首页|Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers
Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers
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Thermal management of nanoscale quantum dots(QDs)in light-emitting devices is a long-lasting challenge.The exist-ing heat transfer reinforcement solutions for QDs-polymer composite mainly rely on thermal-conductive fillers.However,this strategy failed to deliver the QDs'heat generation across a long distance,and the accumulated heat still causes con-siderable temperature rise of QDs-polymer composite,which eventually menaces the performance and reliability of light-emitting devices.Inspired by the radially aligned fruit fibers in oranges,we proposed to eliminate this heat dissipation challenge by establishing long-range ordered heat transfer pathways within the QDs-polymer composite.Ultrahigh molecular weight polyethylene fibers(UPEF)were radially aligned throughout the polymer matrix,thus facilitating mas-sive efficient heat dissipation of the QDs.Under a UPEF filling fraction of 24.46 vol%,the in-plane thermal conductivity of QDs-radially aligned UPEF composite(QDs-RAPE)could reach 10.45 W m-1 K-1,which is the highest value of QDs-poly-mer composite reported so far.As a proof of concept,the QDs'working temperature can be reduced by 342.5 ℃ when illuminated by a highly concentrated laser diode(LD)under driving current of 1000 mA,thus improving their optical per-formance.This work may pave a new way for next generation high-power QDs lighting applications.
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