.0), (C8H20N)2Zn0.7Mn0.3Br4 showed a particle size of around 700 nm, an emission peak centered at 517 nm with a full width at half maximum of 47 nm, a photoluminescence quantum yield of about 80%, and a stabilized photoluminescence intensity with a slight increase under continuous UV-light illumination over a 30 day test range. A [MnBr4]2− tetrahedron was effectively split by a massive tetraethylammonium cation (C8H20N)+ and [ZnBr4]2− tetrahedron unit in the zero-dimension structure, which was considered responsible for reducing the electron–phonon coupling of Mn2+, accelerating the leap process of [MnBr4]2−, and enhancing the optical and thermal stability of emitting centers. These results indicated that (C8H20N)2Zn0.7Mn0.3Br4 is a valuable candidate for Mini-LEDs and Micro-LEDs.
Pure red mixed halide CsPbBr3−xIx perovskite nanocrystals (NCs) exhibit a high photoluminescence quantum yield (PLQY) and narrow full width at half maximum (FWHM), but there are phase stability issues that hinder their application in displays. In this work, we propose pure red CsPbBr0.96I2.04/SiO2 core/shell NCs by using (3-aminopropyl)triethoxysilane as the surface ligand and silicon source via a hot-injection and in situ hydrolytic process. The CsPbBr0.96I2.04/SiO2 NCs not only show excellent optical properties with a near-unity PLQY but also exhibit high stability against moisture, blue light, and heat. Pure red CsPbBr0.96I2.04/SiO2 NC inks were prepared by dispersing CsPbBr0.96I2.04/SiO2 NCs into a mixed solvent of toluene and dodecane and used to inkjet print NC color conversion films (NC-CCFs) with excellent luminescence uniformity and high stability. Finally, white-emitting Mini-LEDs were fabricated by combining pure red CsPbBr0.96I2.04/SiO2 NC-CCFs with green CsPbBr3/SiO2 NC-CCFs and blue Mini-LED chips, showing a high external quantum efficiency (EQE) of 24.8% and an ultrawide color gamut of 132.58% NTSC and 99.2% Rec. 2020 standards. This demonstrates the potential of pure red CsPbBr0.96I2.04/SiO2 NCs for Mini-LED backlights.
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