title: A Facile and Low-Cost Method to Enhance the Internal Quantum Yield and External Light-Extraction Efficiency for Flexible Light-Emitting Carbon-Dot Films.
abstract: Solution-processed, non-toxic carbon dots (CDs) have attracted much attention due to their unique photoluminescence (PL) properties. They are promising emissive layers for flexible light-emitting devices. To this end, the CDs in pristine aqueous solutions need to be transferred to form solid-state thin films without sacrificing their original PL characteristics. Unfortunately, solid-state PL quenching induced by extra non-radiative (NR) energy transfer among CDs would significantly hinder their practical applications in optoelectronics. Here, a facile, low-cost and effective method has been utilized to fabricate high-performance CD/polymer light-emitting flexible films with submicron-structured patterns. The patterned polymers can serve as a solid matrix to disperse and passivate CDs, thus achieving high internal quantum yields of 61%. In addition, they can act as an out-coupler to mitigate the waveguide-mode losses, approximately doubling the external light-extraction efficiency. Such CD/polymer composites also exhibit good photo-stability, and thus can be used as eco-friendly, low-cost phosphors for solid-state lighting.
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: Z C
authors.initials: ZC
authors.lastname: Jiang
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: T N
authors.initials: TN
authors.lastname: Lin
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: H T
authors.initials: HT
authors.lastname: Lin
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: M J
authors.initials: MJ
authors.lastname: Talite
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: T T
authors.initials: TT
authors.lastname: Tzeng
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: C L
authors.initials: CL
authors.lastname: Hsu
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: K P
authors.initials: KP
authors.lastname: Chiu
authors.affiliation: Department of Biomedical Engineering, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: C A J
authors.initials: CA
authors.lastname: Lin
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: J L
authors.initials: JL
authors.lastname: Shen
authors.affiliation: Department of Physics, Chung Yuan Christian University, Chung Li, 320, Taiwan.
authors.forename: C T
authors.initials: CT
authors.lastname: Yuan
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