Thi Ngo, LoanLoanThi NgoHuang, Yu-TingYu-TingHuangChang, Cheng-ChiehCheng-ChiehChangVerma, HemantHemantVermaLin, Yen-HueiYen-HueiLinKuo, Ching-TaiChing-TaiKuoYING-CHIH LIAOKaun, Chao-ChengChao-ChengKaunChung, Ren-JeiRen-JeiChungLiu, Ru-ShiRu-ShiLiu2025-07-182025-07-182025-09https://scholars.lib.ntu.edu.tw/handle/123456789/730743Metal lead halide perovskite quantum dots (PeQDs) exhibit exceptional optoelectronic properties, showing promise as components for solar cells, lighting, display, and anticounterfeiting devices. However, the instability of PeQDs, along with synthesis and storage methods that rely on hazardous solvents, has limited their potential for commercial applications. To overcome these obstacles, we introduce a solvent-free method for fabricating high-quality green and red CsPbX3 PeQD (X = Br, I) ink. Using a fluidic system, we first obtained super-high photoluminescence quantum yield PeQDs (92 % for red CsPb(Br,I)3, and nearly 100 % for green CsPbBr3 PeQDs). The uniform nonsolvent PeQD ink is fabricated by modifying the as-formed PeQD surface with a mixture of trimethoxysilane and 3-(trimethoxysilyl)propyl methacrylate silane coupling agents to form PeQDs@silane, then dispersing the PeQDs@silane in a UV-curable 1,6-hexanediol diacrylate monomer. Our solvent-free PeQD ink exhibits bright and stable green and red emissions with long-term stability, retaining 100 % PL intensity after 115 days for CsPbBr3 and 78 days for CsPb(Br,I)3. The environment-friendly ink enables highly uniform and bright films for LED backlighting and patterns for micro-LED applications. With color coordinates near the red and green reference values, the PeQD films demonstrate a remarkable 100.28 % color gamut coverage in comparison with Rec. 2020. This scalable and environmentally friendly method provides a safer alternative than conventional solvent-based PeQD ink.enFluidic systemInkjet printingLED backlightingMass productionMicro-LEDPerovskite quantum dot filmSolvent-free perovskite quantum dot ink[SDGs]SDG7journal article10.1016/j.nanoen.2025.111230