Abstract
Recently, carbon dots (CDs) have gained much attention in optoelectronic fields on account of their superior optical and environmentally friendly properties. Nevertheless, aggregation-induced quenching (AIQ) effect of solid-state CDs and thermal quenching caused by high temperatures severely hinders their further development. Herein, a novel wCDs/BNNS-OH hybrid nanostructure was synthesized by combining blue CDs (bCDs) and yellow CDs (yCDs) to the hydroxylated boron nitride nanosheets (BNNS–OH) surface. The uniform dispersion of CDs in BNNS-OH effectively alleviates the undesirable AIQ effect, and enables CDs/BNNS-OH composites to have color-tunable fluorescence characteristics. The wCDs/BNNS-OH/PVA composite film was obtained by encapsulating wCDs/BNNS-OH into polyvinyl alcohol (PVA). The film exhibits excellent luminescence stability in the air, ultraviolet light, water, and high-temperature environment. Meanwhile, since wCDs/BNNS-OH establishes an effective heat transfer channel in the PVA matrix, the working temperature of CDs in the wCDs/BNNS-OH/PVA film is greatly reduced. Moreover, the prepared wCDs/BNNS-OH/PVA film is flexible enough to retain the photoluminescence intensity unchanged after thousands of bending cycles. This high stability and heat dissipation wCDs/BNNS-OH/PVA composite film will facilitate the application of CDs in flexible and foldable lighting devices.
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