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Yang X, Zhang XF, Zhang TX et al. Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers. Opto-Electron Adv 7, 240036 (2024). doi: 10.29026/oea.2024.240036
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Article Open Access
Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers
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Abstract
Thermal management of nanoscale quantum dots (QDs) in light-emitting devices is a long-lasting challenge. The existing 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 considerable 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 massive 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-polymer composite reported so far. As a proof of concept, the QDs’ working temperature can be reduced by 342.5 °C when illuminated by a highly concentrated laser diode (LD) under driving current of 1000 mA, thus improving their optical performance. This work may pave a new way for next generation high-power QDs lighting applications.-
Keywords:
- quantum dots /
- UHMWPE fibers /
- radial alignment /
- heat dissipation /
- light-emitting devices
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References
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Supplementary information for Paving continuous heat dissipation pathways for quantum dots in polymer with orangeinspired radially aligned UHMWPE fibers 
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Yang X, Zhang XF, Zhang TX et al. Paving continuous heat dissipation pathways for quantum dots in polymer with orange-inspired radially aligned UHMWPE fibers. Opto-Electron Adv 7, 240036 (2024). doi: 10.29026/oea.2024.240036
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Figure 1.
Fabrication process of QDs-RAPE. (a) SEM image of fruit fibers of oranges and diagram illustration of water transportation with the radially aligned fruit fibers networks. (b) Light conversion and heat generation process of QDs and phosphor. (c) Schematic of operated transmissive WLDs and comparison of heat dissipation ability of QDs-LC and QDs-RAPE. (d) SEM image and schematic of molecular chains of UPEF.
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Figure 2.
(a) Photograh of QDs-RAPE. (b) Partial enlarged image of QDs-RAPE under optical microscope. (c−g) SEM images of QDs-RAPE under different magnifications. (h−i) SEM images of QDs-RAPE after removing UPEF under different magnifications. (j) SEM image and corresponding EDS mapping images of QDs-RAPE.
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Figure 3.
(a) UV-VIS absorption spectra and (b) photoluminescence spectra of QDs-silicone, phosphor-silicone, QDs-LC and QDs-RAPE, respectively. (c) TRPL decay curves of QDs in chloroform, silicone and silicone with radially aligned UPEF, respectively.
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Figure 4.
Through-plane TC, in-plane TC and anisotropic degree of TC of RA-PE with different UPEF volume ratio, respectively.
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Figure 5.
Simulated temperature and heat flux distribution of (a) QDs-LC and (b) QDs-RAPE.
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Figure 6.
Surface temperature distributions of the three samples under driving currents of (a) 700 mA and (b) 1000 mA. (c) Temperature measurement setup. (d) Maximum surface temperature of the samples under different driving currents.
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Figure 7.
(a) Spectral power distributions and optical properties of QDs-LC, 8.15 vol% and 21.92 vol% QDs-RAPE under driving current of 700 mA. Inset is the photograph of QDs-RAPE with illumination. (b) Spectral power distribution and optical properties of 21.92 vol% QDs-RAPE under driving current of 1500 mA. (c) The coordinates of the luminescent composites in the CIE 1931 diagram. (d) LE, (e) CRI and (f) CCT of QDs-RAPE (8.15, 11.93, 17.70, 21.92 and 26.70 vol%) and QDs-LC under different driving currents from 300 to 1500 mA.
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Figure 8.
Enhancement ratios of (a) yellow- and (b) red- light intensity of QDs-RAPE to QDs-LC under different driving currents.
