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| Autori principali: | , , , , , |
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| Natura: | Artículo Open Access |
| Pubblicazione: |
Wiley
2025
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| Soggetti: | |
| Accesso online: | https://4spepublications.onlinelibrary.wiley.com/doi/10.1002/pc.70751 |
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Sommario:
- Flow ‐Induced Microstructure Manipulation for Thermal‐Humid Performance Enhancement in Quantum Dots Luminescent Composite Xuan Yang Tianxu Zhang Changcong Wang Linyi Xiang Bin Xie Xiaobing Luo Polymer Composites ABSTRACT Quantum dots (QDs) are widely used in optoelectronic devices due to their excellent optical properties. However, their photoluminescent characteristics are highly sensitive to temperature and humidity, impacting the performance and reliability of QD‐based devices. Traditional strategies typically address either heat dissipation or moisture resistance but fail to handle both high temperature and humidity simultaneously. To improve thermal‐humid stability, we proposed integrating horizontally oriented hexagonal boron nitride (hBN) microstructures into QDs composites. This design enhances in‐plane thermal conductivity and reduces through‐plane water vapor diffusivity, as confirmed by effective medium theory. We developed a flow‐induced method using fluid shear force during spin coating to achieve the horizontal alignment of hBN. The fabricated transmissive white light laser diodes (WLDs), termed LC/HhBN WLDs, demonstrated superior optical and thermal performance. Under a driving current of 500 mA, LC/HhBN with 5 wt% hBN exhibited a maximum surface temperature 54°C lower than conventional LC WLDs. Additionally, the luminous efficiency of LC/HhBN was 131.34 lm W −1 , surpassing LC's 124.76 lm W −1 . In a 600‐h aging test at 60°C and 90% relative humidity, QDs‐silicone/HhBN with 5 wt% hBN retained 82% of its initial light intensity, compared to only 65% for QDs‐silicone. 10.1002/pc.70751 http://onlinelibrary.wiley.com/termsAndConditions#vor