A Facile and Low-Cost Method to Enhance the Internal Quantum Yield and External Light-Extraction Efficiency for Flexible Light-Emitting Carbon-Dot Films

Scientific Reports
Z C JiangC T Yuan

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.

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Citations

Feb 16, 2017·Polymers·Yiqun ZhouRoger M Leblanc
Jun 4, 2020·Nanomaterials·Evgeniia A StepanidenkoAndrey L Rogach
Oct 14, 2016·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Cheng-Wei LiuChi-Tsu Yuan
Feb 5, 2021·Nanomaterials·Evgeniia A StepanidenkoAndrey L Rogach

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Methods Mentioned

BETA
AFM
atomic force microscopy

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