High-efficiency and ultrastable solvent-free curable perovskite quantum dot inks for microLED and LED backlighting applications
Journal
Nano Energy
Journal Volume
142
ISSN
2211-2855
Date Issued
2025-09
Author(s)
Thi Ngo, Loan
Huang, Yu-Ting
Chang, Cheng-Chieh
Verma, Hemant
Lin, Yen-Huei
Kuo, Ching-Tai
Kaun, Chao-Cheng
Chung, Ren-Jei
Abstract
Metal 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.
Subjects
Fluidic system
Inkjet printing
LED backlighting
Mass production
Micro-LED
Perovskite quantum dot film
Solvent-free perovskite quantum dot ink
SDGs
Publisher
Elsevier BV
Type
journal article