3D quantum dot-lens fabricated by stereolithographic printing with in-situ UV curing for lighting and displays. (1st December 2021)

• Record Type: Journal Article
• Authors: Jung, Nian-Ting; Chen, Pin-Ru; Ho, Shih-Jung; Tung, Cheng-Che; Chen, Po-Yu; Chen, Hsueh-Shih
• Is Part Of: Composites. Number 226(2021)
• Publication Date: 2021-12-01
• Subjects: Stereolithography (SLA) -- Quantum dots (QDs) -- Light-emitting diodes (LEDs) -- 3D printing; Composite materials -- Periodicals; Materials science -- Periodicals; Composite materials; Periodicals; Electronic journals; 620.118
• DOI: 10.1016/j.compositesb.2021.109350
• Languages: English
• ISSNs: 1359-8368

Abstract

Abstract: 3D polymer/quantum dots (QDs) nanocomposite QD-lens is fabricated by stereolithography (SLA) 3D printer with in-situ UV curing system. Various UV-curable polymer precursors are mixed with QDs to investigate their printability and optical performance. 2D QD-thin film and 3D QD-lens are printed and attached to a blue InGaN chip to form a light-emitting diode (LED) device. An air gap between the 3D QD-lens and the chip provides more uniform light emission at different angles and better heat dissipation. Compared with conventional QD-on-chip LED, the 3D QD-lens LED operated at 20 mA has ∼100% enhancement of half-lifetime (T50 ) in a standard reliability test. The LED T50 can be further improved 75% by coating the QD-lens with hydrophobic parylene as a gas barrier layer against water and oxygen. By mixing both green- (G-) and red- (R-) QDs in the 3D QD-lens, a white light-emitting 3D QD-lens LED is demonstrated to possess a color gamut of ∼130% NTSC standard. Graphical abstract: Image 1