Vanadium dioxide-1, 4-bis(benzoxazol-2-yl)naphthalene composite films and their thermochromic and photoluminescent property
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摘要: 二氧化钒(VO2)是一种较理想的可用于调节室内温度的热致变色智能玻璃材料。然而,VO2基智能玻璃涂层的应用一直受到其固有的令人不易接受的棕黄色等问题的限制。本文用1, 4-双(苯并噁唑-2-基)萘(KCB)与掺钨二氧化钒纳米颗粒制备了双层结构VO2-KCB复合薄膜,其中有机荧光分子KCB层吸收太阳光中的紫外线,发出蓝绿色荧光,使复合薄膜在太阳光下呈现浅蓝色或蓝绿色,以改善VO2薄膜固有的棕黄色。复合薄膜具有9%以上的太阳光调制能力ΔTsol,可见光透过率Tlum大于73%,且具有较好防紫外性能。这些性能将非常有利于进一步拓展VO2基智能玻璃涂层的实际应用。Abstract: Vanadium dioxide (VO2) is an ideal thermochromic material for smart window which can be used to adjust the indoor temperature in summer. However, the application of the VO2-based smart window coatings is practically restricted by several problems such as the inherently unpleasant brown-yellow color. In this work, the VO2-organic fluorescent molecule bilayer composite films were fabricated by using 1, 4-bis(benzoxazol-2-yl)naphthalene (KCB) and W-doped VO2 nanoparticles. After absorbing the ultraviolet light from sunlight, the KCB layer emits cyan fluorescence to make the composite film light blue or cyan in color, successfully modifying the brown-yellow color of the pure VO2 films on glass. The composite films have the solar regulation efficiency ΔTsol of greater than 9% and the luminous transmittance Tlum higher than 73%, and good anti-ultraviolet property as well. These features should be highly beneficial for the practical application of the VO2-based films for smart windows.
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Key words:
- vanadium dioxide /
- composite film /
- thermochromic /
- fluorescence /
- smart window
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表 1 本文复合薄膜的名称及组成
Table 1. Composite films and their composition
Sample VO2/g KCB/g Polyvinyl butyral (PVB)/g Ethanol/mL Methylene chloride/mL VO2 0.05 - 1 10 - KCB2 - 0.02 1 - 10 KCB5 - 0.05 1 - 10 KCB7 - 0.07 1 - 10 表 2 VO2、VO2-KCB复合薄膜的可见光透过率、太阳光透过率和太阳调节效率汇总
Table 2. Summary of the luminous transmittance, solar transmittance and solar regulation efficiency for VO2 and VO2-KCB composite films
Film Tlum/% Tsol/% ΔTsol/% 20℃ 90℃ 20℃ 90℃ VO2 73.31 74.80 81.57 72.60 8.97 VO2-KCB2 75.46 75.54 82.97 73.29 9.68 VO2-KCB5 73.24 73.13 78.91 69.10 9.81 VO2-KCB7 72.48 74.03 78.70 68.55 10.15 Notes: Tsol—Solar transmittance, Tlum—Luminous transmittance; ΔTsol—Solar regulation efficiency, which were calculated from the equation (1). -
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